Wow, that's crazy. I wonder how that worked, putting about 20x more data on an HD floppy than it was designed to hold? I thought the capacity had something to do with the minimum size of the magnetic domains on the floppy media - basically if you tried to make the bits on the disk too small, the sections that were magnetized one way would blur into their neighbors magnetized the other way or something - with the limit determined by the properties of the media, not the drive itself.