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Date:	Sun, 15 Aug 2004 14:21:57 PDT7
From:	Peter Skye <pskye@peterskye.com >
Reply-To:	scoug-help@scoug.com
To:	scoug-help@scoug.com
Subject:	SCOUG-Help: CD Longevity

Content Type: text/plain

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Steven Levine wrote:
>
> Speaking of mag tape, organizations with a large investment in archived
> data on almost any format will have employess whose sole job it is to
> verify that the integrity of the backup medium. This mean that it is
> someone job to haul out the backup, on some schedule, and verify it can
> still be read.

Yes, good info, thanks. And iirc they have a schedule to make copies of
the backups so there's always a "fresh" one which, theoretically (your
milage may vary), is brand new so it will last longer than the
original.

Mag tape and disk have a hysteresis decay problem; IBM had an entire
research department dedicated to learning what the decay curve was (they
found some kind of limit to magnetic storage before decay became too
unwieldly, I think it was 100 molecules per bit).

As for CD decay, perhaps Foxey can research that one?

- Peter

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