ecshandle,
The Sanitize Hard Drive tool is written to DOD Sanitize specs. Any recovery efforts on a drive that has been Sanitized will fail.
In this method there are 3 write passes done on the entire hard drive, pass 1 and 2 are specific, different patterns. Pass 3 is a random pattern and pass 4 is to verify the random pattern is written to the entire drive.
-Fred