Quote:
Originally Posted by Quoth
CD to CD is only 1:1 for CD-ROM, not CD-Audio as audio has no error correction, though mostly the results are better than analogue tape and very many more generations are possible.
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Not exactly. CD-DA (Digital Audio) does have error correction but it's only two rounds of Reed-Solomon coding which is sufficient for single bit errors. Full error correction requires three rounds of RS coding. CD-ROM uses three rounds.
You can get bit-perfect copies of CD-DA, down to the offsets and subchannel metadata. The drive firmware needs to know how to do it but it is very possible if the media isn't too badly damaged, and is a sought-after feature for anyone looking to rip their music library. I have owned three such drives: an old Lite-On CD-ROM drive which I think I no longer have, a drive from LG which I picked up specifically for backing up my Saturn and PlayStation libraries (ReDump approved), and a Philips Blu-ray drive as a backup for the LG.
Plus the AccurateRip database exists.