Mode details
  All sectors contain 2352 bytes.

  All sectors contain a 16 byte preamble.
    1st 12 bytes used to signal beginning of sector.

    Next 3 bytes are sector ids - 2^24 or 16 million sectors.

    Last byte contains the Mode type.

  Mode 1 - contains 2048 bytes of data and 288 byte ECC field.

  Mode 2 - contains 2336 bytes of data and no ECC field. Analog (music)

  Only about 28-30% of data on disk is user data.