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At 08:43 AM 10/11/2005, [log in to unmask] wrote:
> I have a question for the list. When a CD or DVD begins to stall or
>skip, is there any way to repair it?
>
>Thank you
>Tammy Godwin
Greetings!
I have found the DVD FAQ useful in the past, and so it is again.
It's located at:
http://www.dvddemystified.com/dvdfaq.html
Relevant section:
Cleaning and repairing DVDs
If you notice problems when playing a disc, you may be able to correct them
with a simple cleaning.
* Do not use strong cleaners, abrasives, solvents, or acids.
* With a soft, lint-free cloth, wipe gently in only a radial direction
(a straight line between the hub and the rim). Since the data is arranged
circularly on the disc, the micro scratches you create when cleaning the
disc (or the nasty gouge you make with the dirt you didn't see on your
cleaning cloth) will cross more error correction blocks and be less likely
to cause unrecoverable errors.
* Don't use canned or compressed air, which can be very cold and may
thermally stress the disc.
* For stubborn dirt or gummy adhesive, use water, water with mild
soap, or isopropyl alcohol. As a last resort, try peanut oil. Let it sit
for about a minute before wiping it off.
* There are commercial products that clean discs and provide some
protection from dust, fingerprints, and scratches. CD cleaning products
work as well as DVD cleaning products.
If you continue to have problems after cleaning the disc, you may need to
attempt to repair one or more scratches. Sometimes even hairline scratches
can cause errors if they just happen to cover an entire error correction
(ECC) block. Examine the disc to find scratches, keeping in mind that the
laser reads from the bottom. There are essentially two methods of repairing
scratches: 1) fill or coat the scratch with an optical material; 2) polish
down the scratch. There are many commercial products that do one or both of
these, or you may wish to do it yourself with polishing compounds or
toothpaste. The trick is to polish out the scratch without causing new
ones. A mess of small polishing scratches may cause more damage than a big
scratch. As with cleaning, polish only in the radial direction.
Libraries, rental shops, and other venues that need to clean a lot of discs
may wish to invest in a commercial polishing machine that can restore a
disc to pristine condition after an amazing amount of abuse. Keep in mind
that the data layer on a DVD is only half as deep as on a CD, so a DVD can
only be repolished about half as many times.
Also, they have some links to the NIST guides for CDs and DVDs:
http://www.itl.nist.gov/div895/carefordisc/onepage.pdf (one page guide)
http://www.itl.nist.gov/div895/carefordisc/CDandDVDCareandHandlingGuide.pdf
(50 page guide)
Finally, there's ISO Buster, a CD / DVD recovery tool.
http://www.isobuster.com/
--
Michael Edwards
List archives at http://lists.ufl.edu/archives/recmgmt-l.html
Contact [log in to unmask] for assistance
List archives at http://lists.ufl.edu/archives/recmgmt-l.html
Contact [log in to unmask] for assistance
List archives at http://lists.ufl.edu/archives/recmgmt-l.html
Contact [log in to unmask] for assistance
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