[78-L] "archival" CDs?

[davdieh at aol.com]

 I've heard that some fanatics keep the original analog recordings.
Can you imagine...?
David Diehl

-----Original Message-----


Why not have the digital data uploaded into chromosomes on some of those 


redundant genes in a small willing portion of the human population? Say, 
record collectors?
Mal

*******

Antony Pepper wrote:
> Good practical advice.
>
> Personally, I would recommend laser etching all *really important*
> archived digits into granite slabs as 2D (matrix) barcodes... This
> will enable the information to be recovered quite easily by equipment
> yet to be designed, for probably many thousands - maybe millions - of
> years to come.
>
> Do make at least two sets, stored in different locations, each
> containing at least 100% parity/redundancy info (that way the data can
> be recovered from just half the total number of slabs in each set -
> any half).
>
> If that's not possible for you, you could try inkjeting the same
> barcodes onto rag paper. Those sheets or rolls will be okay for least
> 100 years in good storage, probably a lot longer, and can be scanned
> back in by whatever optical device is then available without any great
> difficulty. You'll need a lot of paper though.
>
> Do include a human-readable definition of the data format!
>
> If you want ongoing access to the data, not just to store it,
> practically speaking you need a copy on a live array of come sort.
>
> Best,
> A
>
>
>   
>> Hi Rodger,
>>
>> As others have already pointed out, perhaps the greater risk is
>> obsolescence of the CD format rather than deterioration of the
>> media.
>>
>> Once you are in the digital world, you need to commit to data
>> migration in order to keep your digital audio in a current
>> format.  Figure on a major migration every 10 years.  Fortunately
>> the migration process can usually be automated if the files are
>> on a server.  At some point you'll have to ingest all those
>> gold CD-Rs - long before their supposed 300-year lifespan.
>>
>> Mitsui/MAM-A markets their discs very well.  The fact of the
>> matter is that the dye layer (pthalocyanine) is still organic.
>> And organic materials have a finite life.  Unlike shellacs and
>> LPs, you can't put CDs on a shelf for a few centuries and expect
>> them to be usable - even the gold CDs.
>>
>> So store your discs dark, cool, and dry if you want maximum
>> life.  You will still need to check the data on the CDs every
>> few years to make sure there's no corruption.
>>
>> Assuming that you are saving WAVE data files, I strongly
>> recommend generating MD5 checksum files (a type of digital
>> signature) for each digital file.  This will allow you to test
>> the files for data corruption.
>>
>> See
>>
>> http://www.theaudioarchive.com/TAA_Resources_FTP.htm#Checksum_Tutorial
>>
>> to learn more about checksums.
>>
>> If your university has an IT department, you may want to speak
>> with them about their resources for long-term archiving of data
>> if you have a large number of digital audio files.
>>
>> Hope this helps!
>>
>> Eric
>>
>>
>> -----Original Message-----
>> From: 78-l-bounces at klickitat.78online.com
>> [mailto:78-l-bounces at klickitat.78online.com]On Behalf Of Rodger Holtin
>> Sent: Thursday, January 29, 2009 1:38 PM
>> To: 78-List
>> Subject: [78-L] "archival" CDs?
>>
>>
>> I've recently transferred some reels to digital for the university where I
>> work and the archivist says she wants them on GOLD CDs as they are "archival
>> quality."
>>  
>> Since they don't carry those at CheapIsUs Office Supply or Radio Shark, this
>> is new to me.
>>  
>> True?
>>
>> Rodger
>>
>> For Best Results use Victor Needles.
>>
>> .
>>
>>
>>
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>
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