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As MS-DOS 3.0 formatted all 16 MB-32 MB partitions in the FAT16 format, a 20 MB hard disk formatted under MS-DOS 3.0 was not accessible by MS-DOS 2.0. [27] MS-DOS 3.0 to MS-DOS 3.30 could still access FAT12 partitions under 15 MB, but required all 16 MB-32 MB partitions to be FAT16, and so could not access MS-DOS 2.0 partitions in this size range.
For compatibility with MS-DOS/PC DOS, file systems should avoid to use data cluster 0xFF0 in cluster chains on FAT12 volumes (that is, treat it as a reserved cluster similar to 0xFF7). (NB. The correspondence of the low byte of the cluster number with the FAT ID and media descriptor values is the reason, why these cluster values are reserved.)
Hard drive: partition size max Native support: File systems Native support: floppy capacities 3.5" ... MS-DOS 1.25 — FAT12 — 160 KB; 320 KB 250.25 KB [10] No No
IBM introduced the first version of fdisk (officially dubbed "Fixed Disk Setup Program") in March 1983, with the release of the IBM PC/XT computer (the first PC to store data on a hard disk) and the IBM PC DOS 2.0 operating system. fdisk version 1.0 can create one FAT12 partition, delete it, change the active partition, or display partition data. fdisk writes the master boot record, which ...
Filesystems making use of a BIOS parameter block include FAT12 (except for in DOS 1.x), FAT16, FAT32, HPFS, and NTFS. Due to different types of fields and the amount of data they contain, the length of the BPB is different for FAT16, FAT32, and NTFS boot sectors. [ 1 ] (
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) 1987 ...
Size Density Sides Tracks tpi bpi Sectoring Coercivity Unformatted capacity per side 2 inch Video Floppy: 52 256 >800 kB or 50 fields of analog video [1]: 2 inch LT-1: double 80 245 2 1 ⁄ 2 inch
The partition type (or partition ID) in a partition's entry in the partition table inside a master boot record (MBR) is a byte value intended to specify the file system the partition contains or to flag special access methods used to access these partitions (e.g. special CHS mappings, LBA access, logical mapped geometries, special driver access, hidden partitions, secured or encrypted file ...