Western Digital Red Pro WD221KFGX 22 TB Hard Drive - 3.5" Internal - SATA (SATA/600) - Conventional Magnetic Recording (CMR) Method - Storage System Device Supported - 7200rpm Take Control of Rapidly Growing Data Built for power users and medium-sized businesses struggling to manage rapidly growing amounts of data, WD Red® Pro drives are specifically designed for NAS systems with up to 24 bays. Engineered to handle high-intensity workloads in 24x7 environments, WD Red® Pro is ideal for archiving, protecting, and sharing data with a large number of users or multiple data-hungry applications. These drives add value to your business by enabling your employees to quickly share files, back up folders, and access data quickly and reliably in your NAS system. Exclusive NASware™ 3.0 Technology Our exclusive advanced firmware technology, NASware™ 3.0, enables seamless integration, robust data protection and optimal performance for NAS systems operating under heavy demand. Built into every WD Red® Pro hard drive, NASware 3.0"s advanced technology improves storage performance by increasing compatibility, integration, upgradeability, and reliability. Built for Optimum NAS Compatibility WD Red® Pro drives with NASware™ technology take the guesswork out of selecting a drive. Optimized for NAS systems, our unique algorithm balances performance and reliability in NAS and RAID environments. Simply put, a WD Red® Pro drive is one of the most compatible drives available for NAS enclosures. But don"t take our word for it. WD Red® Pro drives are a reflection of extensive NAS partner technology engagement and compatibility-testing. Larger NAS Bay Shock Protection WD Red® Pro drives are equipped with a multi-axis shock sensor that automatically detects subtle shock events and dynamic fly height technology which adjusts each read-write function to compensate and protect the data. This combination of technology further protects the drives in larger 24-bay NAS environments and helps increase hard drive reliability.