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  Description:  Get Drive Allocation Information
 
  Obtains selected information about a disk drive, from which the drive's
  capacity and remaining free space can be calculated.
 
  Input                                    Output
  ═════════════════════════════            ═══════════════════════════════
  AH=36H                                   If function successful
  DL=drive code (0=default, 1=A,           AX=sectors per cluster
     etc.)                                 BX=number of available clusters
                                           CX=bytes per sector
                                           DX=clusters per drive
                                           If function unsuccessful (drive
                                            invalid)
                                           AX=FFFFH
                                    -♦-