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EAC C2 error correction, Use it or not?
RiskyP
post May 29 2003, 22:56
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My drive supports C2 error correction and I have been using it always since it gives the fastest rips for me, while still no errors are reported and all track qualities are above 99.5%. Using this option, I get rip speeds of 18x and I was wondering whether C2 error correction is really that reliable? I mean, I never get error messages, the track quality is always reported to be over 99.5% and I cannot hear any audible difference. Is there any incentive NOT to rip at 18x under these conditions?! Btw, my drive is a LiteOn 48x CDRW (I can't remember the model name off the top of my head)
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Pio2001
post May 30 2003, 19:35
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I meant that if you turn C2 on, then test and copy a CD, and get the same CRC, it doesn't prove anything. It is even likely to happen if your drive have no C2 support at all ! It is common to get a correct extraction with a good CD, thus CRC OK.
So you can't say that if you get CRC OK on a C2 rip, your drive have perfect C2 support.

On the other hand, if you manage to get a "copy OK" with a lot of error correction, there will probably be 10,000 C2 detected errors, for example. Then if you get CRC OK, it means that all of the 10,000 errors were detected, thus that your drive have 99.99 % C2 accuracy.

Atici, Tigre's recent tests proves that the no C2 setting doesn't give perfect results either.
Of course you get CRC mismatches only when C2 is on, because a "no C2 mode" failure means a consistent error, that is twice the same wrong CRC !
thus the CRC method can't be used to test the secure mode accuracy, since CRC comparison is the same as readig twice. Either they both succeed, either they both fail.
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Posts in this topic
- RiskyP   EAC C2 error correction   May 29 2003, 22:56
- - atici   Compare the CRCs of your reads with and without C2...   May 29 2003, 23:01
- - Pio2001   This CRC method only works for tracks with errors ...   May 30 2003, 00:26
- - RiskyP   I could not find info on cdrinfo.com but thanks fo...   May 30 2003, 16:17
- - RiskyP   This is a bit off topic, but how much do you think...   May 30 2003, 17:13
- - liekloo   QUOTE (Pio2001 @ May 30 2003 - 12:26 AM)This ...   May 30 2003, 18:21
- - atici   You may want to check this thread about the setti...   May 30 2003, 18:24
- - Pio2001   I meant that if you turn C2 on, then test and copy...   May 30 2003, 19:35
- - atici   Yes, you're right! I knew that. But that...   May 30 2003, 19:52
- - Pio2001   I don't know, I still must verify Tigre's ...   May 30 2003, 19:56
- - atici   But wasn't it you who said when you unset ...   May 30 2003, 20:49
- - Pio2001   When C2 is unset, the drive doesn't take C2 in...   May 31 2003, 01:09
- - liekloo   QUOTE (Pio2001 @ May 30 2003 - 07:35 PM)I mea...   May 31 2003, 21:36
- - atici   @liekloo : I think you're too much of a stickl...   May 31 2003, 23:03
- - Pio2001   QUOTE (atici @ Jun 1 2003 - 01:03 AM)I trust ...   Jun 1 2003, 01:25
- - atici   QUOTE a) 990 not repeatable and detected by C2. b...   Jun 1 2003, 06:22
- - westgroveg   If someone was to test the C2 info of their CD-ROM...   Jun 1 2003, 06:48
- - liekloo   QUOTE (atici @ May 31 2003 - 11:03 PM)the kin...   Jun 1 2003, 16:32
- - Pio2001   QUOTE (atici @ Jun 1 2003 - 08:22 AM)I think ...   Jun 1 2003, 18:41
- - moikboy   If i rip with c2, i rip the data twice, and compar...   Feb 6 2008, 21:52
- - greynol   Whoa, resurrection of a 4.5 year old thread! ...   Feb 6 2008, 22:08
- - Shamray   Hello! "CD ROMs are like audio CD with ...   Mar 30 2011, 07:36
|- - pdq   QUOTE (Shamray @ Mar 30 2011, 02:36) Hell...   Mar 30 2011, 13:53
- - JunkieXL   Sheesh... what's with the random resurrection ...   Mar 30 2011, 21:13
|- - mjb2006   The first revival of the thread was on topic and m...   Mar 30 2011, 22:35
- - greynol   My last post was a bit difficult to follow if take...   Mar 30 2011, 22:55


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