>>181537Use bitlocker, delete bitlocker key. Ideally you'd keep the bitlocker key on a really small flash drive, that you'd quickly burn to ash.
>>181603That would be a terrible idea, because the data is stored in the magnetic domain and you're working in the electrical domain. If you toast the controller, all an attacker needs to do is lift the (completely intact) platters out, and dump them in another drive. There's YouTube videos of people doing this at home with hand tools and sellotape.
>>181537>>181539>>181542>>181547>>181603>>181628All these methods leave massive chunks of platter with recoverable data on them.
