Quote from: Fallkniven on May 16, 2013, 10:10 pmTruecrypt can be used to do a 3 pass overwrite with random data while it encrypts your entire system drive, be aware that this will likely take days or weeks using 3 pass method, depending on HDD size, Truecrypt also has the Guttman 35-pass overwrite method, which potentially could take MONTHS to complete :)I encrypted a 320GB HDD with a brand new windows partition as a test, that took roughly 6 hours with no overwriting enabled.On my old laptop, I had a 1Tb hard drive which complete in 2 hours with no overwriting enabled. However, having said that, it was in RAID so I'm not sure if that helped at all.