On Wed, Feb 13, 2002 at 10:33:33AM +0100, Helge Hafting wrote:
> Andreas Ferber wrote:
>
> > I don't know if any filesystem currently relocates blocks if you
> > overwrite a file, but it's certainly possible and allowed (everything
> > else except the filesystem itself simply must not care where the data
> > actually ends up on the disk).
> >
> A log-structured fs will write new blocks everytime, afaik.
Ext3 only does that on truncate in ordered/writeback mode and probably in
data journaling mode too.
> Ext3 with data journalling keeps copies of recently written data
> in the journal. Now, if you create a "secret" file and then overwrite
> it you'll still find a copy in the journal until the journal wraps
> It may not wrap if the next thing you do is umount/shutdown.
>
> A secure rm must know the fs it works with. A better solution
> is to overwrite the entire partition with garbage. The only
> perfect way is to destroy the magnetic surfaces though.
>
Yep, very true.
Phycally breaking the drive apart into pieces and then burning should
suffice.
Mike
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Feb 15 2002 - 21:00:57 EST