Discussion in 'Sky Digital TV Forum' started by General Skanky, Jun 10, 2005.
Can the magnets of an unshielded speaker bugger up a sky+ hdd?
It's unlikely unless it's very close (within 6") of the speaker.
It would also have to be a bloody big speaker played at full power!
Even if a bare hard disk was sitting on top of the speaker it's unlikely to be affected. It's only unshielded media, like old floppy disks or VHS tapes which would be affected by speakers. If you've ever seen a "bare" hard disk drive unit you'll know that it comes in a solid aluminium box and is therefore shielded.
Sorry, but I have to correct you there. The magnetic field around a speaker is mainly due to the large magnet which surrounds the voice coil, and therefore the magnetic field hasn't got very much to do with the power being fed to it. The magnetic field will still be there at full strength even when the speaker is silent.
Also, aluminium is a very poor shield to magnetism. It's used for its light weight, and easy machining properties, not for its ability to act as a magnetic shield. The thin steel case on the Sky box will shield more magnetism than the drive case ever will.
Like all other forms of electro-magnetic radiation, the energy radiated in the magnetic field will have the "inverse square" law applied to it, which basically means that the field strength drops with the square of the distance. An average speaker magnet will probably have no effect on a hard drive at distances much above 6", but it's still advisable to keep the drive as far away as possible from the speaker.
P.S. Most CRT TV's emit far more magnetism when they degauss themselves at switch-on than a speaker ever will
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