And then format your HD twice or there will always be evidence of it if they want to find it.
There is another technique called "Flattening the box", this is where you physically write a 1 to each bite in every sector of the hard drive
![Blah blah :blah:](https://board.marlincrawler.com/Smileys/marlin/blah.gif)
if your that worried. sorry dorking out.