CD-ROM XA

Optical discs
Optical media types
Standards
See also

CD-ROM XA is an extension of the Yellow Book standard for CD-ROMs that combines compressed audio, video and computer data, allowing all to be accessed simultaneously. It was intended as a bridge between CD-ROM and CD-i (Green Book) and was developed by Sony and Philips. "XA" stands for eXtended Architecture.

CD-ROM sector types:

  1. Audio (2352):
    Data (2352)
    Raw data, no ECC; used for audio.
  2. Mode 1 (2048):
    Sync (12), Address (3), Mode (1), Data (2048), EDC (4), reserved (8), ECC (276)
    2048 bytes of user data with error correction; usually used for computer data.
  3. Mode 2 (2336):
    Sync (12), Address (3), Mode (1), Data (2336)
    2336 bytes of user data, no ECC; usually used for compressed audio, video or picture.

CD-ROM XA defines two forms of Mode 2 sectors:

  1. Mode 2 Form 1 (2048):
    Sync (12), Address (3), Mode (1), Subheader (8), Data (2048), EDC (4), ECC (276)
    2048 bytes of user data, ECC, can interleave with Mode 2 Form 2 sectors; used for data.
  2. Mode 2 Form 2 (2324):
    Sync (12), Address (3), Mode (1), Subheader (8), Data (2324), EDC (4)
    2324 bytes of user data, error detection, can interleave with Mode 2 Form 1 sectors; used for audio/video data.

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References