Seagate Constellation ES.2 ST33000651NS 3TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5" Internal Enterprise Hard Drive (Certified Refurbished) 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, 3.5" Internal Hard Drive (Heavy Duty) SATA 6Gb/s,7200-RPM Performance, 247 Reliability, Best-in-class Works for PC, Mac, RAID, NAS, CCTV DVR! Passed Factory Diagnostic Software + Full "Sector-by-Sector" test to ensure best HDD quality! ZERO Bad Sectors!