The WD 6TB Purple Surveillance Hard Drive is a specialized server drive designed for use with Network Video Recorders (NVR’s). With a storage capacity of 6TB and a rotation speed of 5400 RPM, this HDD is perfect for continuously writing and storing a large amount of data for surveillance systems. The drive features a SATA III interface, 256MB cache, and a form factor of 3.5 inches, making it compatible with various desktop configurations. With the WD Purple brand and reliable Western Digital technology, this hard drive offers high performance and durability for your storage needs.