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Int 21 Fn 1C - DOS 1+ - Get Allocation Information For Specific Drive [D]
AH = 1Ch
DL = drive (00h = default, 01h = A:, etc)
Return: AL = sectors per cluster (allocation unit), or FFh if invalid drive
CX = bytes per sector
DX = total number of clusters
DS:BX -> media ID byte (see AH=1Bh)
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
on a DBLSPACE drive, the total number of clusters is based on the
estimated compression ratio
See Also: AH=1Bh,AH=36h
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