I once had a celeron 300 that sat on top of a 15 inch speaker and never once thought about the magnetic field it generated at 200 watts. Several times I brought it over to a friends house and everytime without fail, every byte of data would corrupt. So I would just reformat, install the games and swear he had a grimlin. It wasnt until i brought it over to another friends house that I realized when it was sitting on the speaker it adapted to the new field and when I moved it, the harddrive would just fall to pieces. So I just started bringing over my stereo with me and never had another problem...