The WD 2TB WD Caviar Green 3.5" SATA Internal Hard Drive is designed for use in systems that require cool and quiet operation. It can be used as a secondary drive in PCs, for external enclosures and other applications that require cool and quiet operation. Furthermore, these drives are eco-friendly and energy efficient. With a 2TB storage capacity, SATA interface and transfer speeds up to 6 Gbps, it is ideal for demanding applications that require high performance. The Caviar Green uses NoTouch Ramp Load technology, which prevents the recording heads from resting on the disk during spin up, spin down and when the drive is off. This results in a more reliable drive due to the limited head wear. The Caviar Green has also been tested rigorously to ensure compatibility with most systems.