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Possibly of interest - DVD-R longevity:
On Mar 24, 2006, at 5:10 AM, Parker Dinkins wrote:

> Of the approximately 600 pieces of optical media that were below the 
> water
> line in our building during the Katrina flood, only 4 were DVD-R 
> media. None
> of those pieces survived.
>
> On the other hand, most of the other manufactured DVDs and CDs and 
> gold CDRs
> did survive. The exceptions were mostly manufactured DVDs and CDs 
> whose top
> layer dissolved or came off, allowing water penetration. In some 
> cases, the
> reflective layer of some manufactured audio CDs have pit holes, where 
> the
> reflective layer was dissolved, but still are playable.
>
> Furthermore, there seemed to be more failures in multi-disc music
> collections than single releases.
>
> This is not a scientific study by any means, but I would not want DVD-R
> media for unmanaged long term storage.
>
> ---
> Parker Dinkins
> MasterDigital Corporation
> CD Mastering + Audio Restoration
> http://masterdigital.com
>
>
> on 3/24/06 6:16 AM US/Central, Steven Smolian at [log in to unmask] 
> wrote:
>
>> This report suggests the use of DVDs, recorded at 24/96, be 
>> considered as a
>> standard on which preservation work would be stored.
>>
>> We know from last year's (?) NIST report on optical media longevity 
>> that the
>> only medium truly capable of long-term, reliable storage is a CD with 
>> a gold
>> reflective layer.  Unless it slipped past my radar, there is no such
>> recordable DVD at present.  Using a DVD for long-term stoage appears 
>> as much
>> of a gamble as using anything but gold for similarly intended CD 
>> storage.
>>
>> It follows that archivally-intended projects for which the final 
>> storage
>> medium is the DVD should also be preserved at 44.1/16 on gold CDs 
>> until there
>> is a gold DVD on the market.