Select 12x(and have tried two different 12X media) and begin the burn. For about one second in the recording screen it shows 12X, then drops to 4X and stays there. When I burn a CDRW(data) at 10X, it works fine. Using Adaptec Easy CD 4. Have only tried burning audio CD-R's so far-no data, although I don't think it will matter. Have had CD-ROM and CD-RW on and off DMA. No difference. On different channels also. Never made a coaster-works fine. Would just like to burn at 12X like it should.