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  This service, like service 06H, is supported only in the PC/XT fixed-disk
  ROM BIOS. It formats the entire fixed-disk drive, starting at the cylinder
  number specified in CH and CL. Register parameters for service 07H are the
  same as for service 05H (Figure 10-3), except that register AL contains a
  sector interleave value and no head number need be specified in register
  DH.