Uncompromising Storage with a WD Purple Surveillance Hard Drive WD Purple drives 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 that’s tested for compatibility in a wide range of security systems. Exclusive AllFrame™ technology helps reduce frame loss and improve overall video playback. Western Digital's Exclusive AllFrame Technology All WD Purple drives are equipped with AllFrame technology, which improves ATA streaming to help reduce frame loss and improve overall video playback, within a multitude of security video solutions. Enhanced Workload Ratings WD Purple™ drives feature a workload rating of up to 180TB/year - up to three times that of desktop drives - to handle the unique d