The file system used in DOS, OS/2 and many versions of Windows. The name comes from the "file allocation table" that is used to to keep track of the data on the disk. See FAT and FAT32.
"FAT file system." YourDictionary, n.d. Web. 17 August 2018. <http://www.yourdictionary.com/fat-file-system>.
FAT file system. (n.d.). Retrieved August 17th, 2018, from http://www.yourdictionary.com/fat-file-system