Help with product identification

Hello All,

As you can see from the topic title I'm a bit green around the gills :D

I'm looking to buy a new pair of hard drives to expand the capacity of my Readynas. At the moment I have two 1Tb drives. So I looked on the hardware compatibaility list (http://www.readynas.com/?page_id=82) to check which ones I could use... unfortunately for me a simple mind is easily confused!

So...I'm hoping someone can provide me with insight into how to correctly determine the correct product name/spec/number for my Readynas.

I've looked underneath it and it says Readynas Duo. It then goes on to say RND2110 V2. So my question is is it a Readynas Duo or a Readynas Duo V2?

From what I can make out the answer will determine if I can go up to two 3Tb drives or have to make to with only 2Tb drives.

Any help greatly appreciated!