If you don't want to lose the content of a diskette, then it takes very
little (proximity to the ignition system of a car, graphics tablet,
flourescent ballast, clock motor, Earth's magnetic field, etc.)
If you are TRYING to erase a diskette, then almost nothing will do it
(surface grinder, speaker coil, the magnet that they lift cars with for
the crusher, etc.)
--
Grumpy Ol' Fred cisin(a)xenosoft.com