Thanks for your quick reply. I will get a lens cleaning disc and try that. I couldn't update the firmware myself so I sent the rewriter to a company called SVP communications and they did it for me. They didn't have time to try lots of different discs but they told me that Datawrite Titanium discs definitely worked and I have been using them successfully ever since (although I have tried some different brands, including Verbatim, and they didn't work.) All the time I have been using IMGburn successfully, I have been using the Datawrites.
Your issue could actually be solved just by getting better media. CMC MAG AM3 is pretty much crap. Go for Verbatim +R discs that have the disc ID MCC.
