Here’s a two step process to easily create a bootable DBAN USB dive to permanently erase a hardrive.
Step1- Download the latest ISO from DBAN:
http://www.dban.org/
Step2- Download and run the “Universal USB Installer”, select DBAN from the drop down list:
https://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/
Reference:
https://www.pendrivelinux.com/install-dban-to-a-usb-flash-drive-using-windows/