Mike Burger <[EMAIL PROTECTED]> wrote:
>Where I "got that one from" was experience...I burned a couple of
>audio CDs (copying an audio CD in my CD-ROM drive to a CD-R in my
>burner) at 2x (maximum speed of my burner), and my Pioneer 6-disc
>changer in the next room could not play the CD. Any CD-ROM in the
>house could (and I have a number of systems to choose from in that
>regard), but no CD player.
>
>When I burned new copies of the same CDs at 1x, they worked fine in
>any CD *player* I own, as well as the various CD-ROM drives.
That's simply because data drives have a higher tolerance for errors than
audio drives. The speed you burn at is irrelevant -- if it were possible,
you could burn at 100x and as long as the errors were minimal it would
play on an audio CD player just fine. The above scenario means that your
burner had too many errors at 2x but far fewer at 1x.
CD's pressed by the standard CD manufacturing process are just that --
pressed. They have physical pits on the surface of the disk that create
lighter or darker segments that reflect the laser pickup differently. On
"burned" CDs, there are none of these surface variations. The burner
simply... uh... "burns" the media so that it appears to be darker or
lighter. This provides similar reflective properties, but it isn't as
effective as pressed media.
One reason audio players are so bad at error-correction is that they were
all designed for production-grade audio CDs. Audio players' error
tolerance is designed with the "normal" error rate of "pressed" CD
assumed. When you put in a burned CD, which has far more errors, the
audio player often has trouble. This is also a good way to test the
error-correction of your various audio players ;) I suspect that this
will be less of a problem in future audio players -- now that CD burners
are more common, my guess is that audio player manufacturers are going to
be improving the level of error correction on their players.
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