WD Purple 4TB 3.5" SATA III Surveillance Hard Drive (WD40PURX)

WD Purple 4TB 3.5" SATA III Surveillance Hard Drive

The WD Purple is purpose-engineered for 24/7 continuous operation in HD security and surveillance systems. Designed to handle the unique demands of always-on video recording, the WD Purple supports systems with up to 8 hard drives and up to 32 cameras simultaneously — making it the ideal storage foundation for DVR and NVR installations in homes, small businesses, and commercial security deployments.

Unlike standard desktop drives that aren't optimized for continuous write workloads, the WD Purple uses IntelliPower™ technology to balance performance and power consumption for sustained surveillance recording. Advanced Format technology improves storage efficiency and error correction, while S.M.A.R.T. support enables health monitoring. With 4TB of capacity and a 64MB cache buffer on a SATA III (6 Gb/s) interface, it provides ample storage for weeks of continuous HD footage. Backed by a 3-year warranty.

Key Features

• 24/7 Surveillance Optimized — Engineered for continuous write workloads in security systems
• Up to 32 Camera Support — Handles simultaneous streams from large multi-camera installations
• Up to 8-Drive System Support — Scales with growing surveillance infrastructure
• IntelliPower™ Technology — Balances performance and power for sustained 24/7 operation
• Advanced Format — Improved storage efficiency and error correction
• S.M.A.R.T. Support — Real-time drive health monitoring
• 3-Year Warranty — WD's surveillance-grade coverage

Technical Specifications

• Capacity: 4TB
• Interface: SATA III (SATA/600)
• Form Factor: 3.5"
• Cache Buffer: 64MB
• Max External Transfer Rate: 6,144 MB/s (48 Gbit/s)
• Weight: 1.50 lb
• Dimensions: 5.8" x 4" x 1"
• Part Number: WD40PURX
• Platform: PC, Mac
• OS Support: Windows 7, Windows 8
• Warranty: 3 Years
• Device Support: DVR, NVR, Storage System, Security System