[ubuntu-uk] Shredding HDD data
glen.mehn at oba.co.uk
Wed Aug 11 13:31:53 BST 2010
If you really want to do something like this, you'd need to write a
bit of C or something that outputs 1s and compile it. You could, I
suppose, in python (or even bash) do something like
though if you do the equivalent in C (or anything compiled) as it'll be
much faster, then
runYourProg | dd of=/dev/(yourdevice)
but I haven't a clue as to why you'd want to do this. It'll still be
slower than using /dev/zero
(unless, I suppose, you write your own kernel module to create it?)
On 11/08/2010 12:41, Bill Cumming wrote:
> 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
> <mailto: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.
> ubuntu-uk at lists.ubuntu.com <mailto:ubuntu-uk at lists.ubuntu.com>
> Bill Cumming
> Twitter: @s0l_uk
> Skype: s0litaire
> eMail: bill at s0l.co.uk <mailto:bill at s0l.co.uk>
e: glen.mehn at oba.co.uk | t: @gmehn
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