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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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user
post Nov 27 2002, 15:56
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For all these reasons and uncertainty, checking in eac capabilty of c2 is not recommended, if your drive should be able to.
Let's see your test results !


hmm, Halcyons test, was carried out with a special test-CD, with black stripes on it ?

Is this very realistic, or was that Sony drive so bad ?

Anyways, many thanks for reminding these test of halcyon, I remember having read it.


I have never denied the addition of safety, if you do t&c, but the question is, how much worth is this extra safety (hmm, you are just reading 2 times again by t&c, but eac has had the chance to read it 82 times in the first (or only) run..) ?
(btw, I am always talking of settings NO c2 in secure mode, c2 is not matter of interest for 'users', until there would be new results... (and they would be dependent to brand of drive etc.))

The question is:

How big is the probability, that eac reads twice (no c2, secure) and thinks: no error, all is well, but it has read twice the same wrong value for that damaged sector.

This probabilty depends on size of sector.

Is there an answer ?

(I know, the theoretical safety of c2 error detection is in theory higher than that reading twice method....)


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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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