The Seagate ST4000VX000 Surveillance HDD SATA hard drive is the industrys only surveillance-optimised hard drive platform with 4TB storage capacity and has been tested and tuned for the high write-cycle workloads making it ideal to use for video surveillance storage systems. 1TB-per-disc technology takes your surveillance storage further with lower cost/GB to support HD resolutions enhanced performance and best-in-class support. SINGLE PACK