Hi,

I've ripped the same CD to WAV with EAC using 2 different drives.

One is DVD LG GDR 8161Bthat does cache (So option ticked)

One is CDRW LG GCE 8240B that does not cache(So option not ticked-double checked definately doesn't cache)

the CD has 14 tracks>all apart from track 14 were the the same.Track 14 on DVDROM was 99.9% and on CDRW was 100%.

Is it anything to worry about or do drives differ?

Thanks,
Ian

You need to eanter each drives offset for bit identical rips.

How do you know that there are differences? Have you checked with EAC -> Tools -> Compare WAVs... ?

HI,
Both drives are correctly offset

CDRW +733

DVDROM +102

I've checked with EAC WAV Compare and It SAys On final track(I've just checked and this happens on most/all rips)

Different Samples 05.4953------05.4956

Ian

Most probably this difference is due to that one of the drives is able to read into lead out while the other is not.

This is not much to worry about. You are missing either 102 or 733 samples at the end of the last track of the CD. Divide that with 44100 and you will get the time that is missing. As this only happens at the end of a CD, which almost always is silent, this is not really a big issue...

However, it seems as if one of your drives are able to read into lead out. And if so you should of course use that drive to rip if you want 100% perfect rips...

Maybe no drive can overread. Thus one silences 102 samples and the other 733, which leaves 631 different samples between the files, that is 0.00024 minutes.

Hi Again,

Just ripped another CD to try.

The results on the WAV Compare were:

Different Samples 0:03:49.530 - 0:03:49.544 (Which is 0.00024 like you said)

I've just checked the set up of both drives:

CDRW Only reads Lead in(So Overread box left unticked) OFFSET +733

DVDROM NoneOverread(So Box also left unticked) OFFSET +102

I use the CDRW drive as it does not Cache audio for my rips.

So in conclusion ever rip will have 0.00024 different samples on the final track if I leave the drives both set up with the Overread Unticked.Is that correct?

Would you agree on my choice of drive to use.

Thanks for all your help.

Ian


[Maybe no drive can overread. Thus one silences 102 samples and the other 733, which leaves 631 different samples between the files, that is 0.00024 minutes. ]

Ah, Pio cracked it...

Yes, both drives should have overread unticked...
Yes, 631 samples <=> 0.00024 minutes will always differ between rips.


Depends on what is important for you.
The fact that the CDRW drive does not cache does not necessarily mean that the ripping quality is better. It may rip faster that the DVD-ROM drive, since it doesn't cache, but the DVD-ROM drive may also be faster, in spite of that it caches. You would have to test both drives if speed is your main objective.

As far as quality goes it is difficult to say which drive is better. If you use EAC and EAC tells you that no errors occured, you can be very sure that it really is so. You would have to test with some scratched or bad CD:s and see which drive produces the least errors (if any of them do).

The DVD-ROM silences less samples at the end, which of course is good, as it gets you closer to the perfect rip. But as stated earlier, since this happens at the end of the last track, which usually is already silent, this is of very minor importance.

Personally i would rip with the fastest drive in secure mode. When or if that one fails, I would try the other drive....

Can you hear any difference? If not, the whole thing does not matter. Audio CD's were not meant to be read bit perfect like data CD's.

The LG CDRW Rips start at about 6x increases on a 70min disc to about 15x

The LG DVD Rips start at about 5x and increase to about 12x

The LG CDRW also rips more tracks at 100%(Averages one at 99% per disc)Whereas the LG DVD rips average 2,maybe 3 - 99% tracks on a 70min disc.

For badly scratched discs(which are only a handful )The DVD is better.

But I think I'll stick with the CDRW as the main rippper.

Ian

In practice, no. With most CDs, the tracks should be identical (the last 631 samples of the CD being null). Only the CDs with some noise at the end of the last track will be different.