Read errrors with Plextools



I have Plextor Premium drive and the latest version of Plextools. When
I used the DAE feature on one of my discs, one of the tracks kept
returning errors, even after several applications of hand glaze.

According to the Plextools manual, these read errors are uncorrectable
and are “based on the C2 flag that is read together with the audio
data.” I thought C2 errors are correctable. Are these in fact CU
errors? I ended up with about 400-500 of these errors for the track
in question. When I burned a copy of it, I couldn’t hear any clicks or
pops, as I thought I would with CU errors.

If they are CU errors, somebody sent me a link a while back in another
posting about E32 (CU) errors. In an article on it said
"There are some drives that can correct even up to four bad symbols at
the second stage. However for the majority of the tests, we consider
E32 an uncorrectable error, even though some drives may be able to
correct it. The quality of our recorded media will decrease with
regular use and aging. Discs with already E22 or E32 will not leave
adequate margin for future degradation.

Uncorrectable errors may not be a problem on audio discs, since the
player’s interpolation circuitry will hide these errors. Some players
can interpolate up to eight consecutive bad samples."

So, if even CU errors are able to be compensated for via
interpolation, there is likely a difference between the original track
(on a brand new CD) and the one I have now. It just may be I don’t
hear the difference because the interpolation circuitry did a good
job. Is that right?

At what point would there appear pops and skips in a track? After a
couple thousand CU errors? Also, that article I mentioned says some
players can interpolate up to eight consecutive bad samples. How many
errors make up a sample?

I am trying to get a better understanding of errors and their effects
on playback. I appreciate the help.