I don't know whether Aaron is an undercover DEA agent but that "defrag destroys all evidence" is pretty much nonsense. Especially running defrag after format is completely pointless. You thought you're smart because you knew that's gonna be faster, right? After a format completely fill the disk with non-compressible data. That should really destroy all evidence unless you're public no. 1 in which case the billion to restore the data anyway might be justified. Yeah I know under Windows such a simple task is really difficult to accomplish. Just download a boot disk for Linux or any BSD and use dd to overwrite your disk (dd if=/dev/zero bs=64k of=/dev/path_to_raw_device). That's a one-liner and effective.

Nonetheless, you should really use disk encryption and get some Alzheimer. There's no safer way and I'm pretty sure real lolipedofins are smart enough for that.