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  Description:  Reset Fixed Disk System      [PC] [AT] [PS/2]
 
  Resets the fixed disk controller, recalibrates attached drives (moves the
  read/write arm to cylinder 0), and prepares for subsequent disk I/O.
 
  Input                            Output
  ═════════════════════            ════════════════════════════════════
  AH=0DH                           If function successful
  DL=drive                         Carry flag=clear
     80H-FFH fixed disk            AH=00H
                                   If function unsuccessful
                                   Carry flag=set
                                   AH=status (see Int 13H Function 01H)
                                    -♦-