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  Description:  Reset Disk System      [PC] [AT] [PS/2]
 
  Resets the disk controller, recalibrates its attached drives (the read/
  write arm is moved to cylinder 0), and prepares for disk I/O.
 
  Input                            Output
  ═════════════════════            ════════════════════════════════════
  AH=00H                           If function successful
  DL=drive                         Carry flag=clear
     00H-7FH floppy disk           AH=00H
     80H-FFH fixed disk            If function unsuccessful
                                   Carry flag=set
                                   AH=status (see Int 13H Function 01H)
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