The Western Digital WD Purple WD11PURZ is an internal hard drive specifically engineered for the demanding environment of 24/7 surveillance recording. With a capacity of 1 TB and a 3.5-inch form factor, it integrates into DVR and NVR systems via a SATA-3 interface. The drive utilizes CMR recording technology and a 64 MB cache to maintain steady performance, spinning at 5400 RPM to balance efficiency and reliability. To ensure smooth video capture, this model features AllFrame technology, which reduces frame loss and improves playback quality. It is built to handle a workload of up to 180 TB per year and supports the simultaneous connection of up to 64 HD cameras across a maximum of 8 drive bays. With an MTBF of up to 1 million hours, the drive is designed for long-term stability in temperatures ranging from 0°C to 65°C. Weighing approximately 450 g, it provides a dependable storage solution for those needing constant, high-definition security monitoring.