Thanks for your help. I will try to use a programa that I've found
through Google.

On 6 Jul, 23:46, Dennis Dow <den...@mybesteducation.com> wrote:
> Jim wrote:
> > All these steps do is a convoluted single pass overwrite. *If you have
> > information that you really want to be as hard as possible to recover, then
> > a seven times overwrite is what you need.
> > Jim
>
> I often hear people say that a 7 times overwrite is required. *I always
> answer “Show me.” *Do date no one has given me any recent research
> suggesting it’s required. *Even Peter Guttmann who did the recovery on
> MFM and RLL drives doesn't claim it's possible any more. *A single pass
> overwrite of data will remove the data. *7 times is an urban legend.
>
> Now with that said, the empty of recycle bin, and defrag will NOT remove
> sensitive data. *It's important to get a wipe program that can wipe
> freespace.
>
> Dennis