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  Description:  Format Bad Track      [PC]
 
  Initializes a track, writing disk address fields and data sectors and
  setting bad sector flags.
 
  Input                             Output
  ══════════════════════            ════════════════════════════════════
  AH=06H                            If function successful
  AL=interleave                     Carry flag=clear
  CH=cylinder                       AH=00H
  DH=head                           If function unsuccessful
  DL=drive                          Carry flag=set
     80H-FFH  fixed disk            AH=status (see Int 13H Function 01H)
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