The Western Digital WD Purple Pro 10TB Hard Drive (WD102PURP) is a surveillance system hard drive that boasts a 7200 RPM spindle speed, 512MB cache, and SATA 6Gb/s interface for high-speed data transfer rates. It also features OptiNAND technology for improved data integrity, AllFrame AI technology for enhanced streaming performance, CMR recording technology, and tarnish-resistant components for harsh environments. With a workload rate of up to 550TB/year, this hard drive is perfect for use in demanding surveillance systems with up to 64 cameras.