The Hitachi 2tb drives are really good, very comparable to the Samsung F4. They are 7200rpm as compared to the 5400 and 5900 of WD and seagate and they run cool as a cucumber even at that speed. Worth paying upto Rs 500 more for this difference alone. And the WD with the advanced format restrictions have become useless for NAS boxes while the Seagates become really hot even at 5900rpm !