Compatibility: 2.0+
Expects: AH 1bH
Returns: DS:BX address of a FAT ID byte (might indicate disk type)
DX total clusters (allocation units) on the disk
AL sectors per cluster
CX bytes per sector
Info: Returns information on the size and type of the default disk.
Disk size in bytes = (DX * AL * CX)
Warning: Notice that this changes the value of DS segment register.
Versions: DOS 1.x held the FAT in memory and returned DS:BX => FAT
DOS 2.0+ may retain only a portion of the FAT in memory.
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