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I thought hard disk speakers looked cool so I've made one.
The hdd which I've used is an old Seagate (631mb capacity – yeah.. Really old.)
Don't do this with new/good hdd's because once you open that drive's case, you can't expect to use it as a storage drive anymore.
“hard disk speakers” are nothing more than eye candy. they sound pretty crap and you need an amplifier to work it. they're quite easy to make though.. – if you have a dead hdd lying around, might as well play around with it =D