Capacity Optimized Enterprise Hard Drive for Bulk-Data Applications, Best-in-class rotational vibration tolerance ensures consistent performance 4TB, 128MB Cache, 7200RPM, SATA III 6.0Gb/s - Designed for 24/7/365 Heavy Duty Works for Any SATA Server, NAS, RAID, PC/Mac, CCTV DVR, Surveillance System Bare Drive Only, Single Pack, (No Screws, Cables or Accessories included) -Friendly Reminder- Please FORMAT HDD on system in order to be detected/shows on system. 3 Year Warranty from Reseller, Worry free Return! 100% Full Refund