Wirko wrote:I just made a little test with a dismantled HDD. While there are strong magnets in the actuator, their magnetic field is strictly confined by the surrounding steel plates. Any part of these plates barely attracts a screwdriver from a small (say 5 mm) distance. That's undestandable - in the opposite case the HDD would erase half of its data in no time.
I have some experience with loudspeaker magnets, cassette tapes, and close distances. I'd keep any magnet, even a "plain" black ferrite one, at least a centimeter away from the HDD case. Three times as much for a rare earth magnet - if it were completely unshieded, but fortunately it never is.
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