One jumper has to be set as "Master," and the other as "Slave." Most newer drives have an illustration somewhere on them, either on a decal or embossed, showing how. There is an order for the connectors on the ribbon cable, too. I think that the first one (gray) is for Master, and the other one (black) is for Slave--or the other way around, I really forget. --Steve At 6:27 AM -0500 8/8/05, Dan A Currie wrote: > I think I need to change the jumpers or something as it is NOT reading any of my older software CDs. Also, how do I set it, G4, up to use both the Phillips and Pioneer?