How can I reliably erase all information on a hard drive?
I'm looking to see if there's a method that can completely wipe out the content of a HDD, so that nothing previously on it can be recovered by any means, even by a professional. I'd like the HDD to be useable afterward by someone else.
I've come across HDDGuru, File Shredder, and DBAN.. As I understand them, they write on the HDD over and over to make recovery difficult at the minimum. How effective are these? DBAN seems the most promising..