Western Digital Purple 1TB 5400RPM Surveillance Internal Hard Drive

The Western Digital Purple 1TB Internal Hard Drive (model WD11PURZ) is purpose-built for video surveillance environments where reliable, continuous operation is non-negotiable. Unlike general-purpose desktop drives designed for intermittent workloads, the WD Purple series is engineered to handle the demands of always-on DVR and NVR systems, tolerating the elevated heat fluctuations and persistent vibrations common in multi-camera security installations. At the heart of the WD Purple 1TB is AllFrame technology — a firmware-level enhancement to ATA streaming that actively works to reduce dropped frames and maintain smooth video playback across a wide range of surveillance solutions. This is a meaningful advantage in environments where recording integrity is critical, whether for home security or commercial monitoring. The drive supports connections to up to 64 single-stream HD cameras simultaneously, and is compatible with up to 16 drive bays within a single enclosure, giving installers considerable room to scale their surveillance infrastructure without swapping out storage hardware. Its workload rating of up to 180TB per year — reported to be significantly higher than that of standard desktop drives — reflects its suitability for high-throughput, round-the-clock recording scenarios. Recording is handled via CMR (Conventional Magnetic Recording) technology, which is well-suited to the sequential write patterns that characterise video surveillance data, offering consistent performance and long-term reliability. The SATA 6 Gb/s interface ensures compatibility with a broad range of modern NVR and DVR chipsets, while the 64MB cache helps buffer data during high-demand multi-stream recording sessions. Data transfer speeds reach up to 110MB/s, adequate for high-definition surveillance streams. The drive is RoHS compliant and backed by a 3-year limited warranty from Western Digital. Verifiable Specifications: - Model: WD11PURZ - Capacity: 1TB - Form Factor: 3.5-inch - Interface: SATA 6 Gb/s - Cache: 64MB - Rotational Speed: 5400 RPM - Recording Technology: CMR - Max Transfer Rate: up to 110MB/s - Load/Unload Cycles: 300,000 - Operating Temperature: 0°C to 65°C - Non-Operating Temperature: -40°C to 70°C - Dimensions (L × W × H): 147mm × 101.6mm × 26.1mm - Weight: 0.45 kg - Camera Support: Up to 64 HD cameras - Drive Bay Support: Up to 16 drive bays - Advanced Format (AF): Yes - RoHS Compliant: Yes - Warranty: 3-year limited