DBAN aka Darik's Boot and Nuke, http://www.dban.org/
EDIT: any secure wipe is indeed gonna take while because it writes 1s and then 0s and then 1s again onto each byte so as to not leave any "magnetic residue" for lack of better words. And yes 1 wipe/pass is/can usually be enough but, multipass gaurentees it.
I don't know if it was my UEFI bios that was the problem, but I could not get dban to work. It doesn't seem to like any USB hubs attached to the machine or ACHI enabled or god knows what else. After spending an hr of trial and error, (well an hr of error more to the point) i just said to the heck with this.
Anyway, probably good for a boot drive, IF you can get it to work on modern hardware. But for a secondary for which i wanted to wipe, the disk wipe software i mentioned above is what you want !
You're looking at about 6hrs for a one pass on a 2TB.
It doesn't install into the OS like Eraser has. Just an exe, run it, choose your drive (as long as its not the main o/s boot drive) select your method of wipe, el voila ! Couldn't be simpler ! Why waste your time, on your hands and knee's unplugging everything out of your USB ports, unplugging any additional drives internally, fart arsing around in your bios just to get dban to work, when you can use this instead !