The WD42PURZ is part of Western Digital's Purple Surveillance HDD line, designed specifically for surveillance and security systems. This 4TB HDD offers ample storage for high-definition surveillance footage, incorporating AllFrame technology to reduce video frame loss and ensure smooth, uninterrupted playback. It operates on a SATA interface with CMR (Conventional Magnetic Recording) technology, which provides reliable, long-term storage for 24/7 surveillance environments. Suitable for DVRs, NVRs, and other video recording devices, it supports a workload rate of up to 180TB/year and can operate seamlessly in systems with up to 64 cameras. The WD42PURZ combines high capacity, reliability, and performance, making it an ideal choice for surveillance applications demanding continuous, high-quality video recording.