On Thu, Jun 29, 2017 at 8:53 AM, Man-wai Chang <[email protected]> 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

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