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File Allocation Table (FAT) is a file system developed for personal computers and was the default file system for the MS-DOS and Windows 9x operating systems. [citation needed] Originally developed in 1977 for use on floppy disks, it was adapted for use on hard disks and other devices.
The FAT file system is a file system used on MS-DOS and Windows 9x family of operating systems. [3] It continues to be used on mobile devices and embedded systems, and thus is a well-suited file system for data exchange between computers and devices of almost any type and age from 1981 through to the present.
MS-DOS (/ ˌ ɛ m ˌ ɛ s ˈ d ɒ s / em ... It added support for the FAT32 file system and logical block addressing (LBA), and was the last version that could boot ...
Originally MS-DOS was designed to be an operating system that could run on any computer with a 8086-family microprocessor.It competed with other operating systems written for such computers, such as CP/M-86 and UCSD Pascal.
86-DOS: FAT12, but logically format incompatible with MS-DOS/PC DOS. 1981: PC DOS 1.0: FAT12: 1982: MS-DOS 1.25: FAT12: 1982: Commodore 64 / 1541: Commodore DOS (CBM DOS) 1984: PC DOS 3.0 / MS-DOS 3.0: FAT16: 1984: Classic Mac OS: Macintosh File System (MFS) 1985: Atari TOS: Modified FAT12: 1985: Classic Mac OS: Hierarchical File System (HFS ...
VFAT, a variant of FAT with an extended directory format, was introduced in Windows 95 and Windows NT 3.5. It allowed mixed-case Unicode long filenames (LFNs) in addition to classic 8.3 names by using multiple 32-byte directory entry records for long filenames (in such a way that old 8.3 system software will only recognize one as the valid directory entry).
Long filename (LFN) support is Microsoft's backward-compatible extension of the 8.3 filename (short filename) naming scheme used in MS-DOS.Long filenames can be more descriptive, including longer filename extensions such as .jpeg, .tiff, and .html that are common on other operating systems, rather than specialized shortened names such as .jpg, .tif, or .htm.
DOS uses the File Allocation Table (FAT) ... MS-DOS/IBM DOS 4 included DOS Shell; [52] DR DOS 5.0, released the following year, included ViewMAX, based upon GEM.