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Available in 18 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-18" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">18 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-ca mw-list-item"><a href="https://ca.wikipedia.org/wiki/HFS_(Apple)" title="HFS (Apple) – Catalan" lang="ca" hreflang="ca" data-title="HFS (Apple)" data-language-autonym="Català" data-language-local-name="Catalan" class="interlanguage-link-target"><span>Català</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/HFS_(Dateisystem)" title="HFS (Dateisystem) – German" lang="de" hreflang="de" data-title="HFS (Dateisystem)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-es mw-list-item"><a href="https://es.wikipedia.org/wiki/Hierarchical_File_System" title="Hierarchical File System – Spanish" lang="es" hreflang="es" data-title="Hierarchical File System" data-language-autonym="Español" data-language-local-name="Spanish" class="interlanguage-link-target"><span>Español</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Hierarchical_File_System" title="Hierarchical File System – French" lang="fr" hreflang="fr" data-title="Hierarchical File System" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-gl mw-list-item"><a href="https://gl.wikipedia.org/wiki/HFS" title="HFS – Galician" lang="gl" hreflang="gl" data-title="HFS" data-language-autonym="Galego" data-language-local-name="Galician" class="interlanguage-link-target"><span>Galego</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/%EA%B3%84%EC%B8%B5%EC%A0%81_%ED%8C%8C%EC%9D%BC_%EC%8B%9C%EC%8A%A4%ED%85%9C" title="계층적 파일 시스템 – Korean" lang="ko" hreflang="ko" data-title="계층적 파일 시스템" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Hierarchical_File_System" title="Hierarchical File System – Italian" lang="it" hreflang="it" data-title="Hierarchical File System" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-lt mw-list-item"><a href="https://lt.wikipedia.org/wiki/HFS" title="HFS – Lithuanian" lang="lt" hreflang="lt" data-title="HFS" data-language-autonym="Lietuvių" data-language-local-name="Lithuanian" class="interlanguage-link-target"><span>Lietuvių</span></a></li><li class="interlanguage-link interwiki-nl mw-list-item"><a href="https://nl.wikipedia.org/wiki/Hierarchical_File_System" title="Hierarchical File System – Dutch" lang="nl" hreflang="nl" data-title="Hierarchical File System" data-language-autonym="Nederlands" data-language-local-name="Dutch" class="interlanguage-link-target"><span>Nederlands</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Hierarchical_File_System" title="Hierarchical File System – Japanese" lang="ja" hreflang="ja" data-title="Hierarchical File System" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-no mw-list-item"><a href="https://no.wikipedia.org/wiki/Hierarchical_File_System_(Apple_Macintosh)" title="Hierarchical File System (Apple Macintosh) – Norwegian Bokmål" lang="nb" hreflang="nb" data-title="Hierarchical File System (Apple Macintosh)" data-language-autonym="Norsk bokmål" data-language-local-name="Norwegian Bokmål" class="interlanguage-link-target"><span>Norsk bokmål</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Hierarchical_File_System" title="Hierarchical File System – Polish" lang="pl" hreflang="pl" data-title="Hierarchical File System" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-pt mw-list-item"><a href="https://pt.wikipedia.org/wiki/Hierarchical_File_System" title="Hierarchical File System – Portuguese" lang="pt" hreflang="pt" data-title="Hierarchical File System" data-language-autonym="Português" data-language-local-name="Portuguese" class="interlanguage-link-target"><span>Português</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/HFS" title="HFS – Russian" lang="ru" hreflang="ru" data-title="HFS" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-fi mw-list-item"><a href="https://fi.wikipedia.org/wiki/Hierarchical_File_System" title="Hierarchical File System – Finnish" lang="fi" hreflang="fi" data-title="Hierarchical File System" data-language-autonym="Suomi" data-language-local-name="Finnish" class="interlanguage-link-target"><span>Suomi</span></a></li><li class="interlanguage-link interwiki-sv mw-list-item"><a href="https://sv.wikipedia.org/wiki/HFS" title="HFS – Swedish" lang="sv" hreflang="sv" data-title="HFS" data-language-autonym="Svenska" data-language-local-name="Swedish" class="interlanguage-link-target"><span>Svenska</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/HFS" title="HFS – Ukrainian" lang="uk" hreflang="uk" data-title="HFS" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/%E5%88%86%E5%B1%82%E6%96%87%E4%BB%B6%E7%B3%BB%E7%BB%9F" title="分层文件系统 – Chinese" lang="zh" hreflang="zh" data-title="分层文件系统" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit 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free encyclopedia</div> </div> <div id="contentSub"><div id="mw-content-subtitle"></div></div> <div id="mw-content-text" class="mw-body-content"><div class="mw-content-ltr mw-parser-output" lang="en" dir="ltr"><div class="shortdescription nomobile noexcerpt noprint searchaux" style="display:none">Proprietary file system by Apple</div> <style data-mw-deduplicate="TemplateStyles:r1236090951">.mw-parser-output .hatnote{font-style:italic}.mw-parser-output div.hatnote{padding-left:1.6em;margin-bottom:0.5em}.mw-parser-output .hatnote i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about the Apple file system used prior to Mac OS X 10.6. For the general concept, see <a href="/wiki/Hierarchical_file_system" title="Hierarchical file system">Hierarchical file system</a>. For the IBM file system with the same name, see <a href="/wiki/Hierarchical_File_System_(IBM_MVS)" title="Hierarchical File System (IBM MVS)">Hierarchical File System (IBM MVS)</a>.</div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951"><div role="note" class="hatnote navigation-not-searchable">Not to be confused with <a href="/wiki/Filesystem_Hierarchy_Standard" title="Filesystem Hierarchy Standard">Filesystem Hierarchy Standard</a>.</div> <style data-mw-deduplicate="TemplateStyles:r1251242444">.mw-parser-output .ambox{border:1px solid #a2a9b1;border-left:10px solid #36c;background-color:#fbfbfb;box-sizing:border-box}.mw-parser-output .ambox+link+.ambox,.mw-parser-output .ambox+link+style+.ambox,.mw-parser-output .ambox+link+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+style+.ambox,.mw-parser-output .ambox+.mw-empty-elt+link+link+.ambox{margin-top:-1px}html body.mediawiki .mw-parser-output .ambox.mbox-small-left{margin:4px 1em 4px 0;overflow:hidden;width:238px;border-collapse:collapse;font-size:88%;line-height:1.25em}.mw-parser-output .ambox-speedy{border-left:10px solid #b32424;background-color:#fee7e6}.mw-parser-output .ambox-delete{border-left:10px solid #b32424}.mw-parser-output .ambox-content{border-left:10px solid #f28500}.mw-parser-output .ambox-style{border-left:10px solid #fc3}.mw-parser-output .ambox-move{border-left:10px solid #9932cc}.mw-parser-output .ambox-protection{border-left:10px solid #a2a9b1}.mw-parser-output .ambox .mbox-text{border:none;padding:0.25em 0.5em;width:100%}.mw-parser-output .ambox .mbox-image{border:none;padding:2px 0 2px 0.5em;text-align:center}.mw-parser-output .ambox .mbox-imageright{border:none;padding:2px 0.5em 2px 0;text-align:center}.mw-parser-output .ambox .mbox-empty-cell{border:none;padding:0;width:1px}.mw-parser-output .ambox .mbox-image-div{width:52px}@media(min-width:720px){.mw-parser-output .ambox{margin:0 10%}}@media print{body.ns-0 .mw-parser-output .ambox{display:none!important}}</style><table class="box-More_citations_needed plainlinks metadata ambox ambox-content ambox-Refimprove" role="presentation"><tbody><tr><td class="mbox-image"><div class="mbox-image-div"><span typeof="mw:File"><a href="/wiki/File:Question_book-new.svg" class="mw-file-description"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/50px-Question_book-new.svg.png" decoding="async" width="50" height="39" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/75px-Question_book-new.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/99/Question_book-new.svg/100px-Question_book-new.svg.png 2x" data-file-width="512" data-file-height="399" /></a></span></div></td><td class="mbox-text"><div class="mbox-text-span">This article <b>needs additional citations for <a href="/wiki/Wikipedia:Verifiability" title="Wikipedia:Verifiability">verification</a></b>.<span class="hide-when-compact"> Please help <a href="/wiki/Special:EditPage/Hierarchical_File_System_(Apple)" title="Special:EditPage/Hierarchical File System (Apple)">improve this article</a> by <a href="/wiki/Help:Referencing_for_beginners" title="Help:Referencing for beginners">adding citations to reliable sources</a>. Unsourced material may be challenged and removed.<br /><small><span class="plainlinks"><i>Find sources:</i> <a rel="nofollow" class="external text" href="https://www.google.com/search?as_eq=wikipedia&q=%22Hierarchical+File+System%22+Apple">"Hierarchical File System" Apple</a> – <a rel="nofollow" class="external text" href="https://www.google.com/search?tbm=nws&q=%22Hierarchical+File+System%22+Apple+-wikipedia&tbs=ar:1">news</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?&q=%22Hierarchical+File+System%22+Apple&tbs=bkt:s&tbm=bks">newspapers</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.google.com/search?tbs=bks:1&q=%22Hierarchical+File+System%22+Apple+-wikipedia">books</a> <b>·</b> <a rel="nofollow" class="external text" href="https://scholar.google.com/scholar?q=%22Hierarchical+File+System%22+Apple">scholar</a> <b>·</b> <a rel="nofollow" class="external text" href="https://www.jstor.org/action/doBasicSearch?Query=%22Hierarchical+File+System%22+Apple&acc=on&wc=on">JSTOR</a></span></small></span> <span class="date-container"><i>(<span class="date">July 2020</span>)</i></span><span class="hide-when-compact"><i> (<small><a href="/wiki/Help:Maintenance_template_removal" title="Help:Maintenance template removal">Learn how and when to remove this message</a></small>)</i></span></div></td></tr></tbody></table> <style data-mw-deduplicate="TemplateStyles:r1257001546">.mw-parser-output .infobox-subbox{padding:0;border:none;margin:-3px;width:auto;min-width:100%;font-size:100%;clear:none;float:none;background-color:transparent}.mw-parser-output .infobox-3cols-child{margin:auto}.mw-parser-output .infobox .navbar{font-size:100%}@media screen{html.skin-theme-clientpref-night .mw-parser-output .infobox-full-data:not(.notheme)>div:not(.notheme)[style]{background:#1f1f23!important;color:#f8f9fa}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .infobox-full-data:not(.notheme) div:not(.notheme){background:#1f1f23!important;color:#f8f9fa}}@media(min-width:640px){body.skin--responsive .mw-parser-output .infobox-table{display:table!important}body.skin--responsive .mw-parser-output .infobox-table>caption{display:table-caption!important}body.skin--responsive .mw-parser-output .infobox-table>tbody{display:table-row-group}body.skin--responsive .mw-parser-output .infobox-table tr{display:table-row!important}body.skin--responsive .mw-parser-output .infobox-table th,body.skin--responsive .mw-parser-output .infobox-table td{padding-left:inherit;padding-right:inherit}}</style><table class="infobox vevent"><caption class="infobox-title summary">HFS</caption><tbody><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_developer" class="mw-redirect" title="Software developer">Developer(s)</a></th><td class="infobox-data"><a href="/wiki/Apple_Computer" class="mw-redirect" title="Apple Computer">Apple Computer</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Full name</th><td class="infobox-data">Hierarchical File System</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Introduced</th><td class="infobox-data">September 17, 1985<span class="noprint">; 39 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1985-09-17</span>)</span> with <a href="/wiki/Classic_Mac_OS#System_1,_2,_3_and_4" title="Classic Mac OS">System 2.1</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Preceded by</th><td class="infobox-data"><a href="/wiki/Macintosh_File_System" title="Macintosh File System">MFS</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Succeeded by</th><td class="infobox-data"><a href="/wiki/HFS_Plus" title="HFS Plus">HFS Plus</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Partition_type" title="Partition type">Partition IDs</a></th><td class="infobox-data"><code>Apple_HFS</code> (<a href="/wiki/Apple_Partition_Map" title="Apple Partition Map">Apple Partition Map</a>)<br /><code>0xAF</code> (<a href="/wiki/Master_Boot_Record" class="mw-redirect" title="Master Boot Record">MBR</a>) <i>HFS and HFS+</i></td></tr><tr><th colspan="2" class="infobox-header">Structures</th></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Directory contents</th><td class="infobox-data"><a href="/wiki/B-tree" title="B-tree">B-tree</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">File allocation</th><td class="infobox-data"><a href="/wiki/Free_space_bitmap" class="mw-redirect" title="Free space bitmap">Bitmap</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Bad blocks</th><td class="infobox-data"><a href="/wiki/B-tree" title="B-tree">B-tree</a></td></tr><tr><th colspan="2" class="infobox-header">Limits</th></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Max volume size</th><td class="infobox-data">2 <a href="/wiki/Terabyte" class="mw-redirect" title="Terabyte">TB</a> (<span class="nowrap">2 × 1024<sup>4</sup> bytes</span>)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Max file size</th><td class="infobox-data">2 <a href="/wiki/Gigabyte" title="Gigabyte">GB</a> (<span class="nowrap">2 × 1024<sup>3</sup> bytes</span>)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Max <abbr title="number">no.</abbr> of files</th><td class="infobox-data">65535</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Max filename length</th><td class="infobox-data">31 characters</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Allowed filename<br />characters</th><td class="infobox-data">All 8-bit values except <style data-mw-deduplicate="TemplateStyles:r886049734">.mw-parser-output .monospaced{font-family:monospace,monospace}</style><span class="monospaced">:</span>. Discouraged <a href="/wiki/Null_character" title="Null character">null</a> and non-printing characters.</td></tr><tr><th colspan="2" class="infobox-header">Features</th></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Dates recorded</th><td class="infobox-data">Creation, modification, backup</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Date range</th><td class="infobox-data">January 1, 1904 – February 6, 2040</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Date resolution</th><td class="infobox-data">1s</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Fork_(file_system)" title="Fork (file system)">Forks</a></th><td class="infobox-data">Only 2 (<a href="/wiki/Data_fork" class="mw-redirect" title="Data fork">data</a> and <a href="/wiki/Resource_fork" title="Resource fork">resource</a>)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Attributes</th><td class="infobox-data">Color (3 bits, all other flags 1 bit), locked, custom icon, bundle, invisible, alias, system, stationery, inited, no INIT resources, shared, desktop</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/File_system_permissions" class="mw-redirect" title="File system permissions">File system<br />permissions</a></th><td class="infobox-data">AppleShare</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Transparent<br />compression</th><td class="infobox-data">Yes (third-party); <a href="/wiki/Stac_Electronics" title="Stac Electronics">Stacker</a>, <a href="/wiki/AutoDoubler" class="mw-redirect" title="AutoDoubler">AutoDoubler</a>, TimesTwo, <a href="/wiki/Now_Software" title="Now Software">Now Compress</a>, <a href="/wiki/StuffIt" title="StuffIt">StuffIt</a> SpaceSaver, Alysis Software products (SuperDisk!, More Disk Space, The Alysis Disk Expander and eDisk), AutoSqueeze</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Filesystem-level_encryption" title="Filesystem-level encryption">Transparent<br />encryption</a></th><td class="infobox-data">No</td></tr><tr><th colspan="2" class="infobox-header">Other</th></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Supported<br /><a href="/wiki/Operating_system" title="Operating system">operating systems</a></th><td class="infobox-data"><a href="/wiki/Classic_Mac_OS" title="Classic Mac OS">Classic Mac OS</a>, <a href="/wiki/MacOS" title="MacOS">macOS</a>, <a href="/wiki/GS/OS" class="mw-redirect" title="GS/OS">GS/OS</a>, <a href="/wiki/Linux" title="Linux">Linux</a>, <a href="/wiki/Microsoft_Windows" title="Microsoft Windows">Microsoft Windows</a> (through MacDrive or <a href="/wiki/Boot_Camp_(software)" title="Boot Camp (software)">Boot Camp</a><a href="/wiki/Installable_File_System" title="Installable File System">IFS</a> drivers)<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (December 2010)">citation needed</span></a></i>]</sup></td></tr></tbody></table> <p><b>Hierarchical File System</b> (<b>HFS</b>) is a <a href="/wiki/Proprietary_software" title="Proprietary software">proprietary</a> <a href="/wiki/File_system" title="File system">file system</a> developed by <a href="/wiki/Apple_Inc." title="Apple Inc.">Apple Inc.</a> for use in computer systems running <a href="/wiki/Classic_Mac_OS" title="Classic Mac OS">Mac OS</a>. Originally designed for use on <a href="/wiki/Floppy_disk" title="Floppy disk">floppy</a> and <a href="/wiki/Hard_disk" class="mw-redirect" title="Hard disk">hard disks</a>, it can also be found on read-only media such as <a href="/wiki/CD-ROM" title="CD-ROM">CD-ROMs</a>. HFS is also referred to as <b>Mac OS Standard</b> (or <b>HFS Standard</b>), while its successor, <a href="/wiki/HFS_Plus" title="HFS Plus">HFS Plus</a>, is also called Mac OS Extended (or HFS Extended). </p><p>With the introduction of <a href="/wiki/Mac_OS_X_10.6" class="mw-redirect" title="Mac OS X 10.6">Mac OS X 10.6</a>, Apple dropped support for formatting or writing HFS disks and <a href="/wiki/Disk_image" title="Disk image">images</a>, which remained supported as <a href="/wiki/File_system_permissions#Permissions" class="mw-redirect" title="File system permissions">read-only</a> volumes until <a href="/wiki/MacOS_10.15" class="mw-redirect" title="MacOS 10.15">macOS 10.15</a>.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> Starting with macOS 10.15, HFS disks can no longer be read. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="History">History</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hierarchical_File_System_(Apple)&action=edit&section=1" title="Edit section: History"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>Apple introduced HFS in September 1985, specifically to support Apple's first <a href="/wiki/Hard_Disk_20" title="Hard Disk 20">hard disk drive</a> for the Macintosh, replacing the <a href="/wiki/Macintosh_File_System" title="Macintosh File System">Macintosh File System</a> (MFS), the original file system which had been introduced over a year and a half earlier with the first <a href="/wiki/Macintosh_128K" title="Macintosh 128K">Macintosh</a> computer. HFS drew heavily upon Apple's first operating system with a <a href="/wiki/Hierarchical_file_system" title="Hierarchical file system">hierarchical file system</a>, <a href="/wiki/Apple_SOS" title="Apple SOS">SOS</a> for the failed <a href="/wiki/Apple_III" title="Apple III">Apple III</a>, which also served as the basis for hierarchical file systems on the <a href="/wiki/Apple_IIe" title="Apple IIe">Apple IIe</a> and <a href="/wiki/Apple_Lisa" title="Apple Lisa">Apple Lisa</a>. HFS was developed by Patrick Dirks and Bill Bruffey. It shared a number of design features with MFS that were not available in other file systems of the time (such as <a href="/wiki/DOS" title="DOS">DOS</a>'s <a href="/wiki/File_Allocation_Table" title="File Allocation Table">FAT</a>). Files could have multiple forks (normally a data and a <a href="/wiki/Resource_fork" title="Resource fork">resource fork</a>), which allowed the main data of the file to be stored separately from resources such as icons that might need to be localized. Files were referenced with unique file IDs rather than file names, and file names could be up to 31 characters long. </p><p>However, MFS had been optimized to be used on very small and slow media, namely <a href="/wiki/Floppy_disk" title="Floppy disk">floppy disks</a>, so HFS was introduced to overcome some of the performance problems that arrived with the introduction of larger media, notably <a href="/wiki/Hard_drive" class="mw-redirect" title="Hard drive">hard drives</a>. The main concern was the time needed to display the contents of a folder. Under MFS all of the file and directory listing information was stored in a single file, which the system had to search to build a list of the files stored in a particular folder. This worked well with a system with a few hundred kilobytes of storage and perhaps a hundred files, but as the systems grew into megabytes and thousands of files, the performance degraded rapidly. </p><p>The solution was to replace MFS's directory structure with one more suitable to larger file systems. HFS replaced the flat table structure with the <i>Catalog File</i> which uses a <a href="/wiki/B-tree" title="B-tree">B-tree</a> structure that could be searched very quickly regardless of size.<sup id="cite_ref-primer_2-0" class="reference"><a href="#cite_note-primer-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> HFS also redesigned various structures to be able to hold larger numbers, 16-bit integers being replaced by 32-bit almost universally. Oddly, one of the few places this "upsizing" did not take place was the file directory itself, which limits HFS to a total of 65,535 files on each logical disk. </p><p>While HFS is a proprietary file system format, it is well-documented; there are usually solutions available to access HFS-formatted disks from most modern <a href="/wiki/Operating_system" title="Operating system">operating systems</a>. </p><p>Apple introduced HFS out of necessity with its first 20 MB <a href="/wiki/Hard_Disk_20" title="Hard Disk 20">hard disk</a> offering for the Macintosh in September 1985, where it was loaded into RAM from a MFS floppy disk on boot using a patch file ("Hard Disk 20"). However, HFS was not widely introduced until it was included in the 128K <a href="/wiki/Read-only_memory" title="Read-only memory">ROM</a> that debuted with the <a href="/wiki/Macintosh_Plus" title="Macintosh Plus">Macintosh Plus</a> in January 1986 along with the larger 800 KB floppy disk drive for the Macintosh that also used HFS. The introduction of HFS was the first advancement by Apple to leave a Macintosh computer model behind: the original <a href="/wiki/Macintosh_128K" title="Macintosh 128K">128K Macintosh</a>, which lacked sufficient memory to load the HFS code and was promptly discontinued. </p><p>In 1998, Apple introduced <a href="/wiki/HFS_Plus" title="HFS Plus">HFS Plus</a> to address inefficient allocation of disk space in HFS and to add other improvements. HFS Plus is still supported by current versions of Mac OS, but starting with <a href="/wiki/Mac_OS_X" class="mw-redirect" title="Mac OS X">Mac OS X</a>, an HFS volume cannot be used for <a href="/wiki/Booting" title="Booting">booting</a>, and beginning with <a href="/wiki/Mac_OS_X_10.6" class="mw-redirect" title="Mac OS X 10.6">Mac OS X 10.6</a> (Snow Leopard), HFS volumes are read-only and cannot be created or updated. In <a href="/wiki/MacOS_Sierra" title="MacOS Sierra">macOS Sierra</a> (10.12), Apple's release notes state that "The HFS Standard filesystem is no longer supported."<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> However, read-only HFS Standard support continued to work until the release of <a href="/wiki/MacOS_10.15" class="mw-redirect" title="MacOS 10.15">macOS 10.15</a>,<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> ending official support for classic HFS Standard after 35 years.<sup id="cite_ref-5" class="reference"><a href="#cite_note-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="Design">Design</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hierarchical_File_System_(Apple)&action=edit&section=2" title="Edit section: Design"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A storage volume is inherently divided into <i>logical blocks</i> of 512 bytes. The Hierarchical File System groups these logical blocks into <i>allocation blocks</i>, which can contain one or more logical blocks, depending on the total size of the volume. HFS uses a 16-bit value to address allocation blocks, limiting the number of allocation blocks to 65,535 (2<sup>16</sup>-1). </p><p>Five structures make up an HFS volume: </p> <ol><li>Logical blocks 0 and 1 of the volume are the <b><a href="/wiki/Boot_sector" title="Boot sector">Boot Blocks</a></b>, which contain system startup information.<sup id="cite_ref-primer_2-1" class="reference"><a href="#cite_note-primer-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> For example, the names of the System and Shell (usually the <a href="/wiki/Macintosh_Finder" class="mw-redirect" title="Macintosh Finder">Finder</a>) files which are loaded at startup.</li> <li>Logical block 2 contains the <b>Master Directory Block</b> (also known as <b>MDB</b>). This defines a wide variety of data about the volume itself, for example date & time stamps for when the volume was created, the location of the other volume structures such as the Volume Bitmap or the size of logical structures such as allocation blocks. There is also a duplicate of the MDB called the <b>Alternate Master Directory Block</b> (also known as <b>Alternate MDB</b>) located at the opposite end of the volume in the second to last logical block. This is intended mainly for use by disk utilities and is only updated when either the Catalog File or Extents Overflow File grow in size.</li> <li>Logical block 3 is the starting block of the <b>Volume Bitmap</b>, which keeps track of which allocation blocks are in use and which are free. Each allocation block on the volume is represented by a bit in the map: if the bit is set then the block is in use; if it is clear then the block is free to be used. Since the Volume Bitmap must have a bit to represent each allocation block, its size is determined by the size of the volume itself.<sup id="cite_ref-primer_2-2" class="reference"><a href="#cite_note-primer-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup></li> <li>The <b>Extent Overflow File</b> is a <a href="/wiki/B-tree" title="B-tree">B-tree</a> that contains extra extents that record which allocation blocks are allocated to which files, once the initial three extents in the Catalog File are used up. Later versions also added the ability for the Extent Overflow File to store extents that record bad blocks, to prevent the file system from trying to allocate a bad block to a file.</li> <li>The <b>Catalog File</b> is another <a href="/wiki/B-tree" title="B-tree">B-tree</a> that contains records for all the files and directories stored in the volume. It stores four types of records. Each file consists of a File Thread Record and a File Record while each directory consists of a Directory Thread Record and a Directory Record. Files and directories in the Catalog File are located by their unique <b>Catalog Node ID</b> (or <b>CNID</b>). <ul><li>A <b>File Thread Record</b> stores just the name of the file and the CNID of its parent directory.</li> <li>A <b>File Record</b> stores a variety of metadata about the file including its CNID, the size of the file, three timestamps (when the file was created, last modified, last backed up), the first <a href="/wiki/File_extent" class="mw-redirect" title="File extent">file extents</a> of the data and resource forks and pointers to the file's first data and resource extent records in the Extent Overflow File. The File Record also stores two 16 byte fields that are used by the Finder to store attributes about the file including things like its <a href="/wiki/Creator_code" title="Creator code">creator code</a>, <a href="/wiki/Type_code" class="mw-redirect" title="Type code">type code</a>, the window the file should appear in and its location within the window.</li> <li>A <b>Directory Thread Record</b> stores just the name of the directory and the CNID of its parent directory.</li> <li>A <b>Directory Record</b> which stores data like the number of files stored within the directory, the CNID of the directory, three timestamps (when the directory was created, last modified, last backed up). Like the File Record, the Directory Record also stores two 16 byte fields for use by the Finder. These store things like the width & height and x & y co-ordinates for the window used to display the contents of the directory, the display mode (icon view, list view, etc.) of the window and the position of the window's scroll bar.</li></ul></li></ol> <div class="mw-heading mw-heading2"><h2 id="Limitations">Limitations</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hierarchical_File_System_(Apple)&action=edit&section=3" title="Edit section: Limitations"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Catalog File, which stores all the file and directory records in a single data structure, results in performance problems when the system allows <a href="/wiki/Computer_multitasking" title="Computer multitasking">multitasking</a>, as only one program can write to this structure at a time, meaning that many programs may be waiting in queue due to one program "hogging" the system.<sup id="cite_ref-6" class="reference"><a href="#cite_note-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> It is also a serious reliability concern, as damage to this file can destroy the entire file system. This contrasts with other file systems that store file and directory records in separate structures (such as DOS's FAT file system or the <a href="/wiki/Unix_File_System" title="Unix File System">Unix File System</a>), where having structure distributed across the disk means that damaging a single directory is generally non-fatal and the data may possibly be re-constructed with data held in the non-damaged portions. </p><p>Additionally, the limit of 65,535 allocation blocks resulted in files having a "minimum" size equivalent 1/65,535th the size of the disk. Thus, any given volume, no matter its size, could only store a maximum of 65,535 files. Moreover, any file would be allocated more space than it actually needed, up to the allocation block size. When disks were small, this was of little consequence, because the individual allocation block size was trivial, but as disks started to approach the 1 GB mark, the smallest amount of space that any file could occupy (a single allocation block) became excessively large, wasting significant amounts of disk space. For example, on a 1 GB disk, the allocation block size under HFS is 16 KB, so even a 1 byte file would take up 16 KB of disk space. This situation was less of a problem for users having large files (such as pictures, databases or audio) because these larger files wasted less space as a percentage of their file size. Users with many small files, on the other hand, could lose a copious amount of space due to large allocation block size. This made partitioning disks into smaller logical volumes very appealing for Mac users, because small documents stored on a smaller volume would take up much less space than if they resided on a large partition. The same problem existed in the FAT16 file system. </p><p>HFS saves the case of a file that is created or renamed but is case-insensitive in operation. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hierarchical_File_System_(Apple)&action=edit&section=4" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Comparison_of_file_systems" title="Comparison of file systems">Comparison of file systems</a></li> <li><a href="/wiki/APFS" class="mw-redirect" title="APFS">APFS</a></li> <li><a href="/wiki/HFS_Plus" title="HFS Plus">HFS Plus</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hierarchical_File_System_(Apple)&action=edit&section=5" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFGagne2009" class="citation web cs1">Gagne, Ken (2009-08-31). <a rel="nofollow" class="external text" href="http://www.computerworld.com/article/2467506/mac-os-x/losing-legacy-data-to-snow-leopard.html">"Losing legacy data to Snow Leopard"</a>. Computerworld<span class="reference-accessdate">. Retrieved <span class="nowrap">2009-09-07</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Losing+legacy+data+to+Snow+Leopard&rft.pub=Computerworld&rft.date=2009-08-31&rft.aulast=Gagne&rft.aufirst=Ken&rft_id=http%3A%2F%2Fwww.computerworld.com%2Farticle%2F2467506%2Fmac-os-x%2Flosing-legacy-data-to-snow-leopard.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHierarchical+File+System+%28Apple%29" class="Z3988"></span></span> </li> <li id="cite_note-primer-2"><span class="mw-cite-backlink">^ <a href="#cite_ref-primer_2-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-primer_2-1"><sup><i><b>b</b></i></sup></a> <a href="#cite_ref-primer_2-2"><sup><i><b>c</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://web.archive.org/web/20191231011637/http://macjournals.com/%7Emwj/mwj_samples/MWJ_20030525.pdf">"The HFS Primer"</a> <span class="cs1-format">(PDF)</span>. <i>MWJ</i>. GCSF, Incorporated. 2003-05-25. Archived from <a rel="nofollow" class="external text" href="http://macjournals.com/~mwj/mwj_samples/MWJ_20030525.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2019-12-31.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=MWJ&rft.atitle=The+HFS+Primer&rft.date=2003-05-25&rft_id=http%3A%2F%2Fmacjournals.com%2F~mwj%2Fmwj_samples%2FMWJ_20030525.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHierarchical+File+System+%28Apple%29" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://developer.apple.com/library/prerelease/content/releasenotes/MacOSX/WhatsNewInOSX/Articles/OSXv10.html#//apple_ref/doc/uid/TP40017145-SW1">"What's New in macOS: macOS Sierra 10.12"</a>. Apple<span class="reference-accessdate">. Retrieved <span class="nowrap">25 January</span> 2017</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=What%27s+New+in+macOS%3A+macOS+Sierra+10.12&rft.pub=Apple&rft_id=https%3A%2F%2Fdeveloper.apple.com%2Flibrary%2Fprerelease%2Fcontent%2Freleasenotes%2FMacOSX%2FWhatsNewInOSX%2FArticles%2FOSXv10.html%23%2F%2Fapple_ref%2Fdoc%2Fuid%2FTP40017145-SW1&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHierarchical+File+System+%28Apple%29" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.matthewhughes.co.uk/how-to-mount-hfs-classic-drives-on-macos-catalina-and-later/">"How to mount HFS Classic drives on MacOS Catalina and later"</a>. Matthew Hughes. 25 July 2020<span class="reference-accessdate">. Retrieved <span class="nowrap">2 March</span> 2022</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=How+to+mount+HFS+Classic+drives+on+MacOS+Catalina+and+later&rft.pub=Matthew+Hughes&rft.date=2020-07-25&rft_id=https%3A%2F%2Fwww.matthewhughes.co.uk%2Fhow-to-mount-hfs-classic-drives-on-macos-catalina-and-later%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHierarchical+File+System+%28Apple%29" class="Z3988"></span></span> </li> <li id="cite_note-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-5">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://support.apple.com/en-us/HT212603">"About the security content of Security Update 2021-005 Mojave"</a>. <i>Apple Support</i>. 2022-06-21<span class="reference-accessdate">. Retrieved <span class="nowrap">2023-05-18</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Apple+Support&rft.atitle=About+the+security+content+of+Security+Update+2021-005+Mojave&rft.date=2022-06-21&rft_id=https%3A%2F%2Fsupport.apple.com%2Fen-us%2FHT212603&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHierarchical+File+System+%28Apple%29" class="Z3988"></span></span> </li> <li id="cite_note-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-6">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFGiampaolo1999" class="citation book cs1"><a href="/wiki/Dominic_Giampaolo" title="Dominic Giampaolo">Giampaolo, Dominic</a> (1999). <a rel="nofollow" class="external text" href="https://web.archive.org/web/20170213221835/http://www.nobius.org/~dbg/practical-file-system-design.pdf"><i>Practical File System Design with the Be File System</i></a> <span class="cs1-format">(PDF)</span>. Morgan Kaufmann. p. 37. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/1-55860-497-9" title="Special:BookSources/1-55860-497-9"><bdi>1-55860-497-9</bdi></a>. Archived from <a rel="nofollow" class="external text" href="http://www.nobius.org/~dbg/practical-file-system-design.pdf">the original</a> <span class="cs1-format">(PDF)</span> on 2017-02-13<span class="reference-accessdate">. Retrieved <span class="nowrap">2006-07-13</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Practical+File+System+Design+with+the+Be+File+System&rft.pages=37&rft.pub=Morgan+Kaufmann&rft.date=1999&rft.isbn=1-55860-497-9&rft.aulast=Giampaolo&rft.aufirst=Dominic&rft_id=http%3A%2F%2Fwww.nobius.org%2F~dbg%2Fpractical-file-system-design.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AHierarchical+File+System+%28Apple%29" class="Z3988"></span></span> </li> </ol></div></div> <div class="mw-heading mw-heading2"><h2 id="External_links">External links</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Hierarchical_File_System_(Apple)&action=edit&section=6" title="Edit section: External links"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a rel="nofollow" class="external text" href="https://developer.apple.com/legacy/mac/library/documentation/mac/Files/Files-99.html">HFS specification</a> from developer.apple.com</li> <li><a rel="nofollow" class="external text" href="http://www.tldp.org/HOWTO/Filesystems-HOWTO-7.html#hfs">Filesystems HOWTO: HFS</a> - slightly out of date</li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20070927021136/http://mactech.com/articles/mactech/Vol.01/01.12/HFSFileStructure/">HFS File Structure Explained</a> - early description of HFS</li> <li><a rel="nofollow" class="external text" href="https://web.archive.org/web/20060511103200/http://www.alsoft.com/DiskWarrior/">DiskWarrior</a> - Software to eliminate all damage to the HFS disk directory</li> <li><a rel="nofollow" class="external text" href="http://www.mediafour.com/products/macdrive/">MacDrive</a> <a rel="nofollow" class="external text" href="https://web.archive.org/web/20101004143511/http://www.mediafour.com/products/macdrive/">Archived</a> 2010-10-04 at the <a href="/wiki/Wayback_Machine" title="Wayback Machine">Wayback Machine</a> - Software to read and write HFS/HFS Plus-formatted disks on <a href="/wiki/Microsoft_Windows" title="Microsoft Windows">Microsoft Windows</a></li> <li><a rel="nofollow" class="external text" href="http://www.mars.org/home/rob/proj/hfs/">hfsutils</a> - open-source software to manipulate HFS on Unix, DOS, Windows, OS/2</li></ul> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output .hlist dt,.mw-parser-output .hlist li{margin:0;display:inline}.mw-parser-output .hlist.inline,.mw-parser-output .hlist.inline dl,.mw-parser-output .hlist.inline ol,.mw-parser-output .hlist.inline ul,.mw-parser-output .hlist dl dl,.mw-parser-output .hlist dl ol,.mw-parser-output .hlist dl ul,.mw-parser-output .hlist ol dl,.mw-parser-output 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<li><a href="/wiki/Mac_OS_9" title="Mac OS 9">Mac OS 9</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Applications</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Calculator_(Apple)" title="Calculator (Apple)">Calculator</a></li> <li><a href="/wiki/Chooser_(Mac_OS)" title="Chooser (Mac OS)">Chooser</a></li> <li>Drive Setup</li> <li><a href="/wiki/DVD_Player_(macOS)" class="mw-redirect" title="DVD Player (macOS)">DVD Player</a></li> <li><a href="/wiki/Finder_(software)" title="Finder (software)">Finder</a></li> <li><a href="/wiki/NuCalc" title="NuCalc">Graphing Calculator</a></li> <li><a href="/wiki/Keychain_(software)" title="Keychain (software)">Keychain Access</a></li> <li><a href="/wiki/QuickTime" title="QuickTime">PictureViewer</a></li> <li><a href="/wiki/Apple_Open_Collaboration_Environment" title="Apple Open Collaboration Environment">PowerTalk</a></li> <li><a href="/wiki/QuickTime" title="QuickTime">QuickTime Player</a></li> <li><a href="/wiki/Network_Browser" title="Network Browser">Network Browser</a></li> <li><a href="/wiki/Scrapbook_(Mac_OS)" title="Scrapbook (Mac OS)">Scrapbook</a></li> <li><a href="/wiki/Sherlock_(software)" title="Sherlock (software)">Sherlock</a></li> <li><a href="/wiki/Apple_Software_Update" class="mw-redirect" title="Apple Software Update">Software Update</a></li> <li><a href="/wiki/Stickies_(Apple)" title="Stickies (Apple)">Stickies</a></li> <li><a href="/wiki/System_Information_(Mac)" class="mw-redirect" title="System Information (Mac)">System Information</a></li> <li><a href="/wiki/SimpleText" title="SimpleText">SimpleText</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Developer</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/HyperCard" title="HyperCard">HyperCard</a></li> <li><a href="/wiki/MacsBug" title="MacsBug">MacsBug</a></li> <li><a href="/wiki/Macintosh_Programmer%27s_Workshop" title="Macintosh Programmer's Workshop">Macintosh Programmer's Workshop</a></li> <li><a href="/wiki/ResEdit" title="ResEdit">ResEdit</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Technology</th><td class="navbox-list-with-group navbox-list navbox-even hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Alias_(Mac_OS)" title="Alias (Mac OS)">Alias</a></li> <li><a href="/wiki/Appearance_Manager" title="Appearance Manager">Appearance Manager</a></li> <li><a href="/wiki/Apple_menu" title="Apple menu">Apple menu</a></li> <li><a href="/wiki/At_Ease" title="At Ease">At Ease</a></li> <li><a href="/wiki/Balloon_help" title="Balloon help">Balloon help</a></li> <li><a href="/wiki/Bomb_(icon)" title="Bomb (icon)">Bomb error</a></li> <li><a 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href="/wiki/Manager_(Mac_OS)" title="Manager (Mac OS)">Managers</a></li> <li><a href="/wiki/MultiFinder" title="MultiFinder">MultiFinder</a></li> <li><a href="/wiki/Multiprocessing_Services" title="Multiprocessing Services">Multiprocessing Services</a></li> <li><a href="/wiki/Option_key" title="Option key">Option key (⌥)</a></li> <li><a href="/wiki/OSType" class="mw-redirect" title="OSType">OSType</a></li> <li><a href="/wiki/PICT" title="PICT">PICT</a></li> <li><a href="/wiki/QuickDraw" title="QuickDraw">QuickDraw</a></li> <li><a href="/wiki/QuickTime" title="QuickTime">QuickTime</a></li> <li><a href="/wiki/Resource_fork" title="Resource fork">Resource fork</a></li> <li><a href="/wiki/Sosumi" title="Sosumi">Sosumi sound</a></li> <li><a href="/wiki/Macintosh_startup" title="Macintosh startup">Startup sequence</a></li> <li><a href="/wiki/System_folder" title="System folder">System folder</a></li> <li><a href="/wiki/System_suitcase" title="System suitcase">System suitcase</a></li> <li><a href="/wiki/Type_code" class="mw-redirect" title="Type code">Type code</a></li> <li><a href="/wiki/WorldScript" title="WorldScript">WorldScript</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related articles</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Mac_OS_memory_management" class="mw-redirect" title="Mac OS memory management">Memory management</a></li> <li><a href="/wiki/Old_World_ROM" title="Old World ROM">Old World ROM</a></li> <li><a href="/wiki/New_World_ROM" title="New World ROM">New World ROM</a></li> <li><a href="/wiki/List_of_Classic_Mac_OS_software" title="List of Classic Mac OS software">Software</a></li></ul> </div></td></tr></tbody></table></div> <div class="navbox-styles"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236075235"></div><div role="navigation" class="navbox" aria-labelledby="File_systems" style="padding:3px"><table class="nowraplinks hlist mw-collapsible autocollapse navbox-inner" style="border-spacing:0;background:transparent;color:inherit"><tbody><tr><th scope="col" class="navbox-title" colspan="2"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1129693374"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239400231"><div class="navbar plainlinks hlist navbar-mini"><ul><li class="nv-view"><a href="/wiki/Template:File_systems" title="Template:File systems"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:File_systems" title="Template talk:File systems"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:File_systems" title="Special:EditPage/Template:File systems"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="File_systems" style="font-size:114%;margin:0 4em"><a href="/wiki/File_system" title="File system">File systems</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><a href="/wiki/Comparison_of_file_systems" title="Comparison of file systems">Comparison of file systems</a> <ul><li><a href="/wiki/Comparison_of_distributed_file_systems" title="Comparison of distributed file systems">distributed</a></li></ul></li> <li><a href="/wiki/Unix_filesystem" title="Unix filesystem">Unix filesystem</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Disk and<br />non-rotating</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Advanced_Disc_Filing_System" title="Advanced Disc Filing System">ADFS</a></li> <li><a href="/wiki/AdvFS" title="AdvFS">AdvFS</a></li> <li><a href="/wiki/Amiga_Fast_File_System" title="Amiga Fast File System">Amiga FFS</a></li> <li><a href="/wiki/Amiga_Old_File_System" title="Amiga Old File System">Amiga OFS</a></li> <li><a href="/wiki/Apple_File_System" title="Apple File System">APFS</a></li> <li><a href="/wiki/AtheOS_File_System" class="mw-redirect" title="AtheOS File System">AthFS</a></li> <li><a href="/wiki/Bcachefs" title="Bcachefs">bcachefs</a></li> <li>BFS <ul><li><a href="/wiki/Be_File_System" title="Be File System">Be File System</a></li> <li><a href="/wiki/Boot_File_System" title="Boot File System">Boot File System</a></li> <li>Byte File System (<a href="/wiki/Z/VM" title="Z/VM">z/VM</a>)</li></ul></li> <li><a href="/wiki/Btrfs" title="Btrfs">Btrfs</a></li> <li><a href="/wiki/StorNext_File_System" title="StorNext File System">CVFS</a></li> <li><a href="/wiki/CXFS" title="CXFS">CXFS</a></li> <li><a href="/wiki/Disc_Filing_System" title="Disc Filing System">DFS</a></li> <li>EFS <ul><li><a href="/wiki/Encrypting_File_System" title="Encrypting File System">Encrypting File System</a></li> <li><a href="/wiki/Extent_File_System" title="Extent File System">Extent File System</a></li></ul></li> <li><a href="/wiki/Episode_filesystem" title="Episode filesystem">Episode</a></li> <li><a href="/wiki/Extended_file_system" title="Extended file system">ext</a> <ul><li><a href="/wiki/Ext2" title="Ext2">ext2</a></li> <li><a href="/wiki/Ext3" title="Ext3">ext3</a></li> <li><a href="/wiki/Ext3cow" title="Ext3cow">ext3cow</a></li> <li><a href="/wiki/Ext4" title="Ext4">ext4</a></li></ul></li> <li><a href="/wiki/File_Allocation_Table" title="File Allocation Table">FAT</a> <ul><li><a href="/wiki/ExFAT" title="ExFAT">exFAT</a></li></ul></li> <li><a href="/wiki/Files-11" title="Files-11">Files-11</a></li> <li><a href="/wiki/Fossil_(file_system)" title="Fossil (file system)">Fossil</a></li> <li><a href="/wiki/GPFS" title="GPFS">GPFS</a></li> <li><a href="/wiki/HAMMER_(file_system)" title="HAMMER (file system)">HAMMER</a> <ul><li><a href="/wiki/HAMMER2" title="HAMMER2">HAMMER2</a></li></ul></li> <li><a class="mw-selflink selflink">HFS</a> (<a href="/wiki/Classic_Mac_OS" title="Classic Mac OS">Classic Mac OS</a>)</li> <li><a href="/wiki/Hierarchical_File_System_(IBM_MVS)" title="Hierarchical File System (IBM MVS)">HFS</a> (<a href="/wiki/MVS" title="MVS">MVS</a>)</li> <li><a href="/wiki/HFS_Plus" title="HFS Plus">HFS+</a></li> <li><a href="/wiki/High_Performance_File_System" title="High Performance File System">HPFS</a></li> <li><a href="/wiki/High_Throughput_File_System" title="High Throughput File System">HTFS</a></li> <li><a href="/wiki/JFS_(file_system)" title="JFS (file system)">JFS</a></li> <li><a href="/wiki/Log-structured_File_System_(BSD)" title="Log-structured File System (BSD)">LFS</a></li> <li>MFS <ul><li><a href="/wiki/Macintosh_File_System" title="Macintosh File System">Macintosh File System</a></li> <li><a href="/wiki/TiVo_Media_File_System" title="TiVo Media File System">TiVo Media File System</a></li></ul></li> <li><a href="/wiki/MINIX_file_system" title="MINIX file system">MINIX</a></li> <li><a href="/wiki/NetWare_File_System" title="NetWare File System">NetWare File System</a></li> <li><a href="/wiki/Next3" title="Next3">Next3</a></li> <li><a href="/wiki/NILFS" title="NILFS">NILFS</a> <ul><li><a href="/wiki/NILFS" title="NILFS">NILFS2</a></li></ul></li> <li><a href="/wiki/Novell_Storage_Services" title="Novell Storage Services">NSS</a></li> <li><a href="/wiki/NTFS" title="NTFS">NTFS</a></li> <li><a href="/wiki/OneFS_distributed_file_system" title="OneFS distributed file system">OneFS</a></li> <li><a href="/wiki/OpenZFS" title="OpenZFS">OpenZFS</a></li> <li><a href="/wiki/Professional_File_System" title="Professional File System">PFS</a></li> <li><a href="/wiki/QFS" title="QFS">QFS</a></li> <li><a href="/wiki/QNX4FS" title="QNX4FS">QNX4FS</a></li> <li><a href="/wiki/ReFS" title="ReFS">ReFS</a></li> <li><a href="/wiki/ReiserFS" title="ReiserFS">ReiserFS</a> <ul><li><a href="/wiki/Reiser4" title="Reiser4">Reiser4</a></li></ul></li> <li><a href="/wiki/Datalight#Reliance_family" title="Datalight">Reliance</a></li> <li><a href="/wiki/Datalight#Reliance_Nitro" title="Datalight">Reliance Nitro</a></li> <li><a href="/wiki/Remote_File_Sharing" title="Remote File Sharing">RFS</a></li> <li>SFS <ul><li>Shared File System (<a href="/wiki/VM_(operating_system)" title="VM (operating system)">VM</a>)</li> <li><a href="/wiki/Smart_File_System" title="Smart File System">Smart File System</a></li></ul></li> <li><a href="/wiki/StorNext_File_System" title="StorNext File System">SNFS</a></li> <li><a href="/wiki/Soup_(Apple)" title="Soup (Apple)">Soup (Apple)</a></li> <li><a href="/wiki/Tux3" title="Tux3">Tux3</a></li> <li><a href="/wiki/UBIFS" title="UBIFS">UBIFS</a></li> <li><a href="/wiki/Unix_File_System" title="Unix File System">UFS/UFS2</a> <ul><li><a href="/wiki/Soft_updates" title="Soft updates">soft updates</a></li> <li><a href="/wiki/Write_Ahead_Physical_Block_Logging" title="Write Ahead Physical Block Logging">WAPBL</a></li></ul></li> <li><a href="/wiki/Veritas_File_System" title="Veritas File System">VxFS</a></li> <li><a href="/wiki/Write_Anywhere_File_Layout" title="Write Anywhere File Layout">WAFL</a></li> <li><a href="/wiki/Xiafs" title="Xiafs">Xiafs</a></li> <li><a href="/wiki/XFS" title="XFS">XFS</a></li> <li><a href="/wiki/Xsan" title="Xsan">Xsan</a></li> <li><a href="/wiki/ZFS_(z/OS_file_system)" title="ZFS (z/OS file system)">zFS</a> (<a href="/wiki/Z/OS" title="Z/OS">z/OS</a>)</li> <li><a href="/wiki/ZFS" title="ZFS">ZFS</a> (<a href="/wiki/Sun_Microsystems" title="Sun Microsystems">Sun</a>)</li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Optical_disc" title="Optical disc">Optical disc</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/High_Sierra_Format" class="mw-redirect" title="High Sierra Format">HSF</a></li> <li><a href="/wiki/ISO_9660" title="ISO 9660">ISO 9660</a></li> <li><a href="/wiki/ISO_13490" title="ISO 13490">ISO 13490</a></li> <li><a href="/wiki/Universal_Disk_Format" title="Universal Disk Format">UDF</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Flash_memory" title="Flash memory">Flash memory</a> and <a href="/wiki/Solid-state_drive" title="Solid-state drive">SSD</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Apple_File_System" title="Apple File System">APFS</a></li> <li><a href="/wiki/File_Allocation_Table" title="File Allocation Table">FAT</a></li> <li><a href="/wiki/ExFAT" title="ExFAT">exFAT</a></li> <li><a href="/wiki/Transaction-Safe_FAT_File_System" title="Transaction-Safe FAT File System">TFAT</a></li> <li><a href="/wiki/EROFS" title="EROFS">EROFS</a></li> <li><a href="/wiki/F2FS" title="F2FS">F2FS</a></li> <li><a href="/wiki/JFS_(file_system)" title="JFS (file system)">JFS</a></li> <li><a href="/wiki/Non-Volatile_File_System" title="Non-Volatile File System">NVFS</a></li></ul> </div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th id="host-side_wear_leveling" scope="row" class="navbox-group" style="width:1%">host-side <a href="/wiki/Wear_leveling" title="Wear leveling">wear leveling</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/CHFS" title="CHFS">CHFS</a></li> <li><a href="/wiki/JFFS" title="JFFS">JFFS</a></li> <li><a href="/wiki/JFFS2" title="JFFS2">JFFS2</a></li> <li><a href="/wiki/LogFS" title="LogFS">LogFS</a></li> <li><a href="/wiki/NILFS" title="NILFS">NILFS</a> <ul><li><a href="/wiki/NILFS" title="NILFS">NILFS2</a></li></ul></li> <li><a href="/wiki/YAFFS" title="YAFFS">YAFFS</a></li> <li><a href="/wiki/UBIFS" title="UBIFS">UBIFS</a></li></ul> </div></td></tr></tbody></table><div> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Clustered_file_system#Distributed_file_systems" title="Clustered file system">Distributed parallel</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/BeeGFS" title="BeeGFS">BeeGFS</a></li> <li><a href="/wiki/Ceph_(software)" title="Ceph (software)">Ceph</a></li> <li><a href="/wiki/CXFS" title="CXFS">CXFS</a></li> <li><a href="/wiki/GFS2" title="GFS2">GFS2</a></li> <li><a href="/wiki/Google_File_System" title="Google File System">Google File System</a></li> <li><a href="/wiki/OCFS2" title="OCFS2">OCFS2</a></li> <li><a href="/wiki/OrangeFS" title="OrangeFS">OrangeFS</a></li> <li><a href="/wiki/Parallel_Virtual_File_System" title="Parallel Virtual File System">PVFS</a></li> <li><a href="/wiki/Quantcast_File_System" title="Quantcast File System">QFS</a></li> <li><a href="/wiki/Xsan" title="Xsan">Xsan</a></li> <li><i><a href="/wiki/List_of_file_systems#Distributed_parallel_file_systems" title="List of file systems">more...</a></i></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Network-attached_storage" title="Network-attached storage">NAS</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/9P_(protocol)" title="9P (protocol)">9P</a></li> <li><a href="/wiki/Andrew_File_System" title="Andrew File System">AFS</a> (<a href="/wiki/OpenAFS" title="OpenAFS">OpenAFS</a>)</li> <li><a href="/wiki/Apple_Filing_Protocol" title="Apple Filing Protocol">AFP</a></li> <li><a href="/wiki/Coda_(file_system)" title="Coda (file system)">Coda</a></li> <li><a href="/wiki/Distributed_File_System_(Microsoft)" title="Distributed File System (Microsoft)">DFS</a></li> <li><a href="/wiki/Google_File_System" title="Google File System">Google File System</a></li> <li><a href="/wiki/GPFS" title="GPFS">GPFS</a></li> <li><a href="/wiki/Lustre_(file_system)" title="Lustre (file system)">Lustre</a></li> <li><a href="/wiki/NetWare_Core_Protocol" title="NetWare Core Protocol">NCP</a></li> <li><a href="/wiki/Network_File_System" title="Network File System">NFS</a></li> <li><a href="/wiki/Elliptics" title="Elliptics">POHMELFS</a></li> <li><a href="/wiki/Apache_Hadoop" title="Apache Hadoop">Hadoop</a></li> <li><a href="/wiki/Server_Message_Block" title="Server Message Block">SMB (CIFS)</a></li> <li><a href="/wiki/SSHFS" title="SSHFS">SSHFS</a></li> <li><i><a href="/wiki/List_of_file_systems#Distributed_file_systems" title="List of file systems">more...</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Specialized</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Aufs" title="Aufs">Aufs</a></li> <li><a href="/wiki/AXFS" title="AXFS">AXFS</a></li> <li><a href="/wiki/Boot_File_System" title="Boot File System">Boot File System</a></li> <li><a href="/wiki/CDfs" title="CDfs">CDfs</a></li> <li><a href="/wiki/Compact_Disc_File_System" title="Compact Disc File System">Compact Disc File System</a></li> <li><a href="/wiki/Cramfs" title="Cramfs">cramfs</a></li> <li><a href="/wiki/Davfs2" title="Davfs2">Davfs2</a></li> <li><a href="/wiki/EROFS" title="EROFS">EROFS</a></li> <li><a href="/wiki/FTPFS" title="FTPFS">FTPFS</a></li> <li><a href="/wiki/Filesystem_in_Userspace" title="Filesystem in Userspace">FUSE</a></li> <li><a href="/wiki/Lnfs" title="Lnfs">Lnfs</a></li> <li><a href="/wiki/Linear_Tape_File_System" title="Linear Tape File System">LTFS</a></li> <li><a href="/wiki/NOVA_(filesystem)" title="NOVA (filesystem)">NOVA</a></li> <li><a href="/wiki/Rational_MultiVersion_File_System" class="mw-redirect" title="Rational MultiVersion File System">MVFS</a></li> <li><a href="/wiki/SquashFS" title="SquashFS">SquashFS</a></li> <li><a href="/wiki/FAT_filesystem_and_Linux" title="FAT filesystem and Linux">UMSDOS</a></li> <li><a href="/wiki/OverlayFS" title="OverlayFS">OverlayFS</a></li> <li><a href="/wiki/UnionFS" title="UnionFS">UnionFS</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Pseudo</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Configfs" title="Configfs">configfs</a></li> <li><a href="/wiki/Device_file" title="Device file">devfs</a></li> <li><a href="/wiki/Debugfs" title="Debugfs">debugfs</a></li> <li><a href="/wiki/Kernfs_(BSD)" title="Kernfs (BSD)">kernfs</a></li> <li><a href="/wiki/Procfs" title="Procfs">procfs</a></li> <li>specfs</li> <li><a href="/wiki/Sysfs" title="Sysfs">sysfs</a></li> <li><a href="/wiki/Tmpfs" title="Tmpfs">tmpfs</a></li> <li><a href="/wiki/WinFS" title="WinFS">WinFS</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Filesystem-level_encryption" title="Filesystem-level encryption">Encrypted</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/ECryptfs" title="ECryptfs">eCryptfs</a></li> <li><a href="/wiki/EncFS" title="EncFS">EncFS</a></li> <li><a href="/wiki/Encrypting_File_System" title="Encrypting File System">EFS</a></li> <li><a href="/wiki/Rubberhose_(file_system)" class="mw-redirect" title="Rubberhose (file system)">Rubberhose</a></li> <li><a href="/wiki/SSHFS" title="SSHFS">SSHFS</a></li> <li><a href="/wiki/Oracle_ZFS" title="Oracle ZFS">ZFS</a></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Types</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Clustered_file_system" title="Clustered file system">Clustered</a> <ul><li><a href="/wiki/Global_file_system" title="Global file system">Global</a></li> <li><a href="/wiki/Grid_file_system" title="Grid file system">Grid</a></li> <li><a href="/wiki/Self-certifying_File_System" title="Self-certifying File System">Self-certifying</a></li></ul></li> <li><a href="/wiki/Flash_file_system" title="Flash file system">Flash</a></li> <li><a href="/wiki/Journaling_file_system" title="Journaling file system">Journaling</a></li> <li><a href="/wiki/Log-structured_file_system" title="Log-structured file system">Log-structured</a></li> <li><a href="/wiki/Object_storage" title="Object storage">Object</a></li> <li><a href="/wiki/Record-oriented_filesystem" title="Record-oriented filesystem">Record-oriented</a></li> <li><a href="/wiki/Semantic_file_system" title="Semantic file system">Semantic</a></li> <li><a href="/wiki/Steganographic_file_system" title="Steganographic file system">Steganographic</a></li> <li><a href="/wiki/Synthetic_file_system" title="Synthetic file system">Synthetic</a></li> <li><a href="/wiki/Versioning_file_system" title="Versioning file system">Versioning</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Features</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><td colspan="2" class="navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Case_preservation" title="Case preservation">Case preservation</a></li> <li><a href="/wiki/Copy-on-write" title="Copy-on-write">Copy-on-write</a></li> <li><a href="/wiki/Data_deduplication" title="Data deduplication">Data deduplication</a></li> <li><a href="/wiki/Data_scrubbing" title="Data scrubbing">Data scrubbing</a></li> <li><a href="/wiki/Execute_in_place" title="Execute in place">Execute in place</a></li> <li><a href="/wiki/Extent_(file_systems)" title="Extent (file systems)">Extent</a></li> <li><a href="/wiki/File_attribute" title="File attribute">File attribute</a> <ul><li><a href="/wiki/Extended_file_attributes" title="Extended file attributes">Extended file attributes</a></li></ul></li> <li><a href="/wiki/File_change_log" title="File change log">File change log</a></li> <li><a href="/wiki/Fork_(file_system)" title="Fork (file system)">Fork</a></li> <li>Links <ul><li><a href="/wiki/Hard_link" title="Hard link">Hard</a></li> <li><a href="/wiki/Symbolic_link" title="Symbolic link">Symbolic</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Computer_access_control" title="Computer access control">Access control</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Access-control_list" title="Access-control list">Access-control list</a></li> <li><a href="/wiki/Filesystem-level_encryption" title="Filesystem-level encryption">Filesystem-level encryption</a></li> <li><a href="/wiki/File-system_permissions" title="File-system permissions">Permissions</a> <ul><li><a href="/wiki/Chmod" title="Chmod">Modes</a></li> <li><a href="/wiki/Sticky_bit" title="Sticky bit">Sticky bit</a></li></ul></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/Interface_(computing)" title="Interface (computing)">Interfaces</a></th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/File_manager" title="File manager">File manager</a></li> <li><a href="/wiki/File_system_API" title="File system API">File system API</a> <ul><li><a href="/wiki/Installable_File_System" title="Installable File System">Installable File System</a></li></ul></li> <li><a href="/wiki/Virtual_file_system" title="Virtual file system">Virtual file system</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%"><a href="/wiki/List_of_file_systems" title="List of file systems">Lists</a></th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/List_of_cryptographic_file_systems" title="List of cryptographic file systems">Cryptographic</a></li> <li><a href="/wiki/List_of_default_file_systems" title="List of default file systems">Default</a></li> <li><a href="/wiki/List_of_log-structured_file_systems" title="List of log-structured file systems">Log-structured</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Layouts</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Master_Boot_Record" class="mw-redirect" title="Master Boot Record">Master Boot Record</a></li> <li><a href="/wiki/GUID_Partition_Table" title="GUID Partition Table">GUID Partition Table</a></li> <li><a href="/wiki/Apple_Partition_Map" title="Apple Partition Map">Apple Partition Map</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img 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