[filmscanners] Re: Archiving scans - DVD vs CD

["Arthur Entlich" <artistic-1@shaw.ca>]

Mike Brown wrote:


 > He was very honest in making clear that this was a projected value
based on
 > extended temperature, pressure & humidity storage.


What else could he say??? "well. we were actually finalizing this
technology back in the year 1899, and we've been secretly testing the
disks since then, and they were just fine until a couple of years ago,
when the data started to become damaged and error prone" ???

Any longevity claims of any length are based upon accelerated aging
methods, which, as "good" as they may be (its all we have) may be very
far off in either direction.

"Based upon our testing using 400 degree F conditions, to simulate heat
damage over many years, we have determined these disks will melt after
75 years" That's the problem with these tests, the only real method to
test for age related changes is be letting things age.  Any other method
makes a lot of assumptions.

Art


Mike Brown wrote:
> I was lucky enough to attended IFA, the Berlin consumer electronics
> exhibition, last week & managed to speak to a guy at Verbatim about their
> disks and longevity. (They're claiming 100 years on their write-once discs.)
> He was very honest in making clear that this was a projected value based on
> extended temperature, pressure & humidity storage. He mentioned that
> humidity is a particular problem - time to buy sealable storage units &
> silica gel maybe (or is silica gel a contaminant???)
>
> Verbatim claim that their "Super AZO" dye makes a big difference (I notice
> that some Verbatim CD-R disks in a local store were "Azo" and others "Super
> Azo"). He went on to say that DVDs are better than CDs because both top and
> bottom surfaces are coated with plastic - reducing the risks from humidity
> and atmospheric contaminants.
>
> Interesting conversation but I'd like to see some lab results!
>
>
> Mike
>
> 
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>

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