I currently have two hard drives, a cd-rom and a zip drive. There are only two IDE controllers on the motherboard each which supports two devices. If I want to add a DVD burner to this system, is it just a matter of installing a PCI controller card? If so, and the DVD burner is the only device attached to this card, do I set it to Master? Also, how do I know whether to get an Ultra ATA/100, Ultra ATA/66 or Ultra ATA/33 controller card? Does it matter when connecting a DVD burner or only when connecting a hard drive?