This project was inspired by Aftotech’s Hard Drive Speakers page 4 . Basically the voice coil drive circuit was located on the hard drive controller board and disconnected by cutting a trace. The voice coil was metered and was found to be 10 ohms, this was within range to be driven directly from my stereo speaker output.

This is bad ass... What a great (but useless) idea... time to get the VOM and some torx bits out...

Hard Drive Laser Oscilloscope