I have a floppy that erases floppies and it turns out that its leaky caps - in the floppy drive itself.

In the back of the drive next to the stepper motor are two caps - the dreaded 47µf @ 16V and the other is 10µf @ 16V. But they are pin hole throughs, not the surface mounts. They are the same caps but with leads.

All the other caps looks fine and the floppy drive is running fine again.