[clue] secure erase techniques?

[Mike Bean]

How long would I need to leave this running?   cat /dev/urandom > /dev/sda1
's been going for long about 10 hours now.  Is this something that I'll need
to abort or does it terminate on its own?

On Tue, May 31, 2011 at 9:04 AM, chris fedde <chris at fedde.us> wrote:

> Raymond,
>
> What does the magic block size do?
>
>
> I'd go with two passes of "cat /dev/urandom > /dev/sdX" as root.
>
> On Tue, May 31, 2011 at 8:51 AM, Raymond DeRoo <rderoo at deroo.net> wrote:
> > Mike--
> >
> > In short, I'm giving one of my older PC's to a friend's friend.  One of
> > those, I don't need it, things.  In any case, in terms of secure
> destruction
> > of drives, my father's always taught me to disassemble the drives and
> throw
> > the heads and the platter out separately.  Can't do it here, they need
> the
> > drives, so I thought I'd ask for advice in case we have members who might
> > know a thing or two about this sort of thing.  I figured I'd probably
> just
> > boot it to a live CD and nuke the partitions, and that's probably enough,
> > after all, I don't need like a military-grade erase, but I'll settle for
> > making it @#$@#$@$ hard to recover.  Any suggestions are welcome.
> >
> >
> > # dd if=/dev/urandom of=/dev/sda bs=387 count=<size of disk in bites> /
> 383
> > Recover from this *IS* still possible, but generally requires someone who
> is
> > *VERY* knowledge about drives to do as such.
> > .r
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