WD Purple™ Pro Surveillance Hard Drive 12TB WD121PURP Features: Engineered with advanced capabilities needed for high-end smart video solutions High performance, reliability and workload capability for advanced AI-enabled recorders, video analytics appliances, deep-learning servers and cloud-based storage, including RAID and JBOD configurations. Supports up to 550 TB/yr workload rate. Designed with tarnish-resistant components for harsh environments, and with additional robustness for multi-bay enclosures Specifications: Capacity 12 TB Form Factor 3.5 Inch Cache Size 256 MB Interface SATA Connector SATA Disk Speed (RPM) 7200rpm Transfer Rate up to 245MB/s Dimensions (L x W x H) 5.79" x 4" x 1.03"