Posted by gerry on 10/01/06 16:40

Joe Bloe, are you on drugs? The plastic surface of a CD can be
damaged. The lands and pits on the aluminum substrate store the
digital information. Maybe you should learn to read, the article
mentions nothing about damage to the plastic exterior of a CD. You can
scratch the plastic, you can warp it by excessive heat or exposure to
sunlight, just like any other thermosetting plastic. The plastic
surface is pretty strong, it can handle the beam from a low power laser
pickup, but some solvents could damage the plastic covering, so the
reflection from the substrate is slightly distorted.

By the way, what exactly is a data pit? Is that like the La Brea tar
pit, where wandering excess data gets trapped? The purpose of your
posting seems to be to make you feel smug. The guy who made the
original posting already cleaned his CD. Don't let me stop you from
passing on the obvious - LPs have no protective covering, along with
the strange - "pits" are surface scratches.

JoeBloe wrote:
> On 29 Sep 2006 22:03:48 -0700, "gerry" <gerrytwo@hotmail.com> Gave us:
>
> >What are you talking about? Phonographs records have spiral grooves of
> >varying depths which affect the output of the magnetic pickup. CDs has
> >pits (and lands), which are the physical equivalents of zeros and ones.
> > See the article extract below.
> >
>
> Fuck the article. The grooves on a LP are EXPOSED. The pits on ALL
> optical disc mediums are SEALED inside the disc.
>
> I thought the "pits" you were referring to were any surface
> scratches that the disc may have had on it when the wax hit it.
>
> Since it appears that you were referring to the data pit, I'd have
> to say that you are a bit loony. The freezing idea is good, but no,
> there is no wax in the data pits.

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