I have a Windows7 Ultimate machine. Amd phenom 2.3 quad core and 8 gigs of ram PC. Everything was burning fine as usual. All of the sudden the Imageburn buffer fills to about 74% and slowly drops and never fills back up leaving the device buffer going crazy. It wrote one disc 8.5dl verbatim that verfied ok but a burn that usually took about 30 mins now took 4 1/2 hours to finish. I have checked and confirmed DMA settings from previous posts, defragged drive which is a 500g drive with 470 gigs available only been running this machine for about 3 weeks so everything is clean. When i burn im only running imageburn and thats it no browsing no other programs running and i even tried in safe mode. Tried 3 different types of media Verbatim , Memorex , Sony. All had same issue which doesnt seem like a media issue due to it being the imageburn buffer not the device buffer. I also have two different optical drives a liteon and a sony optiarc even though i doubt they were the issue at hand. No clues as to what to do from here as most of the post and threads i read are XP DMA related problems. Any info would help. Thanks in advance!