Western Digital Purple 4TB Surveillance Internal Hard Drive

The Western Digital Purple 4TB Surveillance Internal Hard Drive (WD44PURZ) is purpose-built for always-on security and surveillance environments, making it a reliable choice for DVR and NVR systems that demand continuous, round-the-clock operation. Unlike general-purpose desktop drives designed for intermittent use, the WD Purple 4TB is engineered to handle the elevated heat fluctuations and mechanical vibrations common in multi-bay security enclosures. At the heart of its surveillance capability is Western Digital's AllFrame technology, which improves ATA streaming to help reduce frame loss and maintain consistent video playback across a wide range of security video solutions. This makes the WD Purple 4TB particularly well-suited for installations where uninterrupted footage is critical, whether for home security or commercial monitoring. The drive supports up to 64 single-stream HD cameras, and is also compatible with many modern cameras that transmit multiple streams to enable basic AI functionality — giving you the flexibility to scale or upgrade your surveillance setup over time. A workload rating of up to 180TB per year — up to three times that of typical desktop drives — means it can handle the sustained, high-write demands of continuous video recording. Western Digital Device Analytics (WDDA) provides proactive storage management by surfacing parametric operational and diagnostic data, allowing system administrators and integrators to monitor drive health and address potential issues before they become critical. Tarnish-resistant components and support for more than eight bays allow the WD Purple 4TB to operate reliably even in demanding physical environments. The drive carries a 3-year limited warranty from Western Digital. Verified Specifications: - Capacity: 4TB - Form Factor: 3.5-inch - Interface: SATA - Cache Size: 128MB - Maximum Transfer Rate: up to 175MB/s - Recording Technology: CMR (Conventional Magnetic Recording) - Rotational Speed: 5400RPM - Operating Temperature: 0°C to 65°C - Non-Operating Temperature: -40°C to 70°C - Workload Rating: up to 180TB/year - Camera Support: up to 64 single-stream HD cameras - MTBF: up to 1,000,000 hours - Warranty: 3 Years Limited - SKU / Part Number: WD44PURZ