On Tue, 19 Jun 2007, Chuck Guzis wrote:
If you can locate one, try a videotape degausser.
Radio Shack used
to have a very handy unit that was very useful for degaussing
floppies.
Radio Shack used to have a "Bulk Tape Eraser".
Then they changed the color, and changed the label to say
"Bulk Disk Eraser", and raised the price