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AH = 1Bh
Return:
AL = sectors per cluster (allocation unit) CX = bytes per sector DX = total number of clusters DS:BX -> media ID byte (see #01356)
Notes: Under DOS 1.x, DS:BX points at an actual copy of the FAT; later versions return a pointer to a copy of the FAT's ID byte. This function may not be properly supported on CD-ROMs and other installable file systems (use AX=4402h"CD-ROM" for CD-ROMs instead)
BUG: DOS 7.10 (Win95B/Win98) reportedly returns incorrect values in AL and DX for FAT12/FAT16 drives, even though it manages correct results for FAT32 drives (DOS windows are not affected, only real-mode DOS)
(Table 01356) Values for media ID byte: FFh floppy, double-sided, 8 sectors per track (320K) FEh floppy, single-sided, 8 sectors per track (160K) FDh floppy, double-sided, 9 sectors per track (360K) FCh floppy, single-sided, 9 sectors per track (180K)
FAh HP 200LX D:
ROM disk, 16 sectors per track (995K).HP 200LX E:
(Stacker host drive ???) F9h floppy, double-sided, 15 sectors per track (1.2M). Floppy, double-sided, 9 sectors per track (720K,3.5") F8h hard disk F0h other media. (e.g. floppy, double-sized, 18 sectors per track -- 1.44M,3.5")
Category: DOS Kernel - Int 21h - D
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