I have been trying to enable DMA for my CD writer (Yamaha 8x8x24 IDE). It is not working because DMA must be disabled in the Bios (1004c) for the computer to recognize the drive. Whever I try to enable any (Ultra) DMA mode, I get an error saying that the drive fails. The drive is the Master (and the only thing) on the primary IDE channel as my hard drive is using the Promise controller. Any suggestions?