Unlike hard disks, where the read/write head floats above the surface
on a cushion of rapidly-moving air, here the head actually touches
the surface. Consequently, both the head and the media wear out quickly.
HD (High Density) 3.5’’ floppy disk:
There is also a low-density (LD) version, with half the capacity,
as well as old 5.25 - really “floppy” - disks