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.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">ADFS</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">Hugo Tyson, Nick Reeves (<a href="/wiki/Acorn_Computers" title="Acorn Computers">Acorn Computers</a>)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Full name</th><td class="infobox-data">Advanced Disc Filing System</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Introduced</th><td class="infobox-data">1983<span class="noprint">; 42 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">1983</span>)</span> with <a href="/wiki/Acorn_MOS" title="Acorn MOS">Acorn MOS</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>Hugo</code> or <code>Nick</code> (Directory header/footer)</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">Hierarchical fixed-length tables</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">File allocation</th><td class="infobox-data">One range per file plus table of free-space ranges (L), bitmap with embedded file IDs (E)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Bad blocks</th><td class="infobox-data">none (L),<sup id="cite_ref-reeves-efmt_1-0" class="reference"><a href="#cite_note-reeves-efmt-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> marked in bitmap (E)</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">512 <a href="/wiki/Megabyte" title="Megabyte">MB</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Max file size</th><td class="infobox-data">512 <a href="/wiki/Megabyte" title="Megabyte">MB</a></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">47 per directory (L), 77 per directory (E)</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Max filename length</th><td class="infobox-data">10 characters</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Allowed filename<br />characters</th><td class="infobox-data"><a href="/wiki/ASCII" title="ASCII">ASCII</a> (Acorn MOS), <span class="nowraplinks"><a href="/wiki/ISO_8859-1" class="mw-redirect" title="ISO 8859-1">ISO 8859-1</a></span> (RISC OS)</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">Modification</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Date range</th><td class="infobox-data">1 January 1900 - 3 June 2248</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Date resolution</th><td class="infobox-data">10 ms</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">no</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Attributes</th><td class="infobox-data">Load address, execute address and file cycle number (Acorn MOS); File type and modification time (RISC OS); User read/write/execute-only; public read/write/execute-only; Deletion lock</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">None</td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Transparent<br />compression</th><td class="infobox-data">No</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 scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Data_deduplication" title="Data deduplication">Data deduplication</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/Acorn_MOS" title="Acorn MOS">Acorn MOS</a>, <a href="/wiki/RISC_OS" title="RISC OS">RISC OS</a></td></tr></tbody></table> <p>The <b>Advanced Disc Filing System</b> (<b>ADFS</b>) is a computing <a href="/wiki/File_system" title="File system">file system</a> unique to the <a href="/wiki/Acorn_Computers_Ltd" class="mw-redirect" title="Acorn Computers Ltd">Acorn</a> computer range and <a href="/wiki/RISC_OS" title="RISC OS">RISC OS</a>-based successors. Initially based on the rare Acorn Winchester Filing System, it was renamed to the Advanced Disc Filing System when support for <a href="/wiki/Floppy_disc" class="mw-redirect" title="Floppy disc">floppy discs</a> was added (using a <a href="/wiki/Western_Digital_FD1771" title="Western Digital FD1771">WD1770 floppy disc controller</a>) and on later <a href="/wiki/32-bit" class="mw-redirect" title="32-bit">32-bit</a> systems a variant of a PC-style floppy controller.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p><p>Acorn's original <a href="/wiki/Disc_Filing_System" title="Disc Filing System">Disc Filing System</a> was limited to 31 files per disk surface, 7 characters per file name and a single character for directory names, a format inherited from the earlier Atom and System 3–5 <a href="/wiki/Eurocard_(printed_circuit_board)" title="Eurocard (printed circuit board)">Eurocard</a> computers. To overcome some of these restrictions Acorn developed ADFS. The most dramatic change was the introduction of a hierarchical directory structure. The filename length increased from 7 to 10 letters and the number of files in a directory expanded to 47. It retained some superficial attributes from DFS; the directory separator continued to be a dot and <code>$</code> now indicated the hierarchical root of the filesystem. <code>^</code> was used to refer to the parent directory, <code>@</code> the current directory, and <code>\</code> was the previously visited directory. </p><p>The BBC Master Compact contained ADFS version 2.0, which provided the addition of format, verify and backup commands in ROM, but omitted support for hard discs.<sup id="cite_ref-acornuser198610a_3-0" class="reference"><a href="#cite_note-acornuser198610a-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="8-bit_usage">8-bit usage</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Disc_Filing_System&action=edit&section=1" title="Edit section: 8-bit usage"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>ADFS on 8-bit systems required a WD1770 or later 1772-series floppy controller, owing to the inability of the original Intel 8271 chip to cope with the double-density format ADFS required. ADFS could however be used to support hard discs without a 1770 controller present; in development the use of hard discs was the primary goal, extension to handle floppies came later.<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. (March 2021)">citation needed</span></a></i>]</sup> The 1770 floppy controller was directly incorporated into the design of the Master Series and B+ models,<sup id="cite_ref-acornuser198507_4-0" class="reference"><a href="#cite_note-acornuser198507-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> and was available as an upgrade board for the earlier Model B.<sup id="cite_ref-1770_disc_interface_5-0" class="reference"><a href="#cite_note-1770_disc_interface-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-1770_disc_upgrade_kit_6-0" class="reference"><a href="#cite_note-1770_disc_upgrade_kit-6"><span class="cite-bracket">[</span>6<span class="cite-bracket">]</span></a></sup> ADFS could be added to Model B and B+ systems with an additional upgrade.<sup id="cite_ref-adfs_upgrade_7-0" class="reference"><a href="#cite_note-adfs_upgrade-7"><span class="cite-bracket">[</span>7<span class="cite-bracket">]</span></a></sup> </p><p>The <a href="/wiki/Acorn_Electron#Acorn_Plus_3" title="Acorn Electron">Acorn Plus 3</a>, Acorn's official disc expansion for the Acorn Electron, was supplied with ADFS as standard, but this implementation featured various notable bugs. A file called <style data-mw-deduplicate="TemplateStyles:r886049734">.mw-parser-output .monospaced{font-family:monospace,monospace}</style><span class="monospaced">ZYSYSHELP</span> was "required by the system" and created during formatting.<sup id="cite_ref-plus3ug_8-0" class="reference"><a href="#cite_note-plus3ug-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Pages: 7">: 7 </span></sup> This was a kludge. Acorn's original ADFS implementation on the Electron was unreliable when writing to the first few tracks of a floppy disc, so this was a "fix" and simply involved writing a file full of garbage to the suspect part. The ADFS would then skip it.<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 is apparently true, but a source would be helpful. (March 2021)">citation needed</span></a></i>]</sup> Disc corruption could also occur if attempting to use the <style data-mw-deduplicate="TemplateStyles:r1239335663">.mw-parser-output .mw-tmpl-kbd{background:#EEE;color:var(--color-base)}@media screen{html.skin-theme-clientpref-night .mw-parser-output .mw-tmpl-kbd{background:#171a1d}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .mw-tmpl-kbd{background:#171a1d}}</style><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*COMPACT</kbd> command without disabling the blinking text cursor.<sup id="cite_ref-electronuser198808_9-0" class="reference"><a href="#cite_note-electronuser198808-9"><span class="cite-bracket">[</span>9<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-10" class="reference"><a href="#cite_note-10"><span class="cite-bracket">[</span>note 1<span class="cite-bracket">]</span></a></sup> Hugo Tyson, principal ADFS developer, recalls that this bug was found during late testing but not fixed in the initial ROM release in order to avoid late changes, as workarounds exist. </p><p>On the Electron, disc formatting was done via the <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239335663"><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*EFORM</kbd> command instead of the established <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239335663"><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*FORM40</kbd>/<link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239335663"><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*FORM80</kbd> DFS commands. Note additionally that the <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239335663"><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*EFORM</kbd> command differs from the equivalent <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239335663"><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*AFORM</kbd> command for the 1770 ADFS on the BBC Microcomputer. This is possibly as a result of needing to create the <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">ZYSYSHELP</span> file on the Electron. The <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239335663"><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*EFORM</kbd> command was only supplied on the Welcome disc that was shipped with the Plus3, and was not included in the ROM.<sup id="cite_ref-plus3ug_8-1" class="reference"><a href="#cite_note-plus3ug-8"><span class="cite-bracket">[</span>8<span class="cite-bracket">]</span></a></sup><sup class="reference nowrap"><span title="Pages: 48">: 48 </span></sup> </p><p>ADFS supported hard discs, and 5¼" and 3½" <a href="/wiki/Floppy_disc" class="mw-redirect" title="Floppy disc">floppy discs</a> formatted up to 640 KB capacity using double density <a href="/wiki/Modified_Frequency_Modulation" class="mw-redirect" title="Modified Frequency Modulation">MFM</a> encoding (<i>L</i> format; single-sided disks were supported with the <i>S</i> format (160 KB) and <i>M</i> format (320 KB)). ADFS as implemented in the BBC microcomputer system (and later RISC OS) never had support for single-density floppies. </p><p>Hard disc support in ADFS used the same format as <i>L</i> format floppies in terms of 256-byte blocks;<sup id="cite_ref-11" class="reference"><a href="#cite_note-11"><span class="cite-bracket">[</span>10<span class="cite-bracket">]</span></a></sup> only the underlying arrangement of tracks and sectors differed depending on the actual drive used, but this was managed by the <a href="/wiki/Small_Computer_System_Interface" class="mw-redirect" title="Small Computer System Interface">SCSI</a> controller. It interfaced to a <a href="/wiki/ST-506" class="mw-redirect" title="ST-506">ST506/ST412</a>-based Winchester unit via the BBC Micro's 1 MHz Bus, an Acorn-designed interface card (1 MHz Bus to SCSI adapter) and an off-the-shelf <a href="/wiki/Adaptec" title="Adaptec">Adaptec</a> SCSI controller (SCSI to ST-506 adapter). </p><p>Support for <a href="/wiki/Advanced_Technology_Attachment" class="mw-redirect" title="Advanced Technology Attachment">IDE</a>/<a href="/wiki/ATAPI" title="ATAPI">ATAPI</a> style drives has been added 'unofficially' by third parties in recent years.<sup id="cite_ref-12" class="reference"><a href="#cite_note-12"><span class="cite-bracket">[</span>11<span class="cite-bracket">]</span></a></sup> </p><p>The ADFS file format used the ASCII bytes <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r886049734"><span class="monospaced">Hugo</span> to delimit the directory names on the disc, named after ADFS author Hugo Tyson. </p> <div class="mw-heading mw-heading2"><h2 id="32-bit_usage_(Arthur_and_RISC_OS)"><span id="32-bit_usage_.28Arthur_and_RISC_OS.29"></span>32-bit usage (Arthur and RISC OS)</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Disc_Filing_System&action=edit&section=2" title="Edit section: 32-bit usage (Arthur and RISC OS)"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>On 32-bit systems, a WD 1770 or 1772 was initially used as a floppy controller on the early machines of the range. Later models utilised a PC style multi-I/O controller requiring slight changes to ADFS. In addition to legacy support for the 'L'-type format, <a href="/wiki/Arthur_(operating_system)" class="mw-redirect" title="Arthur (operating system)">Arthur</a> and later <a href="/wiki/RISC_OS" title="RISC OS">RISC OS</a> provided enhanced formats which overcome the limitations of the BBC Micro. </p><p>Arthur added <i>D</i> format with 77 entries per directory as opposed to the previous 47, also usable on hard discs and a new 800 KB double-density floppy format. A per-file "type" attribute was added in space previously used to store Load and Execute addresses. The 12 bits of type information is used to denote the contents or intended use of a file, typically presented as three <a href="/wiki/Hexadecimal" title="Hexadecimal">hexadecimal</a> digits. This is similar to the 32-bit type attributes stored in Apple's <a href="/wiki/Hierarchical_File_System_(Apple)" title="Hierarchical File System (Apple)">HFS</a> file system, and conceptually comparable to the more general use of <a href="/wiki/MIME_media_type" class="mw-redirect" title="MIME media type">MIME Types</a> by the <a href="/wiki/BeOS" title="BeOS">Be Operating System</a> (BeOS), or <a href="/wiki/Magic_number_(programming)#Format_indicator" title="Magic number (programming)">magic numbers</a> in Unix systems (though the latter is stored as part of the file, not as metadata). </p><p>RISC OS brought in <i>E</i> and <i>F</i> format for double-density discs and high-density discs/hard disc drives respectively. These formats support file fragmentation (with the so-called "new map"), storage of multiple files per fragment and storage of small files in directory tables. The allocation strategy is optimised to minimise fragmentation, and sometimes performs defragmentation as part of a file storage operation.<sup id="cite_ref-reeves-efmt_1-1" class="reference"><a href="#cite_note-reeves-efmt-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> RISC OS 4 added <i>E+/F+</i> format which allowed for long filenames and more than 77 files per directory.<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. (June 2007)">citation needed</span></a></i>]</sup> More recent versions of RISC OS, including those for <a href="/wiki/Iyonix" class="mw-redirect" title="Iyonix">Iyonix</a>, continue to provide ADFS, and have further extended it to cope with larger hard disc sizes. </p><p>Unlike the 8-bit implementation, ADFS as implemented on RISC OS is not monolithic. A system module called "ADFS" provides no more than the block driver and user interfaces, where the "FileCore" module contains the actual file system implementation, and FileSwitch contains the VFS and high-level file-access API implementations. This allows for other hardware to use the ADFS format easily, such as IDEFS (commonly used for IDE add-on cards), SCSIFS, and the network-aware AppFS. FileCore and FileSwitch's functions are in some ways similar to the IFS and IO system managers in Windows NT. This flexibility has allowed other filing systems to be implemented into RISC OS relatively easily. </p> <div class="mw-heading mw-heading2"><h2 id="Support_for_ADFS_on_other_platforms">Support for ADFS on other platforms</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Disc_Filing_System&action=edit&section=3" title="Edit section: Support for ADFS on other platforms"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The <a href="/wiki/Linux" title="Linux">Linux</a> kernel has ADFS support for <i>E</i> format and later. </p><p><a href="/wiki/NetBSD" title="NetBSD">NetBSD</a> has filecore support<sup id="cite_ref-13" class="reference"><a href="#cite_note-13"><span class="cite-bracket">[</span>12<span class="cite-bracket">]</span></a></sup> in NetBSD 1.4 onwards. </p><p>Tools such as Omniflop (in Windows 2000 and later), and Libdsk support permit the 'physical' layout of ADFS floppies to be read on PC systems utilising an internal drive. However the logical structure remains unimplemented. </p> <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=Advanced_Disc_Filing_System&action=edit&section=4" 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 mw-references-columns"><ol class="references"> <li id="cite_note-reeves-efmt-1"><span class="mw-cite-backlink">^ <a href="#cite_ref-reeves-efmt_1-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-reeves-efmt_1-1"><sup><i><b>b</b></i></sup></a></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="CITEREFReeves1990" class="citation web cs1">Reeves, Nick (26 October 1990). <a rel="nofollow" class="external text" href="http://www.chiark.greenend.org.uk/~theom/riscos/docs/ultimate/a252efmt.txt">"E format design document"</a><span class="reference-accessdate">. Retrieved <span class="nowrap">24 May</span> 2013</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=E+format+design+document&rft.date=1990-10-26&rft.aulast=Reeves&rft.aufirst=Nick&rft_id=http%3A%2F%2Fwww.chiark.greenend.org.uk%2F~theom%2Friscos%2Fdocs%2Fultimate%2Fa252efmt.txt&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><a rel="nofollow" class="external text" href="http://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Acorn_ADFSUG.pdf"><i>Advanced Disc Filing System: User Guide</i></a> <span class="cs1-format">(PDF)</span>. Acorn Computers Limited. September 1985<span class="reference-accessdate">. Retrieved <span class="nowrap">1 August</span> 2016</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Advanced+Disc+Filing+System%3A+User+Guide&rft.pub=Acorn+Computers+Limited&rft.date=1985-09&rft_id=http%3A%2F%2Fchrisacorns.computinghistory.org.uk%2Fdocs%2FAcorn%2FManuals%2FAcorn_ADFSUG.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-acornuser198610a-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-acornuser198610a_3-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation news cs1"><a rel="nofollow" class="external text" href="https://archive.org/details/AcornUser051-Oct86/page/n16/mode/1up">"Taking the lid off the Master Compact"</a>. <i>Acorn User</i>. October 1986. p. 17<span class="reference-accessdate">. Retrieved <span class="nowrap">5 September</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Acorn+User&rft.atitle=Taking+the+lid+off+the+Master+Compact&rft.pages=17&rft.date=1986-10&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2FAcornUser051-Oct86%2Fpage%2Fn16%2Fmode%2F1up&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-acornuser198507-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-acornuser198507_4-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFSmith1985" class="citation news cs1">Smith, Bruce (July 1985). <a rel="nofollow" class="external text" href="https://archive.org/details/AcornUser036-Jul85/page/n161/mode/2up">"B+ Grading"</a>. <i>Acorn User</i>. pp. <span class="nowrap">160–</span>161<span class="reference-accessdate">. Retrieved <span class="nowrap">18 October</span> 2020</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Acorn+User&rft.atitle=B%2B+Grading&rft.pages=%3Cspan+class%3D%22nowrap%22%3E160-%3C%2Fspan%3E161&rft.date=1985-07&rft.aulast=Smith&rft.aufirst=Bruce&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2FAcornUser036-Jul85%2Fpage%2Fn161%2Fmode%2F2up&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-1770_disc_interface-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-1770_disc_interface_5-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><a rel="nofollow" class="external text" href="http://chrisacorns.computinghistory.org.uk/docs/Acorn/Misc/Acorn_1770DiscIF.pdf"><i>1770 Disc Interface</i></a> <span class="cs1-format">(PDF)</span>. Acorn Computers Limited<span class="reference-accessdate">. Retrieved <span class="nowrap">6 March</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=1770+Disc+Interface&rft.pub=Acorn+Computers+Limited&rft_id=http%3A%2F%2Fchrisacorns.computinghistory.org.uk%2Fdocs%2FAcorn%2FMisc%2FAcorn_1770DiscIF.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-1770_disc_upgrade_kit-6"><span class="mw-cite-backlink"><b><a href="#cite_ref-1770_disc_upgrade_kit_6-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><a rel="nofollow" class="external text" href="http://chrisacorns.computinghistory.org.uk/docs/Acorn/Tech/Acorn_1770DiscIFUpgradeKit.pdf"><i>1770 Disc Interface Upgrade Kit Fitting Instructions</i></a> <span class="cs1-format">(PDF)</span>. Acorn Computers Limited. August 1985<span class="reference-accessdate">. Retrieved <span class="nowrap">11 March</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=1770+Disc+Interface+Upgrade+Kit+Fitting+Instructions&rft.pub=Acorn+Computers+Limited&rft.date=1985-08&rft_id=http%3A%2F%2Fchrisacorns.computinghistory.org.uk%2Fdocs%2FAcorn%2FTech%2FAcorn_1770DiscIFUpgradeKit.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-adfs_upgrade-7"><span class="mw-cite-backlink"><b><a href="#cite_ref-adfs_upgrade_7-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><a rel="nofollow" class="external text" href="http://chrisacorns.computinghistory.org.uk/docs/Acorn/Misc/Acorn_ADFSUpgrade.pdf"><i>ADFS upgrade</i></a> <span class="cs1-format">(PDF)</span>. Acorn Computers Limited<span class="reference-accessdate">. Retrieved <span class="nowrap">6 March</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=ADFS+upgrade&rft.pub=Acorn+Computers+Limited&rft_id=http%3A%2F%2Fchrisacorns.computinghistory.org.uk%2Fdocs%2FAcorn%2FMisc%2FAcorn_ADFSUpgrade.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-plus3ug-8"><span class="mw-cite-backlink">^ <a href="#cite_ref-plus3ug_8-0"><sup><i><b>a</b></i></sup></a> <a href="#cite_ref-plus3ug_8-1"><sup><i><b>b</b></i></sup></a></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation book cs1"><a rel="nofollow" class="external text" href="http://chrisacorns.computinghistory.org.uk/docs/Acorn/Manuals/Acorn_Plus3UG.pdf"><i>The Electron Plus 3 User Guide</i></a> <span class="cs1-format">(PDF)</span>. Acorn Computers Limited. October 1984<span class="reference-accessdate">. Retrieved <span class="nowrap">6 March</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=The+Electron+Plus+3+User+Guide&rft.pub=Acorn+Computers+Limited&rft.date=1984-10&rft_id=http%3A%2F%2Fchrisacorns.computinghistory.org.uk%2Fdocs%2FAcorn%2FManuals%2FAcorn_Plus3UG.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-electronuser198808-9"><span class="mw-cite-backlink"><b><a href="#cite_ref-electronuser198808_9-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite id="CITEREFWaddilove1988" class="citation news cs1">Waddilove, Roland (August 1988). <a rel="nofollow" class="external text" href="https://archive.org/details/ElectronUserVolume5/Electron-User-05-11/page/n8/mode/1up">"Improving on perfection"</a>. <i>Electron User</i>. Vol. 5, no. 11. p. 9<span class="reference-accessdate">. Retrieved <span class="nowrap">20 January</span> 2021</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=article&rft.jtitle=Electron+User&rft.atitle=Improving+on+perfection&rft.volume=5&rft.issue=11&rft.pages=9&rft.date=1988-08&rft.aulast=Waddilove&rft.aufirst=Roland&rft_id=https%3A%2F%2Farchive.org%2Fdetails%2FElectronUserVolume5%2FElectron-User-05-11%2Fpage%2Fn8%2Fmode%2F1up&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-11"><span class="mw-cite-backlink"><b><a href="#cite_ref-11">^</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="http://mdfs.net/Docs/Comp/Disk/Format/ADFS">"Acorn 8-Bit ADFS Filesystem Structure"</a> <span class="cs1-format">(TXT)</span>. <i>Mdfs.net</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2016-08-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Mdfs.net&rft.atitle=Acorn+8-Bit+ADFS+Filesystem+Structure&rft_id=http%3A%2F%2Fmdfs.net%2FDocs%2FComp%2FDisk%2FFormat%2FADFS&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-12"><span class="mw-cite-backlink"><b><a href="#cite_ref-12">^</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="http://mdfs.net/Info/Comp/BBC/IDE">"BBC IDE Interface - MDFS::Info.Comp.BBC.IDE"</a>. <i>MDFS.net</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2016-08-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=MDFS.net&rft.atitle=BBC+IDE+Interface+-+MDFS%3A%3AInfo.Comp.BBC.IDE&rft_id=http%3A%2F%2Fmdfs.net%2FInfo%2FComp%2FBBC%2FIDE&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> <li id="cite_note-13"><span class="mw-cite-backlink"><b><a href="#cite_ref-13">^</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="http://www.netbsd.org/changes/1998.html#filecorefs">"Changes and NetBSD News in 1998"</a>. <i>Netbsd.org</i><span class="reference-accessdate">. Retrieved <span class="nowrap">2016-08-01</span></span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=Netbsd.org&rft.atitle=Changes+and+NetBSD+News+in+1998&rft_id=http%3A%2F%2Fwww.netbsd.org%2Fchanges%2F1998.html%23filecorefs&rfr_id=info%3Asid%2Fen.wikipedia.org%3AAdvanced+Disc+Filing+System" class="Z3988"></span></span> </li> </ol></div></div> <style data-mw-deduplicate="TemplateStyles:r1239549316">.mw-parser-output .refbegin{margin-bottom:0.5em}.mw-parser-output .refbegin-hanging-indents>ul{margin-left:0}.mw-parser-output .refbegin-hanging-indents>ul>li{margin-left:0;padding-left:3.2em;text-indent:-3.2em}.mw-parser-output .refbegin-hanging-indents ul,.mw-parser-output .refbegin-hanging-indents ul li{list-style:none}@media(max-width:720px){.mw-parser-output .refbegin-hanging-indents>ul>li{padding-left:1.6em;text-indent:-1.6em}}.mw-parser-output .refbegin-columns{margin-top:0.3em}.mw-parser-output .refbegin-columns ul{margin-top:0}.mw-parser-output .refbegin-columns li{page-break-inside:avoid;break-inside:avoid-column}@media screen{.mw-parser-output .refbegin{font-size:90%}}</style><div class="refbegin" style=""> <ul><li>Watford Electronics, "The Advanced Reference Manual for the BBC Master Series", 1988 (p. 169)</li> <li>Acorn Computers Ltd, "The BBC Microcomputer System Master Series Reference Manual Part 1", Part No, 0443–001, Issue 1, March 1986 - (Pages (J.10-1 to J10-3)</li></ul> </div> <div class="mw-heading mw-heading2"><h2 id="Notes">Notes</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Advanced_Disc_Filing_System&action=edit&section=5" title="Edit section: Notes"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239543626"><div class="reflist"> <div class="mw-references-wrap"><ol class="references"> <li id="cite_note-10"><span class="mw-cite-backlink"><b><a href="#cite_ref-10">^</a></b></span> <span class="reference-text">This was due to the fact that the <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239335663"><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*COMPACT</kbd> command used screen memory (by default) as working space during the operation, and the software-implemented blinking cursor corrupted that memory space. An alternative would be to give arguments to make it use non-screen memory for workspace, for example <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1239335663"><kbd class="mw-tmpl-kbd" style="letter-spacing:0.05em; padding-left:0.25em; padding-right:0.2em;">*COMPACT 40 20</kbd> in screen mode 6. On the BBC Micro, the blinking cursor, if enabled, was superimposed onto the display output by the 6845 CRTC and Acorn's video ULA, without changing any screen memory. The Acorn Electron did not have this extra hardware and had to alter screen memory in software to blink the cursor.</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=Advanced_Disc_Filing_System&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="http://mdfs.net/Docs/Comp/Disk/Format/ADFS">ADFS on-disk layout documentation</a></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 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</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 class="mw-selflink selflink">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" 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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 href="/wiki/Hierarchical_File_System_(Apple)" title="Hierarchical File System (Apple)">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_leveling27" 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/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><a href="/wiki/Inode" title="Inode">Inode</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 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="RISC_OS414" 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:RISC_OS" title="Template:RISC OS"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:RISC_OS" title="Template talk:RISC OS"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:RISC_OS" title="Special:EditPage/Template:RISC OS"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="RISC_OS414" style="font-size:114%;margin:0 4em"><a href="/wiki/RISC_OS" title="RISC OS">RISC OS</a></div></th></tr><tr><td class="navbox-abovebelow" colspan="2"><div><span class="noviewer" typeof="mw:File"><span title="Category"><img alt="" src="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/16px-Symbol_category_class.svg.png" decoding="async" width="16" height="16" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/23px-Symbol_category_class.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/9/96/Symbol_category_class.svg/31px-Symbol_category_class.svg.png 2x" data-file-width="180" data-file-height="185" /></span></span> <a href="/wiki/Category:RISC_OS_software" title="Category:RISC OS software">Category: RISC OS software</a></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Main companies<sup><small>a</small></sup></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/Castle_Technology" title="Castle Technology">Castle Technology</a></li> <li><a href="/wiki/RISC_OS_Open" title="RISC OS Open">RISC OS Open</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Hardware</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/Acorn_Archimedes" title="Acorn Archimedes">Archimedes series</a></li> <li><a href="/wiki/RiscPC" class="mw-redirect" title="RiscPC">RiscPC series</a></li> <li><a href="/wiki/Iyonix_PC" title="Iyonix PC">Iyonix</a></li> <li><a href="/wiki/A9home" title="A9home">A9home</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Emulation</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/Aemulor" title="Aemulor">Aemulor</a></li> <li><a href="/wiki/VirtualAcorn" title="VirtualAcorn">VirtualAcorn</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Key software<sup><small>b</small></sup></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/ArtWorks" title="ArtWorks">ArtWorks</a></li> <li><a href="/wiki/Impression_(software)" title="Impression (software)">Impression</a></li> <li><a href="/wiki/NetSurf" title="NetSurf">NetSurf</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">OS components</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 class="mw-selflink selflink">ADFS</a></li> <li><a href="/wiki/Arm_Image_Format" title="Arm Image Format">AIF file</a></li> <li><a href="/wiki/BBC_BASIC" title="BBC BASIC">BBC BASIC</a></li> <li><a href="/wiki/List_of_RISC_OS_bundled_applications" title="List of RISC OS bundled applications">Bundled applications</a></li> <li><a href="/wiki/Drag_and_drop" title="Drag and drop">Drag and drop</a></li> <li><a href="/wiki/Icon_bar" title="Icon bar">Icon bar</a></li> <li><a href="/wiki/Object_Linking_and_Embedding" title="Object Linking and Embedding">OLE</a></li> <li><a href="/wiki/Ram_disk" class="mw-redirect" title="Ram disk">Ram disk</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">OS utilities</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/MakeModes" title="MakeModes">MakeModes</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Books</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/ARM_system-on-chip_architecture" class="mw-redirect" title="ARM system-on-chip architecture">ARM system-on-chip architecture</a></i></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related and historical</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/Acorn_Computers" title="Acorn Computers">Acorn Computers</a></li> <li><a href="/wiki/ARM_Holdings" class="mw-redirect" title="ARM Holdings">ARM Holdings</a></li> <li><a href="/wiki/Element_14_(company)" class="mw-redirect" title="Element 14 (company)">Element 14</a></li> <li><a href="/wiki/Galileo_(operating_system)" title="Galileo (operating system)">Galileo</a></li> <li><a href="/wiki/History_of_RISC_OS" title="History of RISC OS">History of RISC OS</a></li> <li><a href="/wiki/Phoebe_(computer)" title="Phoebe (computer)">Phoebe</a></li> <li><a href="/wiki/RISCOS_Ltd" class="mw-redirect" title="RISCOS Ltd">RISCOS Ltd</a></li> <li><a href="/wiki/The_Electronic_Font_Foundry" title="The Electronic Font Foundry">The Electronic Font Foundry</a></li> <li><a href="/wiki/NCOS" title="NCOS">NCOS</a></li></ul> </div></td></tr><tr><td class="navbox-abovebelow" colspan="2"><div> <ul><li><sup><small>a</small></sup> Current companies only</li> <li><sup><small>b</small></sup> Addition of major functionality</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="BBC_Computer_Literacy_Project144" style="padding:3px"><table class="nowraplinks 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:BBC_Computer_Literacy_Project" title="Template:BBC Computer Literacy Project"><abbr title="View this template">v</abbr></a></li><li class="nv-talk"><a href="/wiki/Template_talk:BBC_Computer_Literacy_Project" title="Template talk:BBC Computer Literacy Project"><abbr title="Discuss this template">t</abbr></a></li><li class="nv-edit"><a href="/wiki/Special:EditPage/Template:BBC_Computer_Literacy_Project" title="Special:EditPage/Template:BBC Computer Literacy Project"><abbr title="Edit this template">e</abbr></a></li></ul></div><div id="BBC_Computer_Literacy_Project144" style="font-size:114%;margin:0 4em"><a href="/wiki/BBC_Micro" title="BBC Micro">BBC Computer Literacy Project</a></div></th></tr><tr><th scope="row" class="navbox-group" style="width:1%">BBC microcomputers</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/BBC_Micro" title="BBC Micro">Models A, B, B+</a></li> <li><a href="/wiki/BBC_Master" title="BBC Master">Master range</a></li> <li><a href="/wiki/Acorn_Archimedes" title="Acorn Archimedes">Archimedes range, A3000</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">TV programmes, services</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><i><a href="/wiki/Now_the_Chips_Are_Down" title="Now the Chips Are Down">Now the Chips Are Down</a></i></li> <li><i><a href="/wiki/The_Computer_Programme" title="The Computer Programme">The Computer Programme</a></i></li> <li><i><a href="/wiki/Making_the_Most_of_the_Micro" title="Making the Most of the Micro">Making the Most of the Micro</a></i></li> <li><i><a href="/wiki/Micro_Live" title="Micro Live">Micro Live</a></i></li> <li><a href="/wiki/Telesoftware" title="Telesoftware">Telesoftware</a> via <a href="/wiki/Ceefax" title="Ceefax">Ceefax</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">People</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/Micro_Live" title="Micro Live">David Allen</a></li> <li><a href="/wiki/John_Coll" title="John Coll">John Coll</a></li> <li><a href="/wiki/Christopher_Curry_(businessman)" title="Christopher Curry (businessman)">Christopher Curry</a></li> <li><a href="/wiki/Steve_Furber" title="Steve Furber">Steve Furber</a></li> <li><a href="/wiki/Hermann_Hauser" title="Hermann Hauser">Hermann Hauser</a></li> <li><a href="/wiki/Fred_Harris_(presenter)" title="Fred Harris (presenter)">Fred Harris</a></li> <li><a href="/wiki/Lesley_Judd" title="Lesley Judd">Lesley Judd</a></li> <li><a href="/wiki/Ian_McNaught-Davis" title="Ian McNaught-Davis">Ian McNaught-Davis</a></li> <li><a href="/wiki/Richard_T._Russell" title="Richard T. Russell">Richard Russell</a></li> <li><a href="/wiki/Chris_Serle" title="Chris Serle">Chris Serle</a></li> <li><a href="/wiki/Sophie_Wilson" title="Sophie Wilson">Sophie Wilson</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Software</th><td class="navbox-list-with-group navbox-list navbox-odd hlist" style="width:100%;padding:0"><div style="padding:0 0.25em"></div><table class="nowraplinks navbox-subgroup" style="border-spacing:0"><tbody><tr><th scope="row" class="navbox-group" style="width:1%">Acorn</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/Acorn_MOS" title="Acorn MOS">Acorn MOS</a></li> <li><a class="mw-selflink selflink">Advanced Disc Filing System</a></li> <li><a href="/wiki/Disc_Filing_System" title="Disc Filing System">Disc Filing System</a></li> <li><a href="/wiki/BBC_BASIC" title="BBC BASIC">BBC BASIC</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">BBCSoft</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><i><a href="/wiki/Doctor_Who_and_the_Warlord" title="Doctor Who and the Warlord">Doctor Who and the Warlord</a></i></li> <li><i><a href="/wiki/Doctor_Who:_The_First_Adventure" title="Doctor Who: The First Adventure">Doctor Who: The First Adventure</a></i></li> <li><i><a href="/wiki/Colossus_Chess" title="Colossus Chess">White Knight</a></i></li></ul> </div></td></tr></tbody></table><div></div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Companies</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/Acorn_Computers" title="Acorn Computers">Acorn Computers</a></li> <li><a href="/wiki/BBC" title="BBC">BBC</a></li> <li><a href="/wiki/Cambridge_Systems_Technology" title="Cambridge Systems Technology">Cambridge Systems Technology</a> (CST)</li> <li><a href="/wiki/Castle_Technology" title="Castle Technology">Castle Technology</a></li> <li><a href="/wiki/Cumana_(company)" title="Cumana (company)">Cumana</a></li> <li><a href="/wiki/Micro_Power" title="Micro Power">Micro Power</a></li> <li><a href="/wiki/Pace_plc" title="Pace plc">Pace Micro Technology</a></li> <li><a href="/wiki/Superior_Software" title="Superior Software">Superior Software</a></li> <li><a href="/wiki/Torch_Computers" title="Torch Computers">Torch Computers</a></li> <li><a href="/wiki/Watford_Electronics" title="Watford Electronics">Watford Electronics</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">BBC-branded peripherals</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/BBC_Micro_expansion_unit#Adapters" title="BBC Micro expansion unit">Adapters (IEEE488, Prestel, Teletext)</a></li> <li><a href="/wiki/BBC_Micro_expansion_unit#Second_processors" title="BBC Micro expansion unit">Second processors (6502, Z80)</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other projects</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/BBC_Domesday_Project" title="BBC Domesday Project">BBC Domesday Project</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" width="1" height="1" style="border: none; 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