Not quite sure if I understand your question. You have two HDD's (at what size) that you install in a docking station and you want to do what exactly with then in the docking station?
What I think you might be referring to is a RAID setup, in which you make 2 drives into a single drive. If your asking if that's possible using the docking station, that's best if you ask Thermaltake directly. If was were to take a guess at it I would say no because the docking station is setup as a portable device to hot swap drives as a temporary means to access and retrieve data. I don't think is was designed to be a permanent solution for housing a HDD. Again, I would ask Thermaltake.