The Seagate ST4000VX007 SkyHawk 4TB SATA Hard Drive is optimised for DVRs and NVRs, SkyHawk surveillance drives are tuned for 24x7 workloads in capacities up to 10 TB. Only Seagate has been making drives specifically for surveillance storage for ten years. Seagate SkyHawk surveillance drives are built to keep systems in the field longer and reduce the need for post-deployment support.