Re:Induced currents (Score 1)

I doubt such a fan would not induce enough currents in the PCB traces to cause data errors, but for audio equipment (at least in the broadcast industry where they seem to need 120dB SNR to enjoy german country music) it can be a nuisance. brushless motors work by rotating the magnetic field of the inner stator, and the permanent magnetic rotor then rotates to match fields. This is a lot worse for inducing currents than a normal motor where the permanent magnetic stator is on the outside, sitting still. The field variance seen on the outside of the brushless motor is way bigger...

Maybe you could _theoretically_ disrupt the reading if you managed to focus the magnetic field on the head, where the signal is still unamplified. Hmm, have to test that in the lab next week :-P