What To Do If the Disaster Already Happened
The main rule is simple: if the data you are about to lose are really important to you, do not experiment with the damaged media for too long (or at all)! You may further damage it beyond recovering (for an updatable list of professional data recovery services go to www.usbyte.com).
Floppy diskettes are designed to be robust and to operate in an unfriendly environment filled with dirt, abrasive particles, moisture, and so on. But, still, the environment and the way we handle floppy disks may cause the damage.
If you cannot read from a new floppy disk, it just may need formatting! But, make sure there is no data on the floppy disk—formatting will definitely erase all the data forever! Nowadays ...