peter at digitalbrains.com
Mon Jan 7 17:54:15 CET 2013
On 07/01/13 16:39, Mark H. Wood wrote:
> I'd suggest assuming some periodic read-only use, since we *should* be
> testing our backups regularly to discover decay *before* it makes
> something irretrievable.
I would assume the decay to make it irretrievable the moment you discover
it. Hoping the bit flips in a non-vital piece of (meta)data seems like a
risky backup strategy.
Flash memory stores its data as an electrical charge, which can leak away.
It does so very slowly, but it still does. We are talking about years.
And reading a cell does not "refresh" it, so read-only use will in principle
not do anything to extend the storage time.
 Johan Wevers mentioned radioactive radiation. Sounds plausible to me,
that should be capable of knocking electrons away, I'd think as a layman.
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