Re: CD & DVD restoration

Oksana Dykyj (oksana@vax2.concordia.ca)
Tue, 7 Aug 2001 13:16:03 -0700 (PDT)

You can clean and rejuvenate DVDs and CDs by hand. Scratches and chips are
pretty visible. However, I cannot say anything about this machine because I
have not seen it.

As to longevity, allow me to post a response that Eddy Zwaneveld whose in
Technological Research and Development at the NFB here in Montreal gave on
the AMIA list some time ago.

Roughly speaking, how long are laminates in DVDs expected to last? What I'm
really asking, i guess, is how long before they start to come apart.

Response:
While investigating the longevity of adhesives used for disc bonding, I have
been informed by the technical specialists of adhesive manufacturers, that
none of the adhesive products used for discs are tested for a life
expectancy beyond ONE YEAR, and thus there is no warranty beyond that time
frame. Improvements in adhesives are implemented all the time, which implies
that previous "perfectly satisfactory" adhesives are being declared
superceded after new products come online. There is to the best of the
knowledge of these experts, no accelerated test result that has been done or
published by the major adhesive manufacturers for disc products or for the
adhesion of polycarbonate to the materials or metals of which the sandwich
is composed. Therefore, in the absence of disc vendor's published
accelerated adhesion test results I would suggest that it is anybody's
guess, but one year you've got for sure. According to the disc
manufacturers, the discs should be stored at human comfort zone conditions
for maximum longevity. My test laser disc (or what is left of it)
delaminated after 10 years of storage in office conditions. So if you live
in a warm summer climate, you may leave a disc inside your car during a
sunny day, chances are that you can peel the halves apart or slide the
halves around with your eyes closed. Failing that, ask your children to test
them for strength. Please let us know if you succeeded, but don't send me
the bill!

Ed H. Zwaneveld,Technological Research and Development

At 12:46 PM 8/7/01 -0700, you wrote:
>I recently attended ALA in San Francisco where I saw a demonstration of
>the RTI
>DiskChek unit which checks, cleans and rejuvenates DVD's and CD's. (Now if it
>could only brew my morning coffee, I'd be sold!) Seriously, my question is
>this - has anyone purchased this unit or do you know anyone who has? I
>find myself
>in the contingent that is inordinately fond of DVD's but seriously doubts
>whether we're going to get much bang for our buck - certainly not like we
>did with
>videos, some of which have circulated more than 500 times! I smell a
>conspiracy
>here. I know this listserve is not intended to discuss equipment although I
>think this is a topic which would interest most of us. If you'd prefer to
>answer me directly, please send email to GontarekM@netscape.net
>
>Mary Gontarek
>Owatonna Public Library
>Owatonna, MN

__________________________________________________________________________
Oksana Dykyj voice: 514-848-3443
Head, Visual Media Resources fax: 514-848-7622
Instructional & Information Technology Services
Concordia University
LB-805-1, 1455 de Maisonneuve Blvd. W,
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