i just found a old cd of mine. burnede before i knew anything about c1/cc2 scanning.
now several years later i scan anything newly burnede og if the disc is old.

This cd particullar cd has c2 erros on it.

Nereo CD/DVD speed 4.10:

C1 errors
Avareage: 1.46
Maximum: 25
Total: 6469

C2 Errors:
Average 0.09
Maximum: 97 (Cr#p)
Total: 403

now i wish to reburn the disc so that the data is recovered and getting new CRC data.

HOWEVER
i dont know if C2 errors is errors correctede by the C2 layer or if it is errors unccorectable by the C2 layer ?

As far as i understand you have 2 correctioen layers with some scrambling in between.

So you could have:
- Sector without errors
- sector with errors corrected by C1
- sector with errors failed by C1 but corrected with C2
- Sector failed both C1 and C2

so which is c1 erros and which is c2 errors ?

would it help to reburn from the "damagede" medie ? it contains bot data and audio (its a game)



Optional question:
is there something like S.M.A.R.T for cd'es ?
Some utility in the bacgkround the woulf read C1/C2 errors informaiton while reading from the CD

C2 terminology is a bit confusing; It depends on the drive and program what counts as "C2 errors" (there are several types of C2/CU errors which may or may not be correctable).

For data discs: If Windows can copy it to your hard disk without complaining about read errors, you are fine and can burn it to a new disc.

For audio discs: more difficult to find out. You'd have to use EAC in secure mode (or test&copy), and if it manages to extract everything without errors, you can re-burn it. Given the still low amount of C2 errors, I'd guess you'll succeed in rescuing the disc, but EAC might need a few re-reads in some places.

i tried making a scandis with nero cd/dvdspeed
it show to squares in red (bad)

however if i make a image with nero, read in no-raw mode.
mount ti with demon tools
The two red squares move position ???

I would look at it this way: So many C2 errors might mean the disk is going bad. If you have no other source and want the music, it might be good to rescue the contents. Extract with EAC secure mode, as that will probably give you the best extraction you can get. Also, you might get way better results with another drive, so if possible you should try that too.

Listen to the extracted files, especially where EAC tells you it had problems (assuming it does, of course). Do they sound alright? If not, can you improve them (e.g. remove clicks)? If you can get tracks that sound good enough, write them to a new CD-R. Now you shouldn't lose your music any time soon.

403 C2s is nothing for a good drive, like a Plextor or BenQ.

It would. If you can copy the files via Explorer without errors, you got the data. If you cannot, try ISObuster. EAC in Burst mode with Test & Copy will take care of the audio.

Then burn the audio as the first session, and the files as the second. The resulting CD may not be an exact replica of the old CD-R, but it will be more than good enough.

It would also really help, Bent, if you put a little care in typing. Your posts are so ridden with typos and misspellings, they are almost unreadable.

In a word, no.

CUs are uncorrectable by definition.