WD Red is the only drive specifically designed for NAS systems with 1 to 8 bays. Extensively tested for compatibility with top NAS manufacturers. Engineered for 24/7 operation and reliability. Beyond desktop with Answered Important features for system integrators Save power and money Intelligent error recovery Command completion WD Red is the only hard drive designed for NAS systems that have 1-5 drive bays. Available in captivities ranging from 1 TB to 6 TB, WD Red is designed specifically for home and small office NAS systems. The drives are extensively tested for compatibility and reliability in the demanding operating environment of a 24x7 NAS system. WD's exclusive NASware firmware technology enables seamless integration and balanced performance. Innovative technology reduces power consumption and lowers the operating temperature, and with a 35% improvement in MTBF over desktop drives, WD Red is a more reliable and robust NAS hard drive solution.