Intel and third party busmaster drivers can cause issues. Both James and Olli (the original author of Clonecd) say to do this step if you're having issues with your ide burners. (I could write a much longer explanation, but you only wanted two sentences. And I'm a bit busy). By the way, I have a Plextor 760a as well. I burn the MKM 001 stuff at 4x with it without any issues (use Plextools to set the booktype automatically to "dvd-rom"). Excellent burn quality . . . I would try burning again. If you still have issues, then ensure you're using standard ide busmaster drivers.