More cameras. More clarity. More surveillance.   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.   The Right Drive for the Job WD Purple drives have been engineered specifically for the extreme demands of high temperature, 24/7 surveillance systems.   Performance You Can Trust From a worldwide leader in the storage industry, WD Purple is engineered for quality video playback when you need it most.   Expand Your View to 64 WD Purple drives are optimized to support up to 64 cameras, giving you flexibility to upgrade or expand your security system.   Seamless Integration With a wide range of industry-leading enclosures and chipsets supported, youre sure to find the configuration and compatibility thats right for your NVR.   Less Is More Low power consumption is a must in a high-temperature, always-on surveillance environment. IntelliSeek technology helps reduce damaging ambient noise and vibrations.   What is the difference between a desktop drive and a WD Purple drive? The WD Purple drive is designed specifically for 24/7 DVR and NVR surveillance solutions and is optimized with AllFrame 4K™ technology for system playback and performance. WD Purple drives support 3x the workload rating of desktop drives, making them more capable of handling the higher demands of video surveillance systems.   Easy backup and upgrade Acronis True Image WD Edition software, available as a free download, can clone drives and backup your operating system, applications, settings and all of your data. Specification Type of Drive: AV/CCTV Series: WD Purple Form Factor: 3.5\"\"\"\" Capacity: 4 TB Interface Type: SATA Interface Speed: SATA III - 6Gb/s Flash Memory Capacity: - Speed: 5400 RPM Cache: 64 MB Seek Time: IntelliSeek Condition: New Weight: 0.6800 kg Dimensions: 26.1 x 147 x 101.6 mm Package Type: OEM Package Weight: 0.6500 kg Warranty: 3 Years