You might want to start with Jim Lidner's report that he recently
completed  for the Dance Heritage Coalition
(see: ).

Lance Watsky
Preservation & Media Specialist
Georgia Archives

-----Original Message-----
From: Association for Recorded Sound Discussion List
[mailto:[log in to unmask]] On Behalf Of RA Friedman
Sent: Friday, June 10, 2005 9:47 AM
To: [log in to unmask]
Subject: Re: [ARSCLIST] Longevity of data tape?--

Is there any information around about what is being done for long-term
preservation of digital video? Uncompressed video files are very large,
27mb for every second of video at 30 fps. A full length movie can easily
fill a small hard-drive.

Anonymous SET ARSCLIST DIGEST <[log in to unmask]> wrote: I appreciate the
numerous references to migrating data tapes every 5 years or so.
However, that should not be misinterpreted to mean simple physical
migration but should include a change of file format if warranted.

As for the physical make-up of data tape I'm not sure. I do know that
DV-CAM, R-DAT and other like miniature digital tape types are
manufactured using evaporated metal. This method yields the most
unstable tapes and should be used only for production and storage in the
3 - 5 year time frame only. I personally have seen tapes of both formats
generate huge error counts after only a couple years.

Kevin Irelan

RA Friedman, Archivist
Freedman Jewish Music Archive
University Of Pennsylvania

Webmaster, Yiddish-American Digital Archive
(Not affiliated with University of Pennsylvania)
Restored 78s in Real Audio

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