Try dban disk wipe.
"DBAN is a means of ensuring due diligence in computer recycling, a way of
preventing identity theft if you want to sell a computer,..."

http://dban.sourceforge.net/



"Wonderman" wrote:

> I just want to make it really hard and expensive for the casual pair of
> prying eyes to take a look. Thank you both.
>
>
> "sosrandom" <sosrandom.2ybkp6@no-mx.forums.net> wrote in message
> news:sosrandom.2ybkp6@no-mx.forums.net...
> >
> > -Some machines can recover data that's been written over only one or two
> > times, however. That's where secure delete standards, such as the
> > Department of Defense 5220.22-M, come in. According to this
> > specification, overwriting the drive sectors three times with specific,
> > different characters constitutes one pass. Many experts recommend seven
> > such passes to render the data completely unrecoverable. But reading
> > data that has been overwritten by even the simplest shredders requires
> > expensive hardware, so unless you're worried about professional sleuths,
> > such thorough overwriting probably isn't necessary.-
> >
> >
> > --
> > sosrandom
>
>