WD - 4TB Desktop SATA Hard Drive - OEM - Black

Dual processor - Twice the processing power to maximize performance

Colossal cache - Bigger, faster cache of up to 64 MB means faster performance

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

StableTrac - The motor shaft is secured at both ends to reduce system-induced vibration and stabilize platters for accurate tracking, during read and write operations

NoTouch ramp load technology - The recording head never touches the disk media ensuring significantly less wear to the recording head and media as well as better drive protection in transit