WD Purple 3.5"" 4TB SATA 6Gb/s 5400rpm Internal Surveillance HDD

Western Digital Purple Internal Hard Drive 3.5 SATA 6Gbs 256MB HDD: 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/year and support for up to 64 cameras, WD Purple drives are optimized for surveillance systems. 

• WD Purple drives have been engineered specifically for the extreme demands of high temperature, 24/7 surveillance systems.
• From a worldwide leader in the storage industry, WD Purple is engineered for quality video playback when you need it most.  
• WD Purple drives are optimized to support up to 64 cameras, giving you flexibility to upgrade or expand your security system.
• With a wide range of industry-leading enclosures and chipsets supported, you're sure to find the configuration and compatibility that's right for your NVR.
• Low power consumption is a must in a high-temperature, always-on surveillance environment. IntelliSeek technology helps reduce damaging ambient noise and vibrations.