shred vs writing zeros to wipe a drive

[Stephen]

I would leave it at that and let it run.


On Sun, Aug 18, 2013 at 9:42 PM, keith smith <klsmith2020 at yahoo.com> wrote:

>
> Thanks for your feedback!  I did the 3+1 because that was the standard
> config w/o setting a flag to alert that.  Also note this is not my area of
> expertise.
>
> ------------------------
> Keith Smith
>
>   ------------------------------
>  *From:* Stephen <cryptworks at gmail.com>
> *To:* keith smith <klsmith2020 at yahoo.com>
> *Sent:* Sunday, August 18, 2013 9:03 PM
> *Subject:* Re: shred vs writing zeros to wipe a drive
>
> It really depends on the data on the drive. How impactful it would be to
> have that data get into the hands of someone else. And is the 12 hour shred
> going to equal that.
> I would say that if you are running a 3 pass shred another pass of 0s is
> not needed.
> Also note I think the dod  has a 7pass standard (my recollection on this
> is possibly out of date or just fuzzy).
> On Aug 18, 2013 8:19 PM, "keith smith" <klsmith2020 at yahoo.com> wrote:
>
>
> Hi All,
>
> I have an old computer that I am giving to a friend so I wanted to wipe
> the drives in preparation for that.
>
> The master is 250GB
> The slave is 1TB.
>
> I read a couple articles that suggested using a rescue disk and the shred
> utility to take care of this.  I also read that shred is not necessary to
> just write all zero's to the drive.
>
> The rescue disk I am using is DVD disk one of CentOS 6.3.
>
> I ran shred on the fist drive.  It took 4.5 hours to run 3 shred passes
> plus 1 that writes zeros to the entire drive.
>
> Command : shred -zv /dev/sda  (this was on the master disk)
>
> Then I ran : dd if=/dev/zero of=/dev/sda bs=16M
>
> In one of the articles it showed the above command with bs=1M
>
> Does the size of "bs" matter?
>
> Also what about the argument that shred is overkill?
>
> Thanks!!
>
> Keith
>
> ------------------------
> Keith Smith
>
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-- 
A mouse trap, placed on top of your alarm clock, will prevent you from
rolling over and going back to sleep after you hit the snooze button.

Stephen
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