School is where I got to use the PET as well. At first, you could only use the cassette drive. Then the school got a 5 1/2" floppy drive. The speed was fantastic. I could save, search, load work and programs in under 20 seconds!
I did read somewhere that a kid saw an actual 3.5 disk and thought it was a 3D print of a save symbol.It's unlikely we'll forget the floppy disk, as it'll probably be used as the "save" icon for the rest of time, and every so often a curious child will ask "what is that?"