 FATX is a family of file systems designed for Microsoft's Xbox video game console hard disk drives and memory cards, introduced in 2001.While resembling the same basic design ideas as FAT16 and 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 sector is 4 KiB in size and holds an 18 byte large BPB-like structure completely different from normal BPBs.