Secure Erase is the best by far for speed and thoroughness of wipe. You can access with a Linux LiveCD using hdparm. It is about 35 minutes per 100gb. Enhanced Secure Erase is even faster if your drive supports it. Enhanced Secure Erase usually is available in drives that have built in encryption, and will wipe a drive at 100gb/per second. While they're breaking your door down, you can initiate an Enhanced Secure Erase and be wiped before they put their hands on the computer. @ chronomatic It's nice to see a faster dd solution than shred and /urandom with openSSL. That's pretty impressive. dd with OpenSSL, according to your numbers posted, is about the same for speed as Secure Erase. 36 minutes per 100gb Does dd wipe bad sectors, reallocated sectors?