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.