I thought about how to scrap the hard drives last night.
Can you drill a hole into the side of the case thru the ali & into the side of the discs, that should also rip up the disc making it useless.
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A while ago I got a harddrive disc & scratched across it & put that into a container with HCL acid.
It ate all of the Ali inside the disc & left a suprisenly thick coating that the acid didn't affect.
I have used HCL acid to eat up chrome/nickel heater elements before so I don't expect the outer layer to contain chrome or nickel. I don't have the weight or thickness at the moment.
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