I have ~10 HDDs that I’d like to dispose of. For a while, I tended to buy unwarrantied used disks for my NAS, so these have all failed in some form or another over the years. I can’t just toss them, because they have my (unencrypted) data on them, but I can’t wipe them either since they don’t mount anymore. I want a simple and reliable way to render the contents unrecoverable. A nation state is not part of my threat model, but any kind of data reconstruction that could be bought with civilian money is.
I’ve tried:
- Smashing with tools (largely ineffective)
- Punching holes with a drill press (how many holes are needed to ruin the disk? Also I’ve broken/dulled a few bits doing this)
Back in the 70’s my dad worked for controll data - I think when Cray still worked for them. One day uniforned military came to the lab he was in with a failed haredrived handcuffed to them (i’m guessing this would have been a 14 inch drive?). They watched while the lab opened the drive to find physically warped platters, then used rags to wipe the oxide off, took the rags tothe parking lot and burned them.
not sure how practical that is for you but it was once the standard to be sure.