X-Hacker.org- Ralf Brown's Interrupt List (Part 1,2) - int 21 - dos - get allocation table information for specific drive

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INT 21 - DOS - GET ALLOCATION TABLE INFORMATION FOR SPECIFIC DRIVE
        AH = 1Ch
        DL = drive number to check (0=default, 1=A, etc)
Return: DS:BX -> FAT ID byte for specified drive
        DX = number of allocation units on disk
        AL = number of sectors per allocation unit (cluster)
        CX = number of bytes per sector
Note:   under DOS 1.x, DS:BX points at an actual copy of the FAT
SeeAlso: AH=1Bh,AH=36h

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