[comp.sys.ibm.pc] Are magnets harmful?

kurtk@tekcae.CAX.TEK.COM (Kurt Krueger) (03/09/89)

I've seen more than one reference from people who have erased floppy disks by
rubbing a permanent magnet across them.  If you do this with an audio tape, it
is a very good way to get your tape player's head magnetized.  The result is
that your tape player will slowly erase the tapes as they are played.

Is this a problem with computer floppies?  Or is the design of floppy disk
heads and media such that this is a non issue?