I have just brought a Pioneer 106 Writer, and thought I would try using a DVD-RW first to get thing hang of things. Used DVD X Copy Xpress to back up one of my DVD collection and burned it on the DVD-RW. It worked fine, then I erased the DVD-RW using Nero 6 which took 60 minutes. When I came to try another DVD backup the drive doesn't recognise the disc at all. I'm getting messages like "illegal disc". Does this mean I have a faulty DVD-RW?