X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos 2+

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INT 21 - DOS 2+ - GET DISK SPACE
        AH = 36h
        DL = drive code (0 = default, 1 = A, 2 = B, etc.)
Return: AX = number of sectors per cluster
             or FFFFh if invalid drive
        BX = number of available clusters
        CX = bytes per sector
        DX = total clusters
Notes:  multiply AX * CX * BX for free space on disk
        multiply AX * CX * DX for total disk space
        according to Dave Williams' MSDOS reference, the value in DX is
          incorrect for non-default drives after ASSIGN is run
SeeAlso: AH=1Bh,AH=1Ch

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