i know! <br>I usually just use /dev/zero for day to day stuff, but if i've just got a drive from someone, or giving it away, I usually run it through a dcfldd wipe sequence of zero / urandom / zero just to be sure.. ^_^<br>
<br><div class="gmail_quote">On 11 August 2010 13:54, Tony Arnold <span dir="ltr"><<a href="mailto:tony.arnold@manchester.ac.uk">tony.arnold@manchester.ac.uk</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Bill,<br>
<div class="im"><br>
On Wed, 2010-08-11 at 11:12 +0100, Bill Cumming wrote:<br>
</div><div class="im">> Best way is probavly just to use the "dd" command:<br>
> If you run off of a live CD then just point "dd" to the drive instead<br>
> of a file.<br>
><br>
> Example: sudo dd if=/dev/urandom of=/dev/sda<br>
><br>
> That will overwrite the entire drive that's on /dev/sda with random<br>
> data destroying any Filesystem on that drive.<br>
><br>
> You should at least do multiple alternating runs of<br>
> "/dev/zero" (quick) and "/dev/urandom" (slow)<br>
<br>
</div>Only one run is necessary unless you think the CIA or GCHQ are<br>
interested in the data. Even then the equipment required to recover<br>
anything costs millions of pounds.<br>
<br>
You may want read about 'The Great Zero Challenge'[1] where a disk<br>
overwritten with zeroes using dd and the challenge was to recover the<br>
data. It ran from Jan 15th 2008 until Jan 15th 2009. Nobody took up the<br>
challenge!<br>
<br>
Regards,<br>
Tony.<br>
<br>
[1]<br>
<a href="http://hostjury.com/blog/view/195/the-great-zero-challenge-remains-unaccepted" target="_blank">http://hostjury.com/blog/view/195/the-great-zero-challenge-remains-unaccepted</a><br>
--<br>
Tony Arnold, Tel: +44 (0) 161 275 6093<br>
Head of IT Security, Fax: +44 (0) 705 344 3082<br>
University of Manchester, Mob: +44 (0) 773 330 0039<br>
Manchester M13 9PL. Email: <a href="mailto:tony.arnold@manchester.ac.uk">tony.arnold@manchester.ac.uk</a><br>
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</div></div></blockquote></div><br><br clear="all"><br>-- <br>Regards<br><br>Bill Cumming<br><br>Twitter: @s0l_uk<br>Skype: s0litaire<br>eMail: <a href="mailto:bill@s0l.co.uk">bill@s0l.co.uk</a><br>