Seagate Pipeline HD ST3500312CS 500GB 5900RPM 8MB Cache SATA II 3.0Gb/s 3.5" Internal Hard Drive (PC, RAID, NAS, CCTV DVR) [Certified Refurbished] -w/1 Year Warrany 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. 500GB Capacity, 5900RPM Rotation Speed, 16MB Cache Works for PC, NAS, NVR, Surveillance CCTV DVR 3.5" Internal Hard Drive, SATA2, Heavy Duty, Low Power & Quiet Passed Factory Diagnostic Software + RE-CERTIFIED by State-of-the-Art software - Full "Sector-by-Sector" test to ensure best HDD quality! ZERO Bad Sectors!