Seagate SkyHawk 3TB 3.5" Surveillance HDD for use in NVR/DVR, SATA 6Gb/s, max. sustained transfer rate 180MB/s, cache 256MB, average operating/idle power 3.7W/2.5W, MTBF 1m hours, WRL 180TB/year, SkyHawk Health Management and Rescue Data Recovery Services included (ST3000VX015)