WD Gold 4TB Datacenter Hard Disk Drive - 7200 RPM Class SATA 6 Gb/s 128MB Cache 3.5 Inch - WD4002FYYZ

WD Gold hard drives feature advanced technology that delivers industry leading reliability, capacity, power efficiency and performance. Full range of near line capacities - From boot servers to high end enterprise storage systems, WD Gold hard drives offer the capacities required for the most demanding datacenter environments. Highest workload capability - Delivering both performance and reliability to any datacenter environment, WD Gold hard drives are designed to handle up to 550TB per year which is the highest workload capability of any 3.5-inch hard drive. Highest level of reliability - With up to 2.5 million hours MTBF. Vibration Protection - Enhanced RAFF technology includes sophisticated electronics to monitor the drive and correct both linear and rotational vibration in real time. The result is a significant performance improvement in high vibration environments over other desktop hard drives. RAID-specific, time-limited error recovery (TLER) - Prevents drive fallout caused by the extended hard drive error-recovery processes common to desktop drives. Extended thermal burn-in test - Each drive is put through extended burn-in testing with thermal cycling to ensure reliable operation. Dynamic fly height technology - Each read-write head's fly height is adjusted in real time for optimum reliability. Dual actuator technology - A head positioning system with two actuators that improves positional accuracy over the data track(s). The primary actuator provides coarse displacement using conventional electromagnetic actuator principles. The secondary actuator uses piezoelectric motion to fine tune the head positioning to a higher degree of accuracy. Premium support Dedicated 24x7 over the phone support is included with every WD Gold hard drive.