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I use a bench vice and a drill.

I figure that a magnetic HDD with its PCB destroyed containing all the adaptives, and the platters with several 10mm holes in them and all the swarf inside is probably good enough.

If not, good luck to them.

I'd never sell an old hard drive.

Mind you, I've had to /buy/ old hard drives with SCA SCSI ports or old SE SCSI disks to get some life into an old Unix server or two before deciding that the personal power station I need to run these ridiculously power inefficient servers was too much, then they get drilled and recyled into the metals recovery.