I get some on my old, scratched CD's and some CD-R's. I figure the noise is what happens when the laser can't read 98% or better of the CD surface. (By the way, Plexus works miracles not only for our back windows, but also for scratched CD's and DVD movies)
It could also be a sign that your laser is tracking a little bit out of spec--I would assume this if the noise occurs consistently with new CD's.
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