Yes, the dyes fade too but it's the aluminum that provides the
reflective surface for the laser beam.
Chuck Norcutt
Winsor Crosby wrote:
> I don't think anyone loses data because of oxidized aluminum. It is
> the dyes that contain the bits that fade in two years. Admittedly
> some dyes are more permanent than others.
>
>
>
> Winsor
> Long Beach, California, USA
>
>
>
>
> On Jan 3, 2007, at 10:30 AM, Chuck Norcutt wrote:
>
>> Sounds like you missed the discussion of CD longevity (or lack
>> thereof)
>> from a few weeks back. If you're going to use CD's or DVD's you must
>> use the gold ones. Normal CD's and DVD's have a thin layer of
>> aluminum
>> sputtered on the plastic which is then covered with a thin layer of
>> lacquer. Ultimately, water vapor and oxygen find their way through
>> and
>> around the edges of the lacquer and oxidize the aluminum... thus also
>> oxidizing your image bits.
>>
>> The gold stuff won't oxidize but you'll pay much more for them.
>> But if
>> accelerated aging tests are to be believed 50-100 years life should be
>> expected.
>>
>> <http://www.encoredataproducts.com/Gold-Archival-Gold-Media-p-1-
>> c-344.html>
>>
>> You can get a 5% discount here by using a discount code "TOP5" when
>> checking out your order. I found that on Mike Johnston's site but
>> can't
>> seem to locate it again.
>>
>> While looking for that I also found this interesting link which
>> makes a
>> strong technical argument for the use of DVD+R media based on
>> significant improvements in error correction methods over other DVD
>> media types.
>> <http://adterrasperaspera.com/blog/2006/10/30/how-to-choose-cddvd-
>> archival-media/>
>>
>> Chuck Norcutt
>
>
>
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