cliveb Wrote: > My apologies for not explicitly answering your question earlier. On 26th > June opaqueice posted something in response which sort of summed up what > EAC does when it detects an uncorrectable error. I posted a slight > clarification on 27th, and thought that between them those two posts > covered it. But clearly I was wrong to think that, so.... > > Let's consider what happens when a CD has an uncorrectable error, ie. > enough bad symbols in a data block that even after C2 CIRC processing, > they cannot be corrected. When being read by an audio CD player, the > incorrect data is interpolated. In other words, the CD player "makes > up" some replacement data that it hopes will provide a seamless join > between the preceding and following correct data. Very often, such an > interpolation works very well. > > This isn't what EAC does. The reading drive reports an uncorrected C2 > error, and EAC starts re-reading the same block over & over again, in > the hope that the error will go away. But in most cases the error > *doesn't* go away. My experience is that if EAC detects an > uncorrectable error, it rarely pops out the other side of this process > having eliminated it. And the normal result is an audible "tick" in the > extracted WAV file. I have yet to see any evidence that EAC performs > error concealment through interpolation in the way that audio players > do. Even CDROM drives that have error interpolation capability (eg. my > Plextor PX712A) are not utilised fully by EAC. I recently ripped a > brand new CD that had uncorrectable errors, and only Plextools was able > to get a clean result, precisely because it apparently knows how to > instruct the drive to deploy its interpolation algorithm. EAC could not > produce a tick-free result in any mode (secure, fast or burst).
A brand new CD with uncorrectable errors? Was it by any chance "protected" by som idiot-style copy protection scheme? The CD's (if indeed it even is a real CD) sleeve notes should say. -- P Floding ------------------------------------------------------------------------ P Floding's Profile: http://forums.slimdevices.com/member.php?userid=2932 View this thread: http://forums.slimdevices.com/showthread.php?t=24957 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
