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CD-R and Audio Hardware => CD Hardware/Software => Topic started by: /\/ephaestous on 2003-03-04 02:35:42

Title: How to scratch a disc?
Post by: /\/ephaestous on 2003-03-04 02:35:42
Have anyone got any idea about how to scratch a disc so:

It can be ripped by EAC but rereading a lot.
When it's read twice in secure mode it gives the same crcs.

I have tried many ways but it's either a perfect rip (q 100%) or differents Crcs for each rip.
I just wanted to measure how accurate is my drive regarding C2 errors.

Thx
Title: How to scratch a disc?
Post by: F1Sushi on 2003-03-04 03:57:20
http://www.exactaudiocopy.de/eac13.html (http://www.exactaudiocopy.de/eac13.html)
Title: How to scratch a disc?
Post by: /\/ephaestous on 2003-03-04 04:24:05
THx
Title: How to scratch a disc?
Post by: Xenion on 2003-03-04 16:00:39
just give the cd one week to me 
Title: How to scratch a disc?
Post by: dgover2 on 2003-03-04 17:35:54
What drive do you have? As far as I've read theres only 3 drives known to give 100% accurate C2. One is the Lite-On 52246S, another one is something weird like Cendyne, maybe a rebadged Lite-On anyway and the other a certain Toshiba model.

Sorry I can't remember much more than that
Title: How to scratch a disc?
Post by: Sachankara on 2003-03-04 17:40:14
Quote
Have anyone got any idea about how to scratch a disc so:

It can be ripped by EAC but rereading a lot.
When it's read twice in secure mode it gives the same crcs.

I have tried many ways but it's either a perfect rip (q 100%) or differents Crcs for each rip.
I just wanted to measure how accurate is my drive regarding C2 errors.

Thx

Put it on the floor and "gently" use your foot to scratch it against the floor in circular movements... Worked just fine for me...
Title: How to scratch a disc?
Post by: Pio2001 on 2003-03-04 19:45:08
Quote
As far as I've read theres only 3 drives known to give 100% accurate C2.

CDRinfo C2 tests simulates light errors. Drives can loose their C2 accuracy as the error rate grows.

http://www.digital-inn.de/showthread.php?t...14640#post60894 (http://www.digital-inn.de/showthread.php?threadid=14640#post60894)
Title: How to scratch a disc?
Post by: /\/ephaestous on 2003-03-04 20:33:25
Interesting...

I guess I'll leave C2 off since I created a test disc and both had problems but C2 didn't report any..
Title: How to scratch a disc?
Post by: Pio2001 on 2003-03-04 22:24:14
By the way, with the DAEQuality package, there is no need to get all errors corrected. You can damage the CD until it gets unrecoverable errors.
The program just checks that the drive reports a C2 error for every difference between the reference file used to burn the CD and the rip.
Title: How to scratch a disc?
Post by: /\/ephaestous on 2003-03-04 22:56:53
I understand that.

The DAEQuality test says 99% but when ripping a scratched test cd C2 doesn't work well it says 100% quality while in No C2 it reports a read error.
Comparing the rips with the original rip (before scratching the disc) shows errors where the are pointed in No C2 mode in both waves (C2 On and C2 Off).

So I guess I'm better of not using C2 at all. I mean the point of EAC is to be certain if there were errors, so even if it's 99% corrected it doesn't give me the warm-fuzzy feeling
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