[ubuntu-uk] Shredding HDD data

Bill Cumming bill at s0l.co.uk
Wed Aug 11 12:41:05 BST 2010

Quick question:
With dd (and dcfldd) it's east to write "0" (zeros) out to a drive but how
can you write just *1" (ones) out instead?

On 11 August 2010 12:33, Vince Marsters <vince at marsters.co.uk> wrote:

>  On Wed, 2010-08-11 at 12:15 +0100, John Matthews wrote:
> What about hd you are still using, but have deleted stuff on them. Is there
> any way to bring that back, or even completely delete it?
> I had a program for windows when i used it, but I cant find anything for
> linux.
> For data recovery you can use testdisk (its in the Universe repo for
> Lucid).
> As for completely delete it then the only way to be 100% certain is to
> physically destroy the drive but I have been informed by a KrollOntrack
> employee (they do commercial data recovery as well as commercial erasing
> solutions) that 3 overwrites with different data stops them from recovering
> data from a drive.
> Also it is important to make sure that when doing secure erases that the
> bit pattern is different for each wipe (e.g. if you write zeros on the first
> pass then there should be no zeros in the second). Using one of the Gov
> approved schemes will usually do this.
> For most home users a single random wipe will be more than enough as this
> prevents most people getting at any of the data.
> Vince
> --
> ubuntu-uk at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk
> https://wiki.ubuntu.com/UKTeam/


Bill Cumming

Twitter: @s0l_uk
Skype: s0litaire
eMail: bill at s0l.co.uk
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