The WD Red drive is built for single-bay to 8-bay NAS systems and packs the capacity to store your precious data in one powerhouse unit. Cooler Temperatures By reducing power consumption, the operating temperature of your NAS stays cool. With a lower temperature in your system, you can create a more reliable solution for your NAS.   Built for NAS Compatibility WD Red drives with NASware technology are purpose-built to balance performance and reliability in NAS and RAID environments. Desktop Drive vs. WD Red Drive A desktop hard drive is not typically tested and designed for NAS environments. WD Red has features such as NAS compatibility, increased reliability and more.   WD Red for Home Stream, backup, organize and effortlessly share your digital content to your TV, PC and more. NASware technology increases your drives compatibility with your NAS system, for better playback with your devices.   WD Red for Small Business Businesses thrive on productivity and efficiency, two guiding principles built into the design of the WD Red drive. Share and backup files at the speed of your business with a WD Red drive in your NAS.   WD Red for Big Business Looking for maximum performance in a heavy use NAS? The WD Red Pro drive is designed to handle an increase in workload and system demand and features a 5-year limited warranty.   Designed for NAS Desktop drives arent purpose-built for NAS. But WD Red drives with NASware 3.0 are. Our exclusive technology takes the guesswork out of selecting a drive. We can help you find the perfect storage for your NAS system.   3D Active Balance Plus Helps to ensure your data is protected from excessive vibration and noise in a NAS or RAID environment. This dual-plane balance control maintains your drive’s performance over time.   Premium Support and a 3-year Limited Warranty Confidently upgrade to the best in NAS drive performance with the assurance of a 3-year limited warranty and world-class support services included with every WD Red drive.   24/7 Reliability Since your NAS system is always on, a highly reliable drive is essential for long term reliability. Desktop drives are not designed and tested in 24x7 conditions, which is a foundation of WD Red NAS hard drives. Specification Type of Drive: NAS Series: WD Red Form Factor: 3.5\"\"\"\" Capacity: 4 TB Interface Type: SATA Interface Speed: SATA III - 6Gb/s Speed: 5400 RPM Cache: 256 MB Condition: New Dimensions: 147mm x 101.6mm x 26.1mm Package Type: OEM Package Weight: 0.4500 kg Warranty: 3 Years