the right drive for the right job. wd purple drives have been engineered specifically for surveillance, so they re able to withstand the elevated heat fluctuations and equipment vibrations within nvr environments. an average desktop drive is built to run for only short intervals, not the harsh 24/7 always-on environment of a high-definition surveillance system. a disruption to a drive could result in a failure that impacts multiple users, your security archive, or even the entire system. with wd purple, you get reliable, surveillance-class storage that s tested for compatibility in a wide-range of security systems. industry-leading storage. surveillance you can trust. wd is a worldwide leader in the hard drive industry. with wd purple surveillance storage, you have a drive engineered for high temperature, always-on surveillance systems so you can rely on quality video playback when you need it most. whether you re protecting loved ones or monitoring your business, wd purple offers performance you can trust. trust your view with allframe 4k technology missed frames and lost footage could be a serious problem when video surveillance needs to be retrieved. all wd purple drives are equipped with allframe 4k technology, which improves ata streaming to help reduce frame loss, improve overall video playback, and increase the number of hard drive bays supported within a nvr. features: engineered specifically for surveillance security systems. tuned for write-intensive, low bit-rate, high stream-count applications typical to most surveillance applications. prioritized write-operations for maximized surveillance performance. tler ata streaming support. product specifications