I tried playing around with the book type and the max automatic speed and when i do that I get power calibration errors. I use verbatim+R DL. Ive tried burning at 1x, 2.4x, 4x. Im trying burning at 8x as i type this. Il let you know if anything happens. I get write error all the time. But then again this is the first time ive ever tried burning DL's.