All I'm saying is the DOD 3 pass wipe, while secure, is basically a waste of time when the single zero pass method takes 1/3 the time and renders anything on the drive unrecoverable. The only chance it may be recoverable is if the drive was broken apart in a clean room and the platters themselves scanned in whatever manner companies who do high level data recovery companies use. Even doing this, they are unlikely to recover anything, it would be extremely expensive, and extremely time consuming. Someone you're selling the hard drive to has no chance in recovering anything off of a drive that was erased using the single zero pass method. None. No amount of hacking by someone who you sell your drive to is going to get that data back. It's gone.