Anecdotal data-point: a few years ago I rescued the data off my 3.5" floppies from the early 90's (IBM PC and Atari ST formats) and they all seemed to be fine.

Anecdotal data-point: a few years ago I rescued the data off my 3.5" floppies from the early 90's (IBM PC and Atari ST formats) and they all seemed to be fine. I don't have any hardware to read my pile to 5.25 Atari 800 disks.