The evolution of surveillance.WD Purple Surveillance Storage is built for 24/7, always-on, high-definition surveillance security systems that use up to eight hard drives and up to 32 cameras. Features: Reduces video frame loss with surveillance-class storage Specifically tuned for surveillance security systems 3-year limited warranty (worldwide) Caching algorithms are tuned for write-intensive, low bit rate, high stream count applications that are typical of surveillance applications Supports up to eight drives Description : Interface SATA 6 Gb/s Rotational Speed IntelliPower * Buffer Size 64 MB Buffer To Host (Serial ATA) 6 Gb/s (Max) Capacity2 TB