[NautiNurse]

rub sand onto the surface of the drive, hopelessly scratching it to prevent recovery.

Sounds labor intensive--unless you would consider a belt or orbital sander, or maybe a sand blaster?

[Lancey Howard]

I have a geek friend who said to just dump a little mercury on your hard drive and that's that.
Of course, try not to get any on your skin.

[LurkedLongEnough]

Sounds labor intensive--unless you would consider a belt or orbital sander, or maybe a sand blaster?

:-0 LOL

There is another alternative. I would give the drive to Hitlery and ask it to memorize the contents. Of course, later it wouldn't be able to recall a single thing!