The Western Digital WD Purple WD23PURZ is an internal 3.5-inch hard drive specifically engineered for the demanding environment of 24/7 surveillance systems. With a capacity of 2 TB and a SATA 6 Gb/s interface, it provides reliable storage for NVR and DVR setups, supporting up to 64 HD cameras across a maximum of 8 drive bays. To ensure smooth video playback, it utilizes AllFrame technology, which helps reduce frame loss during recording. This drive operates at 5400 RPM and employs Conventional Magnetic Recording (CMR) to maintain data integrity. It features a cache size of 256 MB and can reach sustained transfer rates of up to 175 MB/s, allowing for efficient data flow. Built for longevity, the unit has a workload rating of 180 TB per year and a mean time between failures of up to 1 million hours. Weighing 450 g and measuring 147 mm by 101.6 mm, it fits standard drive slots and operates within a temperature range of 0°C to 65°C, making it a dependable choice for security professionals and home users monitoring their property.