· Seagate SkyHawk 4TB HDD is 3.5 inch HDD interface with SATA 6Gb/s and 64 Cache (MB). Image Perfect firmware supports 24×7 surveillance-optimized workloads tuned to record about 90% of the time and play back video footage the remaining 10%, and supports more cameras recording at higher resolutions than traditional drives · Lower power consumption means a reduction in heat emissions, which improves reliability in surveillance solutions. Tarnish-resistant components help protect drive from environmental elements, increasing field reliability · Best-Fit Applications are Network Video Recorders (NVR), Embedded Surveillance DVRs (SDVR), Hybrid Surveillance DVRs, and Surveillance DVRs · 3 Year warranty of HDD. (Physical Damage and Burning are not covering in warranty.) · OS Compatibility: MICRO SOFT WINDOWS 7, MICROSOFT WINDOWS XP, LINUX ETC.