> Just curious, what is C1/C2 error on recorded cds?
> how bad are they?
The red book gives a BLER limit (C1 correctable+uncorrectable
errors) of 220/s, but nowadays good drive+media combination
should give you below 50. For some practical figures, try
http://www-user.tu-chemnitz.de/~noe/Lit ... x-eng.html
> Also, in CD Doctor, in the generated graph, what
> does the values in the legend of C1 and C2 represent?
It can indeed be several things, so I asked the same question
in the CDDoctor thread few days ago, but nobody seems to know
the answer.
> I ran CD Doctor twice, one at 8X and the other at
> MAX, I get two different results, one (8X), I get
> no C2 error, but at MAX, I get a C2 error that is
> like at max 142 and a C1 error max of 53 (much higher
> than the C1 error at 8X). why is the result somewhat
> different?
C1 and C2 errors are not physical defects on the disc,
but errors calculated from the bits read on the disc.
And detecting bits correctly is more difficult at high
speeds than at low speeds, so for the same disc you
usually get more C1/C2 errors at 40x than at 8x : in
this case errors are not due to the disc, but to the
drive. This is why media or burning quality comparisons
must always be done at fixed speeds.
