[clue] secure erase techniques?

[Jim Ockers]

Mike,

If you use dd_rescue instead of dd then you get a progress bar.

There are some differences between dd_rescue and dd so RTFM carefully. :)

-- 
Jim Ockers, P.Eng. (ockers at ockers.net)
Contact info: http://www.ockers.net/msi.html


Mike Bean wrote:
> 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 
> <mailto: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
>     <mailto: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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