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  Service 0AH (decimal 10) reads, and service 0BH (decimal 11) writes,
  "long" sectors on PC/AT or PS/2 fixed disks. A long sector consists of a
  sector of data plus a 4- or 6-byte error correction code (ECC) that the
  fixed-disk controller uses for error checking and error correction of the
  sector's data. These services use the same register parameters as parallel
  services 02H and 03H.

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  NOTE:
    The IBM BIOS Interface Technical Reference Manual states that services
    0AH and 0BH are "reserved for diagnostics," so stay away from these
    services unless you have a very good reason for using them.
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