WD offers the Power of Choice when it comes to equipping a surveillance system for home or business with the addition of the WD Purple™ NV hard drive. Designed specifically for NVR digital surveillance systems, the WD Purple NV hard drive adds support for systems with higher drive bay configurations and up to 64 HD cameras. The increased number of video streams and workload capability offered with the WD Purple NV hard drive allows scalability beyond the limitations of DVR systems where only the WD Purple drive is applicable.