You are not only very rude and unfriendly, but like most rude "know-it-all" people you are also completely wrong.
Its actually very easy to unformat a floppy, done it many times, you just need a very strong magnet and to "wipe over" with the magnet over both sides of the floppy several times..
Make sure you make at least 4 passes. 2 per side and on each side make 1 pass at 90Â° to the other.
Some floppies need two treatments to work.
Format the floppy first under windows (full format not quick) to make sure that the surface is in a good condition before even starting.
I used this method years ago, it works perfectly as you only need to wipe the old format....
I used a strong magnet for holding memos onto a metal wall.....stronger is better.....get a better magnet if it does not work for you......