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Sort of - sometimes there's sub-channel data that is very hard to properly replicate; only certain drives even expose that data to correctly extract. Making pe
by optimiz3 7y ago
Sort of - sometimes there's sub-channel data that is very hard to properly replicate; only certain drives even expose that data to correctly extract. Making perfect audio CD image archives is surprisingly hard.
E: Specifically I'm talking about the P & Q channels, but this can also include R through W which while technically unused, still contain data in some form.
- paublyrne 7y agoWhat do you mean by "sub-channel"?
- LegitShady 7y agohttps://superuser.com/questions/1189222/cd-rom-subchannel-is-different-when-dumping-the-same-disc https://superuser.com/questions/1189222/cd-rom-subchannel-is... more information here
- optimiz3 7y agohttps://en.wikipedia.org/wiki/Compact_Disc_subcode https://en.wikipedia.org/wiki/Compact_Disc_subcode Most audio CD extractors do not provide all of this channel data, as only the digital audio is extracted. When a CD is re-burned, the subchannel data is regenerated, but not a bit-for-bit copy of the original. Sounds the same (usually), but sometimes there is metadata, easter-eggs, and what-not that is omitted. Additionally, some copy protection relied on adding corrupted subchannel data which low end CD players would skip, but high end extractors would not. Having the original subchannel data can be key and necessary to determine whether a sector was infact incorrectly extracted or not.