i know! 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.. ^_^
On 11 August 2010 13:54, Tony Arnold <tony.arn...@manchester.ac.uk> wrote: > Bill, > > On Wed, 2010-08-11 at 11:12 +0100, Bill Cumming wrote: > > Best way is probavly just to use the "dd" command: > > If you run off of a live CD then just point "dd" to the drive instead > > of a file. > > > > Example: sudo dd if=/dev/urandom of=/dev/sda > > > > That will overwrite the entire drive that's on /dev/sda with random > > data destroying any Filesystem on that drive. > > > > You should at least do multiple alternating runs of > > "/dev/zero" (quick) and "/dev/urandom" (slow) > > Only one run is necessary unless you think the CIA or GCHQ are > interested in the data. Even then the equipment required to recover > anything costs millions of pounds. > > You may want read about 'The Great Zero Challenge'[1] where a disk > overwritten with zeroes using dd and the challenge was to recover the > data. It ran from Jan 15th 2008 until Jan 15th 2009. Nobody took up the > challenge! > > Regards, > Tony. > > [1] > > http://hostjury.com/blog/view/195/the-great-zero-challenge-remains-unaccepted > -- > Tony Arnold, Tel: +44 (0) 161 275 6093 > Head of IT Security, Fax: +44 (0) 705 344 3082 > University of Manchester, Mob: +44 (0) 773 330 0039 > Manchester M13 9PL. Email: tony.arn...@manchester.ac.uk > > > > -- > ubuntu-uk@lists.ubuntu.com > https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk > https://wiki.ubuntu.com/UKTeam/ > -- Regards Bill Cumming Twitter: @s0l_uk Skype: s0litaire eMail: b...@s0l.co.uk
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