I have a Dell 8550 1Ghz, 120GB HD and 1GB Ram. I installed a Sony DRU-510A DVD+-RW. I used the IDE cable that came factory installed. The system already had a Samsung DVD-ROM installed. Now the problem is, when I check the settings under Device Manager for Primary IDE Channel the Device 0 displays as Current Transfer Mode "DMA Ultra 2" For Device 1 it displays DMA if Available and Current Transfer Mode "PIO Mode." I have uninstalled my primary IDE and windows found new hardware. I do not have Secondary IDE Channel in Device Manager. Also, when hardware is installed it shows Curent Transfer Mode to Not Applicable. Can someone please help me set my burner up in DMA mode? Does this problem have to do with settings on DVD Burner (ie. Slave, Master, CS?) Or is it a setting in the BIOS? Please help getting me on the right track. Thank you for all your help.