What is file allocation table?

A file allocation table (FAT) is a file system developed for hard drives that originally used 12 or 16 bits for each cluster entry into the file allocation table. It is used by the operating system (OS) to manage files on hard drives and other computer systems.

-www.techopedia.com

MS-DOS is ment to be installed on to a partition with the File Allocation Table

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file allocation table - video