[GRLUG] Disk scrubber

[Michael Mol]

I read somewhere that shred's "doing more" is targeted at older-style
hard drives, like FM, MFM and others, and most of its routines aren't
any more effective on a modern disk than a simple overwrite.

In essence, most of shred's passes were each designed for a different
style drive.

Source:
http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html

On 7/24/06, Tim Schmidt <timschmidt at gmail.com> wrote:
> On 7/24/06, Michael Mol <mikemol at gmail.com> wrote:
> > dd, multiple passes, if I want to keep the drive.  .223, if I don't.
> >
> > shred's nice, but slow.  On modern drives, the following works just as
> > well for me:
> >
> > dd if=/dev/zero of=/dev/hdfoo
> > dd if=/dev/random of=/hdfoo
> > dd if=/dev/zero of=/dev/hdfoo
>
> Shred's slower because it does quite a bit more to hide / destroy data.
>
> > I still use shred, but only on individual files.  I use ext3, so I
> > have to get around the journal:
> >
> > chattr +S foo.odt
> > shred -fu foo.odt
>
> Shred works correctly on ext3 partitions mounted with default options.
>  No 'getting around the journal' nescessary.
>
> --tim
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-- 
:wq