If I rip the same CD track to a .wav file with CDex 1.40 under both Windows 98SE and Windows 2000, I get two files with exactly the same size. A binary comparison with "fc /b" shows the two files to be different. Can anyone explain why this is so? I would have expected them to be identical when both are ripped without any errors. I haven't tested this with later releases of CDex, but I suspect it has something to do with the operating system and not the application. Anyone?

Can you locate the difference within the files ?

Did you try to rip with another ripper (like EAC) ?

Using EAC, you won't need binary comparison anymore because EAC has a built-in wav comparison ...

Gday..

probably a longshot.. but ASPI/SPT1 comes to mind..
not 100% sure these can alter the filesize.. but
my attempts show spt1 to be faster.

am using latest isobuster to extract the pcm data..
and just for funn... i tried to change between ASPI and SPT1.
(2k4) haven`t done any wav comparison though.

If you rip twice under Win2k, do you get identical files?

If your drive caches audio data (lots do), paranoia mode is of no use, therfore if your disk is scratched, even if you rip several times on the same OS, you will probably get different files!!!!

If your drive doesn't cache and you have paranoia mode on, then i don't know im afraid!!

KRistian

I get the same file each time (no differences, no errors) with repeated rips under Windows 2000, and the same file (no differences, no errors) with repeated rips under Windows 98SE. It's only when comparing the ripped .wav files from the 2000 and 98SE boxes that differences are apparent.

Both PCs have the same CDex version and settings. The CD-ROM drives are different in the two PCs - might that be a cause?

EAC reports extra samples when comparing the two .wav files from 98SE and 2000. I haven't tried ripping with EAC yet. I'll give that a go next.

Maybe you should try ripping with EAC using Test & Copy, it does CRC checking.
I don't know if this is the same, but I'm quite sure.

I am pretty sure it is just the different sample offset of the two cd-rom drives.
Quite normal.

You can check it: EAC wav comparison should report exactly the same number of extra (or missing?) samples on every track.

Edit: Read about offsets here.
Edit2: Usually you don't have to worry about the offsets, as it is really not so important.

By Xenu:


You should've said that right away. Of course files aren't bit identical, but only due to drive offset difference. Nothing to worry about, like kdo says. Try using EAC if you don't like it...

You can adjust track offset in the main window of cdex. There are also some options to set in options - settings - cd drive, like cdrom drive type, start offset, end offset.

But can CDex set the offset with an accuracy of one sample (I can't check I don't have it) ? Many programs can only set the offset with an accuracy of one sector (588 samples).

I am experiencing exactly the same issue with EAC under Windows 2000 and Windows XP. I have exactly the same configuration in both systems, and when I use Test & Rip under Windows XP, the CRCs will match - when I switch over to Windows 2000 and use Rip, the CRCs won't match anymore.
I am using LITE-ON LTR-52246S with the following ripping opptions (in both systems)

Accurate Stream = Yes
Audio Cache = Yes
C2 = No
Read Offset = +6

Any ideas?

In cd drive settings you can set with accuracy of one sector, for main window I don't know, I guess also just for one whole sector.

"Compare wavs", and if it's not enough, adjust them to the same offset in CoolEdit and substract them. This will show you what's wrong.