I have several machines, Windows, that need to have the data on the hard drives more seriously cleaned than just deleting the files and formatting it. I was told that you could write zeros or random numbers throughout the entire disk and that would normally be enough. That's perfect for me. How can I do this with Knoppix 3.8.1 ???

I have about 25 machines. So my thought is to boot with Knoppix, run a tool, turn off my computer and remove the CD. Then go to the next one.

Is there such a tool to do this?