How-To Geek

File Allocation Table (FAT)

File Allocation Table (FAT) is a legacy file system that still remains in wide use today; the naming of the system is a reference to the prominent role of the file index table which is created when the FAT disk is formatted.

Originally used for floppy disks and later for personal computer hard drives, FAT was the file system of choice for all DOS and later Windows computers throughout the 1980s and 1990s. Although inferior to modern file systems in many ways, FAT is such a fundamentally simple file system that modern computer systems still support it and it is still used for things like removable media such as flash drives and camera memory, as well as hard drives that will be shared across operating systems.

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