Joerg Schilling wrote:
What causes lower quality in this situation? Is it copying in DAO mode, or on-the-fly?Can I copy an audio - cd in dao-mode on-the fly with cdrecord like cdrdao d=
oes=20
Cdrecord does not support this by intention because this would usually lower quality.
I don't know how DAO mode would lower quality. It reads all of the audio data on the disk, then writes it to another disk with the same track layout. (I know there's a little more going on than that...) cdrdao supports paranoia. I expect data read from a CD with paranoia to be exactly what's on the CD, except when the CD is very badly damaged, in which case the application reports the bad data section. Except in the "very badly damaged case", because the written audio data is exactly the same as on the source CD, I can't see how DAO can cause lower quality.
on-the-fly mode is described by the man page for cdrdao as "Perform CD copy on the fly without creating an image file." I can't imagine how that would cause lower quality.
I do see cdrdao being beneficial if you want to keep the original CD's track pre-gap lengths and/or hidden tracks. The man page even has examples for creating your own CDs with non-standard track pre-gaps that have lengths other than 2 seconds and contain nonzero audio data.
I did some quick Google searches for cdda2wav and "hidden track". I didn't see anything there or in the man page for extracting hidden tracks, but I also have not tried to do it. According to the man page for cdrecord, changing the pre-gap length is only usable on TEAC drives. Is there an easy way to copy a whole disk and preserve the hidden tracks and pre-gap time with cdrecord and cdda2wav (or another extraction program)?
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