Thermite is the best option. Unless you want to use DBAN. But you did say physical.
Believe me, the FBI can recover from smashed hard drives.
ebay sells the components for thermite. But with the plane scare crap I bet ebay forbids the selling of it. Thing is all TSA needs to do is forbid lighters and matches on planes. Is that not banned already?
There are other ways though...
Would actually be quite easy to take out anything with thermite. It's so easy to make compared to other comparable destructive forces. You could pretty much make a thermite "bomb", send it to a predefined location using a drone and have it activate. For example you could send it on the roof of the NSA headquarters, if you happen to know where very critical building infrastructure or important people are, you send it there.
All this anti terrorism bullcrap wont stop people who are determined.
The most destructive yet commonly available tool might be a cutting torch. Failing that, a severe beating with an 8 pound sledge might make data recovery pretty difficult.
Thermite doesn't blow up.
This thread is being tracked by the gubberment.
Hell, this thread is being read by ISIS now.
A torch is the method that I would use because I know a couple of people with the equipment. I could hand a guy $5 or $10 and say 'melt this please'.The most destructive yet commonly available tool might be a cutting torch. Failing that, a severe beating with an 8 pound sledge might make data recovery pretty difficult.
Keep talking.
I have a pile from work rigs that I pulled and nuked. Now I have no idea what to do with them.
