Western Digital WD181PURP-Dup 18TB 7200RPM 512MB Cache SATA 6.0Gb/s 3.5" internal hard drive

18 TB Purple Pro Surveillance Drive

This 18 TB 3.5-inch internal hard drive uses a SATA 6.0 Gb/s interface, spins at 7200 RPM and carries a 512 MB cache. It is engineered for always-on AI-enabled recorders, video analytics appliances, deep-learning servers and cloud-based storage that demand high capacity and sustained write performance.

Suits multi-bay AI video systems.

The drive supports up to 32 AI streams per drive for deep-learning analytics and is built with tarnish-resistant components for harsh environments and operational vibration in larger enclosures. Buyers who need storage for only a few cameras or who require a different interface should look at other options.

550 TB yearly workload with 32 AI streams

A 550 TB per year workload rating provides headroom for continuous high-bitrate recording and analytics across many channels. The 32-stream AI limit defines where deep-learning analytics capacity runs out, while the single SATA link sets the maximum sequential throughput ceiling.