Capacity: 4TB,Form Factor: 3.5-Inch,Connector/Interface: SATA,Transfer Rate: Up to 180MB/s,Disk Speed: 5400 RPM,Recording Technology: CMR,Cache Size: 256MB,Endurance (TBW): N/A,Dimensions: 5.787 x 4 x 1.028,Weight: 570g,Model Number: WD40EFPX,Operating Temperature: 0C to 65C,Non-Operating Temperature: -40C to 70C,Features: Ideal for home offices, power users, small to medium businesses, and consumer/commercial NAS systems, for RAID-optimized NAS systems with up to 8 bays, rated for 180TB/year workload and 1M hours MTBF,Compatibility: RAID-optimized NAS systems with up to 8 bays.