Seagate SkyHawk 4TB SATA Surveillance SATA III 3.5″ Internal Hard Drive, 256 MB Cache, 5400 RPM, Up to 180 MB/s Sustained Transfer Rates, 1 Million Hours MTBF, Up to 64 HD Cameras | ST4000VX016

The 4TB SkyHawk Surveillance SATA III 3.5″ Internal Hard Drive from Seagate is designed to withstand the stresses placed on it in a 24/7 surveillance system with 1 to 16 drive bays. With support for up to 64 high-definition surveillance cameras, this 4TB hard drive can hold a large amount of data and gives you the ability to upgrade and expand your security system. Key Features 4TB Storage Capacity 3.5″ Form Factor SATA III 6 Gb/s Interface 256MB Cache Up to 180 MB/s Sustained Transfer Rates