I tried running CCleaner's Drive Wiper from a WinPE bootable USB stick and tried to erase the hard drive in a test notebook computer I have here and it did not work. It will not seem to erase the entire disk even if you select that option. It appears to only erase the free space. Is there a way to get the the erase entire drive feature to work from a bootable WinPE stick and erase another drive in a notebook or desktop? Does it skip doing the full erase if the target drive is bootable, even if it is not the one you are currently booted from?