D'oh! Only just noticed the "only" in the "I only have computers..." option. Well, I do have some computers with no space for a floppy drive, just as I have some with spaces and some with drives.

I also have a piano with a floppy drive, which is why I occasionally use diskettes for data storage. Very, very rarely I'll use one for work, but thankfully USB flash drives are a lot more accepted in customer environments now than they were five years ago.