https://xboxdevwiki.net/api.php?action=feedcontributions&feedformat=atom&user=PWolframxboxdevwiki - User contributions [en]2026-04-26T11:43:45ZUser contributionsMediaWiki 1.28.0https://xboxdevwiki.net/index.php?title=FATX&diff=7419FATX2025-10-27T04:08:54Z<p>PWolfram: Added preliminary FATX header table.</p>
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<div>The file system used on the Xbox is [[FATX]], a variant of FAT16/32 developed by Microsoft specifically for the Xbox.<br />
<br />
The [[Config Sector]] contains the filesystem magic number, some basic filesystem metadata, and Xbox Live account information.<br />
<br />
== Header ==<br />
The header for FATX is similar to FAT12/16/32 but heavily trimmed down. The following parts are known:<br />
<br />
{| class="wikitable" <br />
|-<br />
! Offset<br />
! Length<br />
! Contents<br />
! Notes<br />
|-<br />
| 0x0<br />
| 0x4<br />
| Magic value ("FATX")<br />
| ASCII encoded.<br />
|-<br />
| 0x4<br />
| 0x4<br />
| Serial of partition<br />
| Created using Xbox RTC, unknown if this must be unique to mount.<br />
|-<br />
| 0x8<br />
| 0x4<br />
| Cluster size<br />
| The number of 512 byte chunks one cluster requires. Typically 32 on the internal HDD, 4 on [[Xbox Memory Unit|XMUs]].<br />
|-<br />
| 0xC<br />
| 0x4<br />
| Directory/FAT cluster count<br />
| Typically 1, unknown if more are supported as in FAT12/16/32.<br />
|-<br />
| 0x10<br />
| 0x40<br />
| Partition name<br />
| UTF-16le encoded name for a partition. Must be double-zero padded. Used to name XMUs, adding one to the internal HDD does nothing visible in stock firmware, but is retained. Untested on temporary partitions.<br />
|}<br />
<br />
== Implementations ==<br />
<br />
{| class="wikitable<br />
|-<br />
! Name<br />
! Platform<br />
! Read/Write<br />
! Description<br />
|-<br />
| Official<br />
| Xbox<br />
| Read/Write<br />
| Official FATX implementation by Microsoft<br />
|-<br />
| [https://github.com/mborgerson/fatx fatxfs]<br />
| GNU/Linux, macOS<br />
| Read-Only<br />
| [https://en.wikipedia.org/wiki/Filesystem_in_Userspace FUSE]-based implementation<br />
|}<br />
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== Further Reading ==<br />
* Most up to date: [https://hackmd.io/DXo0p8VnQLy3XQ7YR1Ny_w?view The FATX filesystem]<br />
* Archive of the xbox-linux project from 2010: [https://web.archive.org/web/20100617022009/http://www.xbox-linux.org/wiki/Differences_between_Xbox_FATX_and_MS-DOS_FAT Differences between Xbox FATX and MS-DOS FAT]<br />
* An [http://web.archive.org/web/20040616143741/http://www.xbox-linux.org/docs/hdpartfs.html older version of that document] including info about unknown (XBLA?) config sectors<br />
* Private writings from 2002: [https://web.archive.org/web/20020617181617/http://www.tardis.ed.ac.uk:80/~lucien/computing/projects/xbox/XBOX-disk-layout.htm XBOX DISK LAYOUT v0.13]</div>PWolframhttps://xboxdevwiki.net/index.php?title=Talk:Config_Sector&diff=7418Talk:Config Sector2025-10-27T03:51:07Z<p>PWolfram: Created page with "This doesn't appear to be correct at all, at time of writing, the "static" and "dynamic" and "PPPoE" fields are all blank from formatting the drive all the way through setting..."</p>
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<div>This doesn't appear to be correct at all, at time of writing, the "static" and "dynamic" and "PPPoE" fields are all blank from formatting the drive all the way through setting up DHCP or static settings for Insignia, outside of the "Xbox Live" portions where static/dynamic settings are actually held. What sets these, if any?<br />
[[User:PWolfram|PWolfram]] ([[User talk:PWolfram|talk]]) 03:51, 27 October 2025 (UTC)</div>PWolfram