[jethro_tell]

This is mostly me but the case that's the most common is that a disk can't be wiped because its dead. Gotta do that before hand.

[aftbit]

Well you can always drill holes in the platter, or hit them with a strong magnet, or just separate them and toss them in the trash. Unless you're fighting the NSA, you can probably get away with enough physical destruction to make recovery challenging.

[jethro_tell]

That doesn't work if you need to RMA the disk. So best to encrypt before you put anything on the disk