Optimize your surveillance storage with the WD Purple Pro 18TB SATA Hard Drive. Designed specifically for 24/7 security systems, this 3.5" HDD delivers reliable performance at 7200RPM and fast data transfer with SATA 6Gb/s. Its large 512MB cache ensures smooth video streaming and quick access to recordings. Backed by a 5-year warranty, it offers enduring durability and peace of mind for your surveillance needs.