Fun fact, in some countries the 3.5" floppies were called "stiffy disks". You know, because the outer casing was "stiff" as opposed to the floppy 5.25" disks. This discovery led to a lot of chuckling among the team I worked with when we opened a new product from one of those countries and read the manual. The instruction to "insert stiffy disk" still leads most of us to chuckling today.