In misc.survivalism Halcitron wrote:

Harddrives are hermetically sealed. If needed they can be overhauled
(replace the circuit card) to make them work long enough to recover the
data.

This is incorrect; most hard drives have an air vent with an HEPA filter
(often a little felt disc) so the cover doesn't blow its gasket if you
take the computer to say Denver after it's built at sea level. Thus if a
drive is submerged water CAN enter the head-disc assembly, especially if
the drive was at its operating temperature when the machine room got
flooded.

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Reply-to: address IS Valid.