Re: Layer separation and disc defects
OK, I feel dumb right now. I apologise Skywise for providing some misleading information.
Yes, C1/C2 errors are for CD and PI/PIF/POF are for DVDs. It is an analogous relationship and they conceptually boil down to the same things:
C1 -> PI/PIF (PIF is actually just a large concentration of PI errors)
C2 -> POF
Internally I think of C2 as the same as POF (parity outer failure) and in my head I use the terms interchangeably.
All CDs will have some C1 errors, and all DVDs will have some PI/PIF errors. They are soft errors corrected within the drive and it is always normal to have some. In most cases, only C2 and POF indicate physical problems.
As to the C2 error reporting item in Nero Infotool, that actually has me a little confused: Infotool reports that my Pioneer 106S supports reporting C2 errors, but in reality it can only report POF for DVD media but cannot report C2 for CD media. This makes me suspect that for DVD drives, the C2 field actually reports whether or not it is POF-capable.
It is true that not all error types are reportable by all drives. To my knowledge only Lite-on DVDRw drives and Plextor DVDRw PX-712A and above will report all types. Though some argue that it is misleading for a DVD reader to report C1 or C2 errors on CDs because DVD drives can read CDs much more 'finely' than they were designed to be read.