I've seen a variety of comments in this thread which could do with a little bit of clarification:
> If you use secure mode it re-reads everything, which is why it's so slow > when set up properly. Most drives these days are capable of reporting C2 errors, and in those cases EAC doesn't re-read - even in secure mode. It only re-reads when the drive reports a C2 error. > The plextor system is great because the hardware and software already > know what to expect from the other. They do indeed. And the error concealment algorithms in Plextor drives' firmware is usually very good - often better than those in quite high-end CD players. If you have a Plextor drive, then you should use Plextools rather than EAC. I've not found a way to configure EAC so that the Plextor drive can deploy its error concealment - if anyone has, I'd be very interested to hear how it's done. > Error correction isn't guessing, it's using additional data on the disk > to fix missing data perfectly. Error *concealment* is when a drive has > to "make up" data by interpolation. Agreed. However... > Only damaged disks require concealment Not sure exactly what you mean by "damaged", but if you are talking about scratches and the like, these aren't the only ones that need error concealment. In my experience, the majority are not as a result of scratches, but that the CD was originally pressed with uncorrectable errors from the start. Most of the CDs I've seen with uncorrectable errors look absolutely pristine - they are just badly made. > most disks require error correction but are bit perfect after > correction. *All* CDs require C1 corrections, typically on every sector. It's in the nature of the beast. > EAC may have an advantage on damaged disks, but it too will resort to > concealent if it can't read the data. Are you sure that EAC has error concealment? My understanding is that if it fails to get a clean read, it leaves the data in whatever state it found it. > I'd agree with that - roughly 30%+ of my (well looked after) disks > needed some correction - not concealment. a small minority - I'd say > about 10-15 out of over 2,000 - fell into the concealment bucket. As I mentioned above, *all* CDs need error correction. The 30% of your discs you report as needing correction are presumably those that experienced some sort of C2 failure and which EAC chose to re-read. I agree with your figure re. the proportion of discs that end up with uncorrectable errors. I'd say that out of the 1100 or so CDs I ripped, about a dozen were in that category. -- cliveb Performers -> dozens of mixers and effects -> clipped/hypercompressed mastering -> you think a few extra ps of jitter matters? ------------------------------------------------------------------------ cliveb's Profile: http://forums.slimdevices.com/member.php?userid=348 View this thread: http://forums.slimdevices.com/showthread.php?t=32212 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
