I had read the maintenance c_04205252.pdf, but that made me want to make sure I would be getting the 6Mbit sata on the drives I wanted to be as fast as possible, but I could not be sure where those were. I had hoped it would be in the 3.5 inch bays. I guess I was looking for some confirmation that was the case without trying to figure out how to trace the cabling on the side opposite the removable cover.