I just wanted to add another note about these systems - I added 3x SATA drives, one to each blade, and after doing so the blades wouldn't boot. Turns out the BIOS juggled the boot order of the HDs when I added a second one. A quick visit into the BIOS and changing the boot order for HDs corrected that. (HD boot priority/order in BIOS, as I recall)
In my three blade chassis, each blade is wired to four drive trays, and each blade is wired to one complete row of trays. Looking at the unit in front, the top row of trays are for blade one, the second row of trays are for blade two, and the bottom row is for blade three/four, as described on the sticker inside the system cover.
gmac715 - I wonder if you'd have better luck with your drives set as RAID? Also, I'd suggest investigating the cabling from the front plate to the blade MB - from memory I think there are more SATA slots than are wired to the front panel (6?), they may have been mis-wired at assembly, and if the system only had one HD installed at assembly, the bad wiring would not have been caught.
Is your system a C6005 like mine or a C6100/C6105 as you describe it?