I am trying to wipe an old laptops hard drive, it doesn't have a CD drive so have been using a USB to try and wipe the hard drive from the BIOS. I have been using http://www.dban.org/ which I installed as an ISO on the USB Stick. When ever I try to boot into this I get an error saying 'No operating system' Does anyone know of a way to wipe a hard drive? I also tried to boot into safe mode but I just stay on a constant loop. Thanks