[extraduder_ire]

I don't think you want to get a floppy disk anywhere near an electron microscope if you care about the data on it.

[Bluecobra]

I thought I remember reading somewhere that it is possible to retrieve deleted data on really old MFM hard drives with a electron microscope, hence the need for secure wiping/multiple passes in those particular drives, but would be impossible on modern drives due to the density.