I'm looking to put a 5th hard drive into my mac pro and I was wondering if those two extra SATA plugs on the motherboard were good to go, or if there's something I should know. I've checked the drive sled in the 2nd optical bay (where I plan to put my 5th drive) and it looks like it's got scew holes ready for 3.5" drives! The cables can run via the hole in the left front septum (looking at the front of the Mac pro) separating the PCI area from the optical/PSU area. I have an extra internal SATA cable an a molex Y-cable, so I could do this today if I wanted to. I'd like a final word on the extra sata ports though.