WD Purple 4TB 5400RPM 128MB Cache SATA 6Gb/s 3.5" Surveillance HDD Hard Drive (WD44PURZ)

The Western Digital WD Purple 4TB surveillance internal hard drive (model WD44PURZ) is a purpose-built 3.5-inch storage drive engineered to meet the demanding challenges of continuous 24/7 video recording. Tailored specifically for high-definition security environments, it withstands elevated heat cycles and mechanical vibrations inherent to multi-bay NVR and DVR installations where standard desktop drives would quickly degrade. Utilizing Conventional Magnetic Recording (CMR) technology, a 5400 RPM rotational spindle speed, and a 128MB data cache, it achieves sustained media transfer rates up to 175MB/s. WD's proprietary AllFrame™ firmware technology reduces video frame drops, refines playback capabilities, and optimizes low bit-rate, high stream-count streams. Rated for an annual workload of up to 180TB/year and an MTBF of 1 million hours, the WD44PURZ supports up to 64 single-stream HD cameras across systems scaling up to 16 drive bays, backed by Western Digital’s 3-year limited warranty.

Key Features

• Engineered for 24/7 Surveillance Systems: Tuned specifically for continuous video capture in mainstream security DVRs and NVRs subject to persistent write operations and thermal demands.
• Exclusive WD AllFrame™ Technology: Specialized firmware algorithms help reduce frame loss, improve video streaming consistency, and ensure seamless playback.
• Conventional Magnetic Recording (CMR): Employs standard CMR technology to guarantee consistent write performance without the write penalties of SMR alternatives.
• Enhanced 180TB/Year Workload Rating: Delivers up to three times the workload capacity of standard desktop computer hard drives.
• Scalable Support for 64 HD Cameras: Optimized to handle up to 64 concurrent single-stream HD cameras, providing ample room for multi-camera array expansion.
• Multi-Bay Enclosure Scalability: Built with tarnish-resistant internal components and anti-vibration balancing to support surveillance systems with up to 16 drive bays.
• 1 Million Hours MTBF Reliability: Heavy-duty mechanical endurance providing an estimated Mean Time Between Failures of up to 1,000,000 hours.
• 3-Year Limited Manufacturer Warranty: Backed by Western Digital's comprehensive 3-year hardware warranty and technical customer support.

Product Specifications

Compatibility, Environmental and Logistics