Enhanced reliability with 3D Active Balance(TM) Plus and error recovery prevention with NASware 3.2Extended drive testing to ensure each drive for extended reliable operationMost extensive NAS partner compatibility-testing list available5-year manufacturer limited warrantyPackage includes a hard drive only - no screws, cables, manuals included. Please purchase mounting hardware and cables separately if necessarySpecificationLearn more about the Western Digital WD4001FFSXModelBrandWDSeriesRed ProModelWD4001FFSXPackagingBare DrivePerformanceInterfaceSATA 6.0Gb/sCapacity4TBRPM7200 RPMCache64MBFeaturesFeaturesStorage for 1 to 16 bay NAS solutions - Joining the original color of NAS, WD Red Pro adds support for medium and large 1-16 bay NAS business storage systems. WD Red Pro hard drives integrate WDs exclusive technology, NASware 3.0, to provide unparalleled support for drive compatibility, reliability, and performance.Exclusive NASware 3.0 technology - Our exclusive advanced firmware technology built into every WD Red Pro drive, NASware 3.0 enables seamless integration, robust data protection and optimal performance for systems operating in the demanding NAS environment.Error Recovery Prevention - Built specifically for RAID and NAS environments, WD Red Pro drives come equipped with error recovery controls as part of NASware 3.0, which prevents the drive from fallout in RAID applications.Vibration Protection - In combination with 3D Active Balance Plus, WD Red Pro also features hardware vibration compensation technology which monitors the drive to correct both linear and rotational vibration in real time, further increasing drive reliability.UsageFor NAS systemsDimensionsForm Factor3.5"Height (maximum)26.10mmWidth (maximum)101.60mmLength (maximum)147.00mm