There was a secretary I had to support in the early IBM PC days constantly calling because her data disk (5.25" floppies) were getting corrupted. We'd dutifully come over, use Norton Disk Utilities and recover what data we could. One time we got down there and for the first time we saw where she kept the disk when not in the machine. She had a magnet holding it to the side of her filing cabinet.
We (gently) explained the nature of this error to her. No more problems.
LOL.....That reminds me of my problem. I had a magnetic screw driver in a box that I kept floppies in. GRRRRRR