Hdd purple 10tb 3.5 sata 6gbs 256mb - western digital purple 10000gb serial ata iii internal hard drive: more cameras. more clarity. more surveillance. built for 24/7, always-on, high-definition security systems. with a supported workload rate of up to 180 tb/year and support for up to 64 cameras, wd purple drives are optimized for surveillance systems.