Re: scratched CDs


"Dave" <davenpat@xxxxxxxxxxxxxxx> wrote in message
news:wfKdnbjuS8C2Li_YRVnytwA@xxxxxxxxx
Cheemag wrote:
On Sat, 20 Jan 2007 17:05:17 +0000, Dave <davenpat@xxxxxxxxxxxxxxx>
wrote:


Cheemag wrote:

On Fri, 19 Jan 2007 19:18:55 -0000, "IT" <anyone@xxxxxxxxxx> wrote:



"Trev" wrote;


Scratch on the top lets the laser pass though with out reading data.
One on the bottom meaningless unless it is very deep

Ah, that makes sense, thanks for clarifying that. So from which side
should scratches be polished out, the top, bottom or both? Just curious
as I don't let mine get scratched.


How do you avoid that? Much-used discs tend to collect scratches
from constant insertion into and withdrawal from the tray of the
drive. With the best will in the world, you'll scratch them!


Not long ago, I had a 52 speed CD rewriter that was prone to exploding a
CD into many fragments. After that, the first thing I do now is make a
back-up copy from the original and use that. I then put my master copy
away. It doesn't matter how much the back-up gets scratched as the
original is still available to be copied again.


I do something like that in a sort of half-hearted way, save the most
important data to DVD+RW or DVD-RAM (on the fly) and also backup to
CD-R/DVD+R.

Problem is optical RW is so damned unreliable.

Yes, I was forgetting, some data has to be backed up on re-writable CDs.
If you write to CDR then the attributes get set to read only :-(

Didn't there used to be a self-adhesive protector you could apply
to the data side of a CD to prevent scratches? Can't find anything
about it nowadays.

In the dim and distant past (probably more than ten years ago), I remember
a film that could be applied to prevent the scratches being a problem.
This was not a product that claimed to prevent scratches though.
I would assume that the film and the adhesive acted as an optical
correction for the laser light.

Anyone else remember this and did it work?

Dave

The problem with self adhesive film or labels is in time they shrink and put
stress on the disc. This it what makes them shatter


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