WD Caviar Green 2TB SATA 6 Gb/s, 64MB Cache Power-saving 3.5-inch Internal Desktop Hard Drive. Massive capacity WD Caviar GreenSATA drives now deliver up to 3 TBs of storage ona single drive. Reduced power consumption WD has reduced power consumption making it possible for our energy-conscious customers to build systemswith higher capacities and the right balance of system performance, ensured reliability, and energyconservation. Cool and quiet Drives with WD GreenPower technology yield lower operating temperatures for increased reliability and low acoustics forultra-quiet PCs and external drives. IntelliPower A fine-tuned balance of spin speed, transfer rate and caching algorithms designed to deliver bothsignificant power savings and solid performance.Additionally, WD Caviar Green drive consume less current during startup allowing lower peak loads onsystems as they are booted.