[sdiy] OT: Scratchy CDs

[ASSI]

On Monday 22 September 2003 17:44, ChristianH wrote:
> What worries me is the thought of CDs not being as durable as we all
> wish they were. And it makes me wonder about long term CD-ROM
> reliability as well.

The error correction process for an audio CD is rather complicated and 
as you found out, when all else fails, the drive will output the last 
known good sample in the absence of any better information. BTW, this 
produces very characteristic clicks in the sound that to me sound 
nothing at all like vinyl scratches. I have quite a bunch of original, 
new CD that don't play cleanly in some or all of the CD players. Only 
one of them has scratches, all the others are slightly non-centric or 
appear to be producd with warped or worn masters. After not having much 
luck swapping them for good copies, I've read them all in using 
CDParanoia(*), burned them to CD-R and the problems have gone for good. 

(*) This program will read the raw data multiple times in overlapping 
fashion to reconstruct the CD content most faithfully.


Achim.

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