On Thu, Jun 29, 2017 at 8:53 AM, Man-wai Chang changmw@gmail.com wrote:
I use dd to wipe hard disk, and the bundled memtest86 to test RAM in new PC builds. :)
While dd is okay to blank out a disk, extreme techniques could still recover some data. You might want to check out "scrub" also available in most Linux distros, and some live CD/DVD/USB sticks:
http://manpages.ubuntu.com/manpages/trusty/man1/scrub.1.html