As the person who wrote the accepted answer to that question, I'm flattered to see it linked here. (I'm also a bit embarrassed at reading some of my older rambling-style writing, but nothing beats experience :)

While my forray into malicious floppy disks didn't end with physical damage, I did manage to make one similar to DBAN. If you booted the computer with the floppy inserted, all drives would be formatted instantly, without any user input.

Fortunately, even in highschool​ I realized they probably imaged the school machines anyways. Probably...