HGST Ultrastar 3TB 7200 RPM 64MB Cache SATA III 6.0Gb/s 3.5" Internal Hard Drive for NAS, RAID, Surveillance Storage -HUA723030ALA640 (Certified Refurbished) w/3 Year Warranty This Certified Refurbished product is tested and inspected to look and work like-new, with limited to no signs of wear. The product comes with relevant accessories and 3-year warranty. 3TB Capacity, 7200RPM Rotation Speed, 64MB Cache,SATA III 6.0Gb/s, Enterprise Grade, Heavy Duty Works for Servers, PC, Mac, RAID, NAS, Surveillance CCTV DVR 100% Tested & Passed HGST Diagnostic Software, ZERO Bad Sectors! Factory Sealed Bag, Zero Power Hours, 3 Years Warranty from Reseller