The Western Digital WD Purple 3TB surveillance hard drive is specifically designed for 24/7 continuous operation in security systems and network video recording applications. This 3.5-inch internal hard drive offers 3 TB of storage capacity with advanced AllFrame 4K technology, which reduces frame loss and improves video playback performance. The drive features specialized firmware tailored for the demanding workloads of always-on surveillance environments and supports up to 64 camera systems with optimized recording capabilities. With WD's exclusive HelioSeal technology for enhanced reliability and lower power consumption, this hard drive operates at 5400 RPM and has a 64 MB cache buffer. It maintains stable performance across a wide temperature range of 0°C to 65°C and effectively handles vibrations in multi-bay enclosures. The 3.5-inch form factor measures approximately 147 mm in width, 101.6 mm in depth, and 26.1 mm in height, weighing 670 grams. The interface connection is via SATA 6 Gb/s, compatible with most modern surveillance systems and NVR devices. With a workload rating of 180 TB per year and a mean time between failures of 1 million hours, this drive provides the necessary durability for continuous recording applications in private security and commercial surveillance installations.