Oh no, not a screwdriver.. a drill. I was happily drilling my fireplace (as you do, you know) and didn't know about the fact that the rotation of the drill bit created uber-magnetic fields..
... thankfully my HDD was there to educate me on that.
Clem,
the HDD was under guaranty so it's OK, I now have a beautiful fireplace and am still happily leaving ever-after
DBAN is powerful stuff and has been used by US federal agencies, such as the Department of Energy's National Nuclear Security Administration (NNSA), to prepare machines for disposal.