Western Digital Purple Surveillance 2TB Hard Disk Drive.

WD Purple 5400 RPM Class SATA 64MB Cache 3.5 Inch Built for 24/7, always-on, high-definition security systems. With a supported workload rate of up to 180 TB/yr and support for up to 64 cameras, WD Purple drives are optimized for surveillance systems. Features Engineered for compatibility WD Purple surveillance hard drives are built for compatibility with industry-leading chassis and chip set manufacturers for seamless integration into your new or existing video surveillance system. Optimized performance for up to 64 cameras With support for up to 64 surveillance cameras per hard drive, WD Purple gives you the flexibility to upgrade and expand your security system in the future. Surveillance storage for peace-of-mind WD Purple Surveillance hard drives are designed for high temperature, always-on, surveillance security systems to help ensure reliability and quality video play back when you need it most. Specs Cache Memory Installed Size 64 Hard Disk Rotational Speed 5,400 rpm Hard Disk Form Factor 3.5 in Hardware Connectivity SATA 6.0 Gb/s Item Dimensions 5.79 x 4 x 1.03 in Item Weight 0.99 lb