X-Message-Number: 2656
Date: Sun, 20 Mar 94 08:34:22 EST
Newsgroups: sci.cryonics
Message-ID: <>
Subject: Videotape Longevity

I7>    ------------ CryoNet Message Auto-Forwarded by -------------
I7>    ----------- Kevin Q. Brown <> -----------

I7>> Date: 18 Mar 94 22:14:13 EST
I7>> From: Mike Darwin <>
I7>> Message-Subject: SCI.CRYONICS Videotape Longevity

I7>Tim Freeman writes that videotape looses its "readability" within a
I7>decade or less.  This is not so.  It takes longer but it does happen.  It
I7>happens primarily because the magnetic material is bound to or "glued" to
I7>the terpthlate substrate with a urethane adhesive.  In fact in some tapes
I7>there may be five or six layers of material attached to the substrate.
I7>The substrate is more or less indefinitely stable, its the other part of
I7>the tape that aren't.


I7>Mike Darwin

You might also want to store a PLAYER.  A friend has had a very
difficult time trying to read NASA data tapes from the early lunar
exploration days, it seems there aren't any working tape machines left
that can read them!  The last I heard, he was trying to get someone to
custom build a machine to read them.  This appears to be a big problem
with any achival storage of data, I have some data tapes I made 20 years
ago that I can't read now (how many of us have 9-track tape drives?).
Also, when HDTV comes in around 2000, regular TV broadcasts will be
dropped, obsoleting ALL current TV recorders and sets.

Just someting to think about.

Jerry Durand

Jerry Durand              |   tel: +1 408 356-3886   | Standing on the edge
Durand Interstellar, Inc. |   fax: +1 408 356-4659   | of reality.
Los Gatos, California     |  |

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