Editing File Allocation Table (section)

=== FATX ===
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FATX is a family of file systems designed for [[Microsoft]]'s [[Xbox (console)|Xbox]] [[video game console]] [[hard disk]] drives and [[memory card]]s,<ref name="Xbox_FATX-Spec" /><ref name="Xbox_Linux" /> introduced in 2001.

While resembling the same basic design ideas as [[#FAT16|FAT16]] and [[#FAT32|FAT32]], the '''FATX16''' and '''FATX32''' on-disk structures are simplified, but fundamentally incompatible with normal FAT16 and FAT32 file systems, making it impossible for normal FAT file system drivers to mount such volumes.

The non-bootable [[superblock (file systems)|superblock]] sector is 4&nbsp;KB in size and holds an 18&nbsp;byte large BPB-like structure completely different from normal [[FAT BPB|BPB]]s. Clusters are typically 16&nbsp;KB in size and there is only one copy of the FAT on the Xbox. Directory entries are 64&nbsp;bytes in size instead of the normal [[FAT directory entry|32&nbsp;bytes]]. Files can have filenames up to 42 characters long using the [[OEM character set]]<!-- not Unicode --> and be up to 4&nbsp;GB minus 1&nbsp;byte in size. The on-disk timestamps hold creation, modification and access dates and times but differ from FAT: in FAT, the [[Epoch (computing)|epoch]] is [[Epoch of 1980-01-01|1980]]; in FATX, the epoch is [[Epoch of 2000-01-01|2000]]. On the [[Xbox 360]], the epoch is 1980.<ref name="Xbox360_FATX" />