Will my early 09 MacPro support 3Tb internal drives?

As my machine is filling up and 3Tb drives have become available, the question arises: Can I install, and utilize the full capacity of 3Tb on my early '09 MacPro?

I'm looking at a couple of 3Tb WD blacks to replace the original 1Tb's that came with the machine. All my bays are filled.

Thanks for any pointers...

gf