Just for my curiosity and knowledge,
I read on a book that Disk Utility can erase a Volume/Partition by using different option of security.
Among these options there is one called: 3 Pass Erase, that writes two passes of random data followed by a single pass of known data to the disk.
According to Apple, this option meets US Department of Energy. What does the US Department of Energy have to do with secure erasing data? Do they control the security standard? I thought was the Department of Defense that control the standards.