I have a problem with this cd, it has one c2 error. The cd don't look scratched at all.

I made two dumps using different versions of DIC

Using dic test_20170816 using c2 command and reread 10k times
Using dic test_20181001 without c2 command
DIC logs and pictures at: https://mega.nz/#F!td5llKaT!ivqN6ZfaJ5DHnw__xVbfXQ

Name: Club Saturn
System: AUDIO
Media: CD
Category: Club Remixes
Region: Brazil
Serial: UMD-51023
Version: Original
Barcode: 6 02435 10232 0

Mastering Code: SONOPRESS UMD51023<tab>5126/97
Mastering SID Code: IFPI L029

2 (edited by reentrant 2018-10-12 17:18:03)

This is known bug in Firmware of Plextor drives. 24 C2 errors in pattern: F0F0F0 0F0F0F.
I have tons of such discs. It cannot be fixed by rereading.

The algorithm is to use different drive and issue DIC data command and patch original image with data read from the other device. There's no other way.

You have to use /c2 on the other drive to be sure. I use 2 different drives, and after making sure the data is equal on both I patch the image.

reentrant wrote:

This is known bug in Firmware of Plextor drives.

All models? or only 716A?

reentrant wrote:

24 C2 errors in pattern: F0F0F0 0F0F0F.

Always same pattern? Club Saturn has ... F0 F0 F0 00 00 00 0F 0F 0F 0F ...

So,

I did another dump using a non-plextor drive and t....p method. There's only a single byte difference in track1 between two methods.
I attached the tracks and t....p logs for analysis.

5 (edited by reentrant 2018-11-03 00:03:04)

> All models? or only 716A?
PX 716 and 760 affected. I don't have any other plextors to test.

> Always same pattern? Club Saturn has ... F0 F0 F0 00 00 00 0F 0F 0F 0F ...
Yes, it's this pattern. Exactly 24 bits are bad.

Keep in mind I have seen discs protected with SafeDisc which gave (288+24 = 312 C2 errors) - ajshell case. Out of those 312 C2 errors 24 bytes are spurious and should not be counted. This is weird. I know.

Did t....p method return any C2 bits?

When I compared bad data returned by my PX drives and correct data returned by non-PX drives, not all bytes marked as C2 were bad. Sometimes some bytes were good. This could be the case with your disc...

> Did t....p method return any C2 bits?

I also dump the cd using t....p and plextor, which got the same result as DIC. t....p only did like 12 c2 reread times.