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EAC T&C without C2. Overkill?
liekloo
post Nov 20 2002, 16:51
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If you rely on C2 info when using EAC, using 'test&copy' is better than just 'copy'.

What if you don't use C2? EAC reads each sector twice and, as a result, has the oportunity to calculate CRC twice, and compare them.


Is that correct? and is the opportunity actually used? (that would mean test&copy is overkill if you disable C2)


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Volcano
post Nov 27 2002, 16:51
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user:

QUOTE
QUOTE
On scratched CDs, I found it impossible to get matching CRCs with this drive - although there were no errors reported for each rip.

Without Test & Copy, I never would have noticed this, so IMHO it is definitely worth using ..


This is typical on scratched CDs, independent of used drive, or brand.


But even with my crappy Acer CD writer I could get matching CRCs on all tracks on one of the scratched CDs. Had that not been the case, I probably wouldn't have worried and would have thought, just like you, that CRC mismatches are perfectly normal for scratched CDs.

There might be an explanation for this - the Acer reported 100% on nearly all tracks, in other words, EAC's error correction never kicked in. On the NEC however, error correction was performed far more often, which leaves more room for minor differences between the reads which aren't audible, but still exist (which a CRC check will, of course, pick up). (I guess that's what you meant with your first point, Pio2001...?)

Anyway, I'm still a little worried about the results of the NEC with Test & Copy.
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Posts in this topic
- liekloo   EAC T&C without C2. Overkill?   Nov 20 2002, 16:51
- - cmyden   What if you don't use C2? EAC reads each secto...   Nov 20 2002, 17:05
- - Annuka   EAC is not exact at all, if your CD-ROM drive is o...   Nov 20 2002, 17:25
- - liekloo   Thanks for your replies To cMyden: (Yes, I s...   Nov 20 2002, 18:16
- - Pio2001   QUOTE (liekloo @ Nov 20 2002 - 06:51 PM)If yo...   Nov 20 2002, 21:48
- - spoon   If I can hijack this thread - I am currently tac...   Nov 20 2002, 23:46
- - liekloo   Could anyone please explain why accurate stream is...   Nov 21 2002, 15:56
- - Case   QUOTE (liekloo @ Nov 21 2002 - 04:56 PM)Could...   Nov 21 2002, 17:15
- - liekloo   I am sorry, I apparently didn't put my questio...   Nov 21 2002, 17:20
- - Case   QUOTE (liekloo @ Nov 21 2002 - 06:20 PM)When ...   Nov 21 2002, 17:24
- - liekloo   So, to conclude: in secure mode, with a properly c...   Nov 25 2002, 19:38
- - liekloo   But what in this situation: A scratched CD... if ...   Nov 25 2002, 19:53
- - liekloo   Of course, if sectors are big enough this is not a...   Nov 25 2002, 20:20
- - Pio2001   The "sectors" re-read by EAC are in fact...   Nov 25 2002, 23:53
- - liekloo   Thank you very much, this is not too bad B) Hyd...   Nov 26 2002, 15:12
- - Volcano   Just my 0.02: Test & Copy without C2 is cert...   Nov 26 2002, 22:42
- - liekloo   If Volcano's EAC is correctly configured (cach...   Nov 27 2002, 09:38
- - liekloo   QUOTE I found it impossible to get matching CRCs w...   Nov 27 2002, 09:43
- - user   " On scratched CDs, I found it impossible to ...   Nov 27 2002, 10:16
- - Pio2001   QUOTE (Volcano @ Nov 27 2002 - 12:16 PM)...   Nov 27 2002, 15:01
- - Pio2001   By the way, this thread is interesting : (http://w...   Nov 27 2002, 15:10
- - Pio2001   I forgot : http://www.digital-inn.de/showthread.ph...   Nov 27 2002, 15:48
- - user   For all these reasons and uncertainty, checking in...   Nov 27 2002, 15:56
- - Volcano   user: QUOTE QUOTE On scratched CDs, I found it im...   Nov 27 2002, 16:51
- - user   " But even with my crappy Acer CD writer I co...   Nov 27 2002, 17:07
- - Pio2001   QUOTE (user @ Nov 27 2002 - 07:07 PM)hmm, Hal...   Nov 27 2002, 22:28
- - Volcano   Pio2001: QUOTE QUOTE which leaves more room for m...   Nov 28 2002, 16:23
- - liekloo   QUOTE VOLCANO: My question is, is that theory righ...   Nov 28 2002, 17:18
- - liekloo   In fact Pio2001 already answered the question: In...   Nov 30 2002, 12:18
- - spoon   Here is what I have found on ripping audio CDs - ...   Nov 30 2002, 22:47
- - liekloo   T&C should also help to verify whether your dr...   Dec 4 2002, 09:33
- - Pio2001   QUOTE (liekloo @ Dec 4 2002 - 11:33 AM)***Abo...   Dec 4 2002, 12:39
- - liekloo   QUOTE (Pio2001 @ Dec4 12:39)So it's not 1...   Dec 5 2002, 10:12
- - liekloo   Tests have been done meanwhile, and a conclusion i...   Apr 23 2003, 20:49


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