Ex. Dell. Insert the Kill disk (Usb Drive) turn the machine off, turn it back on while pressing F2, set the secure boot to disabled, turn UEFI OFF, Enable Legacy, select Usb Diskette from the Boot Order. Press F10 to save configurations. Kill disk boots up, then when select the settings, dod 3 verfication, 100%. We let it run, it can take 5 mintues to a couple days for it to complete. After it is finshed, we restart, and reversing what we did, (turn the UEFI back on, then select boot from Hard drive etc.. We restored it first, then wipe.