The head or the platter are the parts most likely to die on a HD, not the motors, so try powering some up and see what happens.
You could hook the power up to a transistor, and the HD indicator from your motherboard to the Base; so when your computer accesess your HD, all your HD's go crazy!
You'll probably want to install a switch too cos the novelty will wear off after about 10 seconds. Great for LAN partys, if you ever drag the case there
Meh...you guys calmed me down. I don't jump the gun so much with the "Get that Phone away from my computer! Don't you know there's a teeny-tiny MAGNET in that?!?! Dear god man/woman!"
-Dave