Judging C2 Implementation

[comp1mp]

If you search for C2 it returns no results. I hope these questions have not already been answered.

I noticed in the documentation for secure ripping that there was this idea of well versus poorly implemented C2. I am assuming that the C2 test simply reports what the drive tells it. It can't tell if its good or bad C2.

How do I know if my drive has quality C2?

If it is not possible to know, doesn't using C2 risk rips that report as secure but are full of errors?

Thanks,
Matthew

[Spoon]

Re: Judging C2 Implementation

Determining c2 quality is difficult, if in doubt use the ultra passes as you have c2 and verification also, best of both worlds.

[bhoar]

Re: Judging C2 Implementation

Determining c2 quality is difficult, if in doubt use the ultra passes as you have c2 and verification also, best of both worlds.

Yes, difficult. I have three drives on my bench that support c2 which give vastly differing counts of c2 flags per track on the same heavily damaged disc (e.g. 2000, 800, 200 for the same track).

Noone has gone out and really done an intensive analysis of c2 flag support over different model drives.

I'd need to a) create a several test discs of the same pressing with different kinds of damage and b) have a test environment set up to perform post-rip result track to result track data cross-checking before I'd be comfortable making strong recommendations.

I say all of the above since I recently noticed one of the current recommended good-ripping drives (in the Samsung SH-S20x series) generates way more C2 flags than the more current replacement model (in the Samsung SH-S22x series). That, in addition to spoon's current AccurateRip drive comparison results (which give widely differeing results for sub-models of the Samsung SH-20x family)...leads to the possibility that you can't simply assume the more C2 flag errors generated the better. Some drives may be setting C2 flags on sub-frames that are actually correct. Alternately, one level of the error correction code might not be implemented correctly and damage-adjacent sub-frames that should be easy to construct are returned as bad, but flagged, data.

-brendan

[comp1mp]

Re: Judging C2 Implementation

I am sure you have looked at it already...

Nero CD-DVD Speed: Advanced DAE Error Correction Test does not provide an accurate test?

[Spoon]

Re: Judging C2 Implementation

Not in my view.