I want to make a backup copy of my Windows 7 Home Premium installation DVD (it's a Dell OEM reinstallation disk). It is a dual layer DVD of approx 5546 Mb, in other words too big to fit on a normal DVD. But the problem seems to be more that any ISO making software I have treied choked on the DVD. Is it is some sort of special format? How do I make a viable (preferably bootable) copy of the disk so I am not relying on my one and only original DVD?
Thanks in advance, David