[Paranoia] Audio data varies from drive to drive?

[Paul C. Bryan]

On Tue, 2010-02-09 at 14:46 -0800, Laurent Charrière wrote:
> Hi,
> 
> Out of curiosity I ripped the same track on three different 
> CDROM-drives, for two different discs. Each time I used the command 
> "cdparanoia 1". The ripping went with no error in each case.
> 
> I noticed that the resulting cdda.wav files are different from drive to 
> drive. When I look at the files in vbindiff I can see that the 
> differences are scattered throughout the files. For example at a given 
> offset, one file will have a byte value of 0x00, the other will have 
> 0x01 -- the differences seem to be small, although I have seen sometimes 
> 0xff instead of 0x00.

Just to rule out something obvious:

1. Are the sector offsets for these drives identical?
2. Is the disc in perfect condition?
3. Is this a true CDDA disc (it has a CD Digital Audio logo)?

Paul

> 
> I would expect the audio data to be identical regardless of the drive 
> which does the reading. Am I doing something wrong?
> 
> I'm happy to provide the drive specs if you need them.
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