Looking to fit 3TB Enterprise drives to ReadyNAS Duo or NV+

In response to my original question, I have taken the plunge and am currently running two 3TB Seagate enterprise class drives in a new NV+ V2 without problem thus far. I have copied about 500GB of files to it from my old Duo so far, it hardly blinked (apart from an odd permissions problem on a few of the files, still trying to resolve that, I can only imagine it is something on the Duo end).

The drives are Seagate ST33000650NS, they run at around 40 degrees C when idle and are quieter than the 1TB ST31000340NS drives I have in the Duo V1.

The NV+ V2 runs very quiet considering the size of the fan, perhaps with four drives in it chugging away the fan will run faster, currently it runs at a leisurely 1365 RPM, the smaller fan in the Duo runs at around 1705 RPM.

I did look at Seagate's 4TB enterprise class drives but they are ridiculously expensive, I don't know what critical systems they would be worth installing in with today's virtualisation and RAID technology, certainly not my home NAS. I bought a single Hitachi DeskStar 7K4000 4TB drive as a general dumping ground for huge disk images and backup drive, which I placed in a MacAlly G-S350SUAB USB2/Firewire 800/400/eSata case, very stylish! I had to buy this new external case as none of my others were able to address anything over 2TB (poor show, hardware manufacturers!), a pitfall I fell into hook line and sinker, and it's surprising just how few high quality cases there are which have Firewire 800 AND support for 4TB+ hard drives.