Western Digital Red Pro 4TB WD4001FFSX 7200RPM 64MB SATA III 3.5" Nasware 3.0

Enhanced Accuracy for NAS - for overall enhanced accuracy, WD Red Pro is equipped with dual actuator technology which improves positional accuracy over the data tracks and head positioning. StableTrac technology then secures the motor shaft at both ends to reduce system-induced vibration and stabilise the drive platters for accurate tracking during read and write operations 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 NAS Compatibility - since your NAS system is always on, a highly reliable drive is essential. With a 35% MTBF improvement over standard drives, the WD Red PRO drive with NASware 3.0 is designed for the 24x7 always on environment