The US Military still use 8-inch floppies.

In place of a hobby (limited time per application) use degausser from Radio Shack (are they still around?), I used to used a discarded coil from a large loudspeaker (the coil is a bit larger than my fist) to degauss TK50 tapes so that they could be re-initialized as a TK70. That was quite successful. Since it was almost a contact situation, almost the total field strength from the coil would have been applied. I usually moved the coil from side to side over the surface of the TK50 to produce the desired result. Since the EMP field from a nuclear device would rarely be closer than a hundred miles, even though the original field strength would be millions of times greater than the coil I was using, perhaps the field strength on the TK50 was as large or larger as an EMP pulse. Does anyone have any specs on what the direct application of a coil produces vs an EMP pulse at a distance? At one point, I think I did use the coil to erase an 8" RX02 floppy, but I can't remember any longer if that was ever actually done. Since I would have used a DSD 880/30 to re-format the 8" floppy after that, there really was no need to degauss the 8" media first. Jerome Fine