file allocation table
- noun a data file stored on disk containing the names of each file stored on the disk, together with its starting sector position, date and size.
- Its abbreviation is FAT. In some operating systems, a table that is utilized to locate files stored on a disk. Since data may be stored in non-contiguous areas of a disk, a FAT is needed to string together all the pieces of a file. A FAT also keeps track of available disk space, and notes bad sectors to avoid their use.