After giving this one some thought, I've finally figured out what has become truly useless (at least in my world) of vintage computing.... Double sided high density 5 1/4" floppies. I have absolutely no use for them. If the computer is new enough to have 1.2M floppies, why not use the 3.5" 1.4M floppies? Besides, if I REALLY wanted a 1.2M 5 1/4" floppy, I'd just format a double sided double density one. I have tons of those, and I need every single one of them since they work in my Commodore and Apple drives.