HGST Deskstar NAS 7K4000 HDN724020ALE640 2TB 64MB Cache 7200RPM SATA III 6.0Gb/s 3.5" Internal Desktop Hard Drive - w/1 Year Warranty 2TB Capacity, 7200RPM, 64MB Cache SATA III 6.0Gb/s, (Heavy Duty) 1 million hours MTBF 3.5-inch Internal Hard Drive For PC, Mac, NAS, RAID, CCTV DVR 1 Year Warranty from Reseller, Worry Free Return! 100% Full Refund