I have Dual layer DVD's, I want to change the boot image, I already have the image, and made an ISO of the original CNDV-50MT DVD that came with my system. How do I go about editing the ISO so the new image is on them and have it sucessfully burn a new DVD? I tried just copying the files into a folder, changing the image and reburning the files on a new disc, but that says "invalid disc" when it goes in... how do you guys do it? thanks!