I'm in need for extra file storage and among the 2TB SATA choices available I'm considering the Seagate Barracuda ST2000DM001. There are also the Western Digital "green" drives which I have several of already (and after several years had no problems at all with), but they're relatively slow and are known for their constant automatic head parking/unparking "feature" which is hard to disable (I'm on a Mac and most hard drive configuration software is for some strange reason only available for Windows/DOS) and will (many say) kill the drives prematurely.
The Seagate mentioned above seems like a better choice, but I'm puzzled as I've picked up on reviews/comments saying that there are different versions of this particular drive with vastly different performance specifications (but with the same model no.). Naturally I want the best performance, so how do I distinguish the different versions before buying?
Also, any comments and personal experience with this drive or other recommendations are highly welcome.