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        Format track


        For floppydisk drives:
          Entry:
            AH = 05h
            AL = number of sectors to create on this track
            CH = track
            CL = sector
            DH = head
            DL = drive
            ES:BX = pointer to array of 4-byte address fields

               byte 1 = track
               byte 2 = head
               byte 3 = sector
               byte 4 = bytes/sector  0=128, 1=256, 2=512, 3=1024

          Return:
            CF set if error occurred
            AH = status code (see AH=1 above)

        For harddisk drives:
          Entry:
            AH = 05h
            AL = interleave value (XT only)
            ES:BX = 512-byte format buffer
                    the first 2*(sectors/track) bytes contain F,N for each sector
                       F = 00 for good sector, 80h for bad sector
                       N = sector number
            CH = cylinder number (bits 8,9 in high bits of CL)
            CL = sector number
            DH = head
            DL = drive
          Return:
            AH = status code (see AH=1 above)