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  Description:  Get Default Drive Data
 
  Obtains selected information about the default disk drive and a pointer
  to the media identification byte from its file allocation table.
 
  Input             Output
  ══════            ═══════════════════════════════════════════════════
  AH=1BH            If function successful
                    AL=sectors per cluster
                    DS:BX=segment:offset of media ID byte
                    CX=size of physical sector (bytes)
                    DX=number of clusters for default drive
                    If function unsuccessful (invalid drive or critical
                     error)
                    AL=FFH
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