Western Digital Purple Pro 22TB 3.5" Surveillance Internal Hard Drive

The Western Digital WD221PURP is a 3.5-inch internal hard drive that provides 22TB of surveillance-grade storage for modern video security systems. Built on the proven Purple Pro platform, it gives installers and system integrators a reliable way to keep continuous footage and analytical data in one place.

Through a SATA interface the drive moves data at up to 265MB per second, so high-resolution streams are written quickly and retrieved without delay. A 512MB cache helps smooth large bursts of activity, and OptiNAND technology balances capacity with performance, which is valuable when deep learning applications need rapid access to archived clips.

Surveillance workloads keep running long after office hours, and this model is prepared for that reality. It carries a workload rating of up to 550TB per year and is tuned to manage as many as 64 single-stream HD cameras at the same time. That balance of throughput and camera support makes it a practical choice for multi-bay network video recorders, AI-enabled recorders, and back-end analytics servers.

Reliability features include a mean time between failures of up to 2.5 million hours and components that resist tarnish in challenging environments. These safeguards allow the drive to operate around the clock in temperature-controlled server rooms, compact edge devices, or large enterprise arrays where downtime is not an option.

Security teams, small business owners, and data scientists who rely on video for evidence or insight will appreciate the blend of capacity and endurance. Whether you are expanding an existing rack-mount NVR or building a fresh AI training server, the WD221PURP installs easily, delivers predictable performance, and leaves ample headroom for future camera additions.

• 22TB capacity in a standard 3.5-inch form factor
• SATA interface with transfer rates up to 265MB/s
• Workload rating up to 550TB per year
• Supports up to 64 single-stream HD cameras
• 512MB cache for smooth data handling
• OptiNAND technology for enhanced capacity and efficiency
• MTBF up to 2.5 million hours for round-the-clock reliability
• Tarnish-resistant components for added durability
• Ideal for AI-enabled recorders, video analytics servers, and large NVR installations