3 TB Western Digital Purple Surveillance Hard Drive Designed for Performance WD Purple drives are optimized to support up to 64 cameras, giving you flexibility to upgrade or expand your security system. The WD Purple drive is designed specifically for 24/7 DVR and NVR surveillance solutions and is optimized with AllFrame 4K™ technology for system playback and performance. WD Purple drives support 3x the workload rating of desktop drives, making them more capable of handling the higher demands...