The WD Red Pro 4TB NAS Hard Drive is engineered for high-performance and reliable storage in commercial and enterprise NAS systems. Designed specifically for 24x7 multi-user environments, this drive offers durability and scalability for large-scale RAID-optimized NAS setups. Featuring a rapid 7200 RPM spindle speed and a sizable 256MB cache, it delivers fast data transfer rates up to 217 MB/s with SATA 6 Gb/s interface. Incorporating Western Digital's exclusive NASware™ technology, it optimizes drive parameters to ensure maximum performance and reliability tailored for NAS workloads. Built with CMR technology for consistent data integrity, the WD Red Pro handle intensive workloads rated up to 550TB/year and provide an industry-leading 2.5 million hours MTBF. Its 3.5-inch form factor fits a wide variety of NAS enclosures and is backed by a 5-year limited warranty, ensuring your data remains secure and accessible. Ideal for creative professionals, medium to large businesses, and enterprise environments requiring dependable and high-capacity NAS storage solutions.