You do need a very strong magnet. I’ve put 3.5 floppies on top of a mag tape 
demagnitizer ( not technically called that, but you know what i mean) and it 
had no effect at all. I could still read them fine in my pc. I surmised that 
the magnetic field generated was not strong enough to get through the plastic 
disk shield. Gave up after that. 

Sent from my iPhone

> On May 6, 2024, at 03:28, Just Kant via cctalk <cctalk@classiccmp.org> wrote:
> 
> I have a vague recollection of someone telling me there was a trick to 
> demagnetizing high density disks. Perhaps wave a magnet in various ways, even 
> moving the magnet to and from the disk's surface. Then again maybe it's just 
> a chatgpt style hallucination. Wouldn't hurt to try though.

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