Surveillance Hard Disk Drives Available in 1TB, 3TB, 4TB, and 6TB Sizes. With IntelliSeek technology, WD Purple drives are able to calculate optimum seek speeds; this keeps power consumption low so ambient noise and vibrations are at a minimum With a high workload rating WD Purple is designed to handle the distinct demands of contemporary video surveillance DVR and NVR systems The WD Purple has wide compatibility along with seamless integration WD Purple drives have been engineered specifically for the high demands of high temperature, 24/7 surveillance systems From one of the 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, youre sure to find the configuration and compatibility thats right for your NVR Low