Wd Purple drives are built for 24/7, always-on, high-definition security systems. Wd Purple surveillance storage feature Western digital’s exclusive all Frame technology, so you can confidently create a security system tailored to the needs of your business. Using all Frame technology, WD Purple drives improve video capturing and helps to reduce errors, pixilation, and video interruptions that could happen in a video recorder system. Wd Purple drives have an enhanced workload rating** that supports systems designed for 24×7 video recording with up to 64 cameras. Workload Rate is defined as the amount of user data transferred to or from the hard drive. Workload Rate is annualized (TB transferred ? (8760/ recorded power-on hours)). Workload Rate will vary depending on your hardware and software components and configurations. Operating Temperature 0 to 65 Degrees Celsius and Non-operating Temperature -40 to 70 Degrees Celsius.