If you don't need (or can't afford) The 3TB at around between £85 - £90 (i got it for £78 through Flubit) then you may want to get this for a NAS and it's currently 1p off it's lowest ever price.
WD Red hard drives are designed and tested for compatibility in the unique 24x7 operating environment and demanding system requirements of home and small office NAS.
Western Digital claims that these tweaks result in a 35 per cent MTBF (mean time between failures) improvement over standard desktop drives, and is quick to point out that the optimisation ultimately reduces the long-term cost of NAS ownership
Original Western Digital Products
Ships in Certified Frustration-Free Packaging