I have tried both ways and it still does it. I prefer creating the disk all at once instead of creating the file first. Neither is working. I have successfully created Blu-ray discs just a month or so ago using the same kind of BD-R discs I am using now, so I know it’s not the media. It never gets to that point anyway. 2x burn speed. I am using Windows XP Professional. I had this error msg. once before and I THINK I re-installed DVD Architect to get it working again, but not 100% sure. I don’t want to keep having to re-install software if that will even fix it again. Thanks for any assistance!