CD-ROM XA
Appearance
![]() |
Optical discs |
---|
![]() |
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:
- Audio (2352):
Data (2352)
Raw data, no ECC; used for audio. - 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. - 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:
- 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. - 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.
Bibliography
- McFadden, Andy (2002-12-20). "What is XA? CDPLUS? CD-i? MODE1 vs MODE2? Red/yellow/blue book?". CD-Recordable FAQ. Retrieved 2008-05-04.
- Sony Storage Support - What are CD-ROM Mode-1, Mode-2 and XA?