you should be able to jump and place your eide devices however you want, but quantum is strange, like that. with quantum i found it is best to config both your jumpers to CS and place your drives accordingly, (CS )is cable select =position on cable, so end pos is master, mid position is slave, Each EIDE conector can have 2 devices, so 4 devices are possible, but each cable is independent in that each has the master slave relationship. CS just uses position to denote M/S. Win, by default, seeks the boot partition on the master device on the primary cable. watch jumper position, cause they are dif from HD to HD, quantum, may be no jumper = master? also,what is ideal is to get your udma devices on one or like speed cable if you have dif speeds. usually the ide speed reads at LCD sooo. good luck