WD Purple Surveillance Hard Drive 8TB WD84PURZ Built for 24/7, always-on, high-definition security systems. With a supported workload rate of up to 180 TB/yr1 and support for up to 64 cameras, WD Purple drives are optimized for surveillance systems. WD Purple 8TB, 10TB, 12TB, 14TB & 18TB drives are designed to support Deep Learning analytics in AI capable NVRs, and feature an enhanced workload rating of up to 360TB/yr Specifications: Capacity 8 TB Host to/from drive 194 MB/s Cache Size 128 MB Interface SATA Form Factor 3.5 Inch Disk Speed (RPM) 5640rpm Compatibility WD Purpleâ„¢ surveillance storage is built to handle up to 64 cameras per drive and is designed for 24/7, always on, high-definition surveillance security systems with more than eight bays. Dimensions (L x W x H) 5.79" x 4" x 1.03"