Thanks for both of your suggestions. I've read about Verbatim, are they that much better?
@Moth3r: #2 is unlikely, as this is the same type of disc that came in a bundle which I had burned one in about a year ago. #3, I don't see a filter driver load option in ImgBurn. Does this mean I have an old version?
Thanks again - I can easily see this being what vbangle said though, as this is a standard crap DELL burner.