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  Description:  Format Drive      [PC]
 
    Formats the entire drive, writing disk address fields and data sectors,
    starting at the specified cylinder.
 
  Input                             Output
  ══════════════════════            ════════════════════════════════════
  AH=07H                            If function successful
  AL=interleave                     Carry flag=clear
  CH=cylinder                       AH=00H
  DL=drive                          If function unsuccessful
     80H-FFH  fixed disk            Carry flag=set
                                    AH=status (see Int 13H Function 01H)
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