WD Purple drives are designed to meet the challenges of 24/7 video surveillance. These drives are specifically engineered for monitoring, capable of withstanding significant temperature fluctuations and device vibrations in NVR environments. An average desktop drive is only built for short intervals, not for the harsh 24/7 operational environment of a high-resolution surveillance system. With WD Purple drives, you get reliable surveillance-class storage that has been tested for compatibility with a variety of security systems. The exclusive AllFrame technology helps reduce frame loss and improve overall video playback.