cliveb;146116 Wrote: > The error correction on CDs is cross-interleaved Reed-Solomon code, and > it's actually *more* sophisticated than ECC used in some (more > expensive) computer RAM. Both red book and yellow book use the same > CIRC strategy; the difference is that yellow book uses more of each > block for redundant error correcting data. This is because, while the > odd uncorrectable error on an audio CD can be interpolated, on a data > CD it's utterly fatal. (And hence the reason why on a 80min blank CDR > you can store 700MB when written in data format, but 800MB when written > in audio format).
It's been about 15 years since I was familiar with this stuff, but my fuzzy memory was that Yellow Book format (CD-ROM) did indeed include EDC/ECC. So I went back to the ecma version of Yellow Book to check: http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-130.pdf It does have EDC/ECC. As Clive says, both Red Book and Yellow Book use CIRC (Cross Interleaved Reed-Solomon Code), but in the data version of Yellow Book discs, a block of each data sector is allocated to EDC/ECC info for additional error correction. Page 15 says: a Sector Mode byte in byte position 15. The setting of this byte shall be as follows: If set to (00) : This shall mean that all bytes in positions 16 to 2 351 of the Sector are set to (00). If set to (01) : This shall mean that all bytes in positions 16 to 2 063 are user data bytes and that the bytes in positions 2 064 to 2 351 are set according to 14.3 to 14.6 below. Thus the user data is protected by EDC, ECC and CIRC. -- pvadbx ------------------------------------------------------------------------ pvadbx's Profile: http://forums.slimdevices.com/member.php?userid=5719 View this thread: http://forums.slimdevices.com/showthread.php?t=28621 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/lists/listinfo/audiophiles
