[pure-silver] Re: Archival methods (was Re: Re: Film Still Wins ... Even Compared To Leica 18MPix)
- From: Snoopy <snoopy@xxxxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 02 Jun 2010 19:37:45 +0200
Indeed - I have about 800 CDs and of those three ave started to get
"bit-decay".
You can see the coating flaking off INSIDE the CD. I always kept them
away from sunlight etc.
I am aware of diefferent processes: that's why I thoght the "pressed"
ones wold last longer as they are not chemically recorded but the pits
are actual physical dimples.
But then there were also some pens marketed for "Cd marking" whose ink
ate through the top protective layer and destroyed the coatng within.
Bad news.
Thats why a lot of archives now record digital data as dots on
microfiche...and store the films in huge salt stocks under Nitrogen etc.
Love,
Snoopy
Tim Daneliuk wrote:
> On 6/2/2010 10:54 AM, Dana Myers wrote:
>> On 6/2/2010 1:48 AM, Snoopy wrote:
>>> Recently German TV showed a documentary about the Central Music Archives
>>> in Berlin which has problems with storing music CDs etc. They report a
>>> life span of about 5 years and copy everything all over the place to
>>> make sure they do not lose things.
>>>
>> As an aside:
>> That's hardly representative of the permanence of CDs. I was a fairly
>> early adopter
>> of music CD in 1985, I have over 100 CDs that are well over 20 years old
>> with no apparent deterioration. I do nothing special to store them.
>>
>> With that said, relying on the integrity of a single piece of media for
>> long-term retention is not a good idea - the ability to produce exact
>> duplicates with no loss of quality is critical to a long-term archival
>> strategy.
>>
>> Cheers,
>> Dana
>>
>
> I too have 20+ yo CDs that are just fine. However, and for the record,
> it should be noted that factory produced music CDs use a somewhat different
> process than the dye-based burn used on your PC. I'm not suggesting one
> is better than the other, merely that their archival behavior will be
> different
> in all probability.
>
>
--
"Ceterum censeo, digitalem esse delendam"
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