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  Description:  Absolute Disk Write
 
  Provides a direct linkage to the MS-DOS BIOS module to write data from
  memory to a logical disk sector.
 
  Input                                     Output
  ══════════════════════════════            ══════════════════════════════
  For access to partitions                  If function successful
   <= 32 MB                                 Carry flag=clear
  AL=drive number (0=A, 1=B,                If function unsuccessful
   etc.)                                    Carry flag=set
  CX=number of sectors to write             AX=error code (see Notes)
  DX=starting sector number
  DS:BX=segment:offset of buffer
  For access to partitions
   > 32 MB (MS-DOS 4.0 and later)
  AL=drive number (0=A, 1=B,
   etc.)
  CX=-1
  DS:BX=segment:offset of para-
   meter block (see Notes)
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