Dos before 3.0 used FAT12, limited to 16 MB, DOS 3.0 introduced FAT16 (though in a reduced 14 bit version) that extended size to 32 MB, DOS 4.0 had "real" 16 bi

Dos before 3.0 used FAT12, limited to 16 MB, DOS 3.0 introduced FAT16 (though in a reduced 14 bit version) that extended size to 32 MB, DOS 4.0 had "real" 16 bit FAT16: https://hardwaresecrets.com/hard-disk-drives-capacity-limits/ https://hardwaresecrets.com/hard-disk-drives-capacity-limits... These were limits to the partition/volume size, however.