[Cialug] Wiping server hard drives

[Josh More]

Oh.

On modern hardware, you don't actually need shred for a secure delete.

http://www.anti-forensics.com/disk-wiping-one-pass-is-enough
http://www.anti-forensics.com/disk-wiping-one-pass-is-enough-part-2-this-time-with-screenshots

So look at dd + /dev/zero.  Should be faster.

-Josh

On Wed, Oct 19, 2011 at 5:04 PM, Hasler, Chris <
ChrisHasler at alliantenergy.com> wrote:

> I should have mentioned in my first post that I have used DBAN in the past,
> but now I'm looking for other suggestions since it hasn't been recognizing
> the controllers in any of the servers I've had to wipe now.
>
> As mentioned I've been experimenting with shred.  I've been booted to the
> CentOS-6.0-x86_64-minimal.iso and selected the option for Rescue.  I don't
> enable networking or scan for the existing file system just jump into the
> shell.  Run a fdisk -l to see what disks are configured, /dev/sda for
> example, then run shred -vfz -n 3 /dev/sda.  This seems to do the same as
> the dd if=/dev/urandom of=/dev/sda bs=1G command but will run three
> iterations, well four actually since the -z option does a final overwrite
> with zeros at the end.
>
> Chris H.
>
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