Dunno that one is BETTER than the other or not...I usually use master / slave 99% of the time and frankly there is some confusion as to EXACTLY what cs does...cuz I think different manufacturers have implemented cs in slightly different ways.
But lots of oems like compaq and gateway etc seem to like cs.
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"Even a fool is thought to be wise if he is silent"
I think by default, mine looks for both Masters first. I recall having them set Master/Slave on the same channel once and I added another drive to the second Master and it said I didn't have an array anymore. I had to do a little Ghosting and set them up Master/Master so I could add more drives as needed.
As it turns out there is no way in he** to get the sys to recognize
these new WD drives with the jumpers set to master, I had to set them as CS and all is well.