Hitachi Ultrastar 7K3000 HUA723030ALA640 3TB 7200 RPM 64MB Cache SATA III 6.0Gb/s 3.5" Enterprise Hard Drive (Certified Refurbished) - w/1 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 a minimum one-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 Hitachi Diagnostic Software, ZERO Bad Sectors! RE-CERTIFIED by State-of-the-Art software - Full "Sector-by-Sector" test to ensure best HDD quality!