The WD40EJRX is part of Western Digital's Purple Surveillance series, offering a 4TB capacity for high-demand surveillance systems. It is equipped with a 3.5" SATA interface, operating at 6Gb/s, with a 64MB cache for improved performance. This model is tailored for the surveillance market, providing reliability for around-the-clock security monitoring and video recording. The drive optimizes performance for up to 32 HD cameras, and thanks to the exclusive AllFrame technology, it minimizes video frame loss and supports TLER (Time-Limited Error Recovery) for better error handling. The WD40EJRX is designed for durability and long-term reliability, ensuring the safety and integrity of recorded video, making it an ideal choice for surveillance DVRs and NVRs.