There's the 720kb 3.5" floppies too. I remember there was a shady outfit(s) that sold punchers you could use on these disks to trick the drive into thinking it

There's the 720kb 3.5" floppies too. I remember there was a shady outfit(s) that sold punchers you could use on these disks to trick the drive into thinking it was a 1.44mb disk. Of course, those 720kb disks were never intended to store 1.44mb of data, so while you could write that data to the disk, and maybe even read it immediately after, the odds that you could read it again awhile later were pretty low.