WD Purpledrives are engineered specifically for surveillance to help 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. With WD Purple, you get reliable, surveillance-class storage thats tested for compatibility in a wide range of security systems, and some of our latest models (WD22PURZ, WD42PURZ, and WD63PURZ) have improved power efficiency. Exclusive AllFrametechnology helps reduce frame loss and improve overall video playback. Western Digital is a worldwide leader in the hard drive industry. With WD Purplesurveillance 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 youre protecting loved ones or monitoring your business, WD Purpleoffers performance you can trust. All WD Purpledrives are equipped with AllFrametechnology, which improves ATA streaming to help reduce frame loss and improve overall video playback, within a multitude of security video solutions. WD Purpledrives feature a workload rating of up to 180TB/year2 - up to three times that of desktop drives - to handle the unique demands of mainstream video surveillance DVR and NVR systems.