How to protect a floppy disk?
To write-protect (stop deletion, overwriting, or adding to) a 3
1/4" floppy disk, slide the tiny plastic tab at the back of the
disk (opposite the shutter), so that it is open.
To protect a disk from damage, keep it in a dry,
temperature-controlled environment free of dust and smoke. Avoid
any contact with strong magnetic field (sudh as on top of stereo
speakers).