5 in. WD Purple 2TB Hard Drive, 3. WD Purple drives are designed to meet the challenges of 24x7 video surveillance recording.With WD Purple drives, you get reliable, surveillance-class storage that's tested for compatibility in a wide range of security systems.
WD Purple 2TB Hard Drive, 3.5 in.. Internal, SATA, Purple Exclusive WD All Frame technology helps reduce frame loss and improve overall video playback These drives are engineered specifically for surveillance to help withstand the elevated heat fluctuations and equipment vibrations within NVR environments.