(Alexnoe, spath, feel free to move this thread to the newbie forum or wherever you think appropriate if you don’t think it belongs here.)
The reason for my query is the recent release of a new version of the cdrdao burning engine which supports raw reading and writing of rw subs but, strangely, not the pq subs.
OK, now my understanding is that, ignoring atip checks and whatever nightmare method of “verifying” an original cd that may have been used on NWN 1.21 and 1.22, securerom uses the pq subchannels (so a raw + 16 byte write is sufficient to duplicate the relevant subchannel data). However, since cdrdao doesn’t support pq subs, it can’t duplicate the protection even with a full raw read and raw dao96 write (my tests confirm this to be the case).
Cd-text, on the other hand, appears to be stored in the rw subchannels and can be duplicated by the latest version of cdrdao even though pq subs aren’t supported (again my tests confirm this).
As for kareoke cds, I don’t have any to test (and have no intention of ever buying one ) but my understanding has always been that a full raw dao96 read and write is necessary to duplicate them. However, a couple of sites I looked at after a google search seemed to indicate that the relevant subs were contained in the rw subchannels. Is this so? (If it is then there doesn’t seem to be any reason why a kareoke cd can’t be duplicated by cdrdao notwithstanding its lack of support for the pq subs.)
Finally, libcrypt protected psx. Again, I’ve always understood that a full raw dao96 read (at least of the data track) and write are necessary to duplicate these cds. Given that libcrypt was developed by sony (as was/is securerom), I would assume that the pq subs are used, presumably in addition to some of the rw subs given that a dao96 write is required, but I wasn’t able to confirm this by searching the net generally (and a search of this forum was stymied by the search function not accepting 2 letter terms like pq, rw or pw). Which subs are actually used with this protection? (Again, if pq subs aren’t used, duplication with cdrdao should be possible.)