I have over a hundred 28 year old cd's of music that still play fine and
sound great. I play them on a PS3. They have always sat on a shelf
upright for all that time except when I've moved. I also have cassette
tapes that I recorded while I was in college that still play and also
sound great. As a result I think the life span that manufacturers claim
is way too conservative, even for disks and tapes that have had no
special handling. 

But that's just my opinion based on my limited experience.

Bill Creamer
Records & Conflicts Manager
NY,NY 10019

-----Original Message-----
From: Records Management Program [mailto:[log in to unmask]] On
Behalf Of Frederic Grevin
Sent: Wednesday, January 11, 2012 11:17 AM
To: [log in to unmask]
Subject: Re: [RM] Renewals on inventories?

Gordy Hoke said "If a record for a 30-year lease was stored on a CD, the
renewal field's date would be within the life expectancy of the CD"

With all due respect, Gordy, I think it would be EXTREMELY FOOLISH to
expect a 30-year life expectancy for any CD.

Reasons:
- Manufacturing characteristics of the "CD" (CD-ROM vs. CD-/+R vs.
CD-/+RW).
- Encoding of CD (CD-ROM vs. CD-R vs. CD+R vs. CD-RW vs. CD+RW).
- Environmental conditions under which the "CD" (whatever type and
encoding) has been stored.
- Availability of appropriate "CD drive", both hardware and software. My
staff recently retrieved from off-site (non climate-controlled) storage
a box containing 8" floppy disks. Best guess is Vydec or Wang ...
- Availability of appropriate operating system and platform. "Signals"
(a US Library of Congress publication on digital preservation) recently
featured an article on the practical impossibility of retrieving info
from a "CD" from the early 1990s.

Fred


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