Again, this is anecdotal evidence, but generally speaking the 2tb drives seem to be more stable than the 3 tb drives. Of course, you don't need UEFI to use the 2tb drives, so it could just be that some people don't understand how to use their hd's properly. Regardless, I have both a 2tb internal WD and a 3tb external seagate and they're both working great, though it is admittedly light use for both.