WD  Caviar Green 2 TB SATA Internal Hard Drive Retail Kit - WD20000CSRTL Massive capacity - Capacities up to 2 TB offer the most available capacity for storage-intensive programs and space-hungry operating systems, like Window Vista, with plenty of room left over for photos, music, and video. Reduced power consumption - WD has reduced power consumption by up to 40 percent compared to standard desktop drives with the combination of WD's IntelliSeek, NoTouch, and IntelliPower technologies. Hepls enable eco-friendly PCs, Caviar Green drives yield an average drive power savings of 4-5 watts over standard desktop drives making it possible to build systems with higher capacities and the right balance of performance, reliability and conservation Cool and quiet - GreenPower technology yields lower operating temperatures for increased reliability and low acoustics for ultra-quiet PCs and external drives. IntelliPower - A fine-tuned balance of spin speed, transfer rate and caching algorithms designed to deliver both significant power savings and solid performance.