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