As hard drive capacities increase, the power required to run those drives increases as well. WD Caviar GP makes it possible for energy-conscious customers to build systems with higher capacities and the right balance of system performance, ensured reliability, and energy conservation. WD Caviar Green WD10EACS - Hard drive - 1 TB - internal - 3.5" - SATA-300 - 7200 rpm - buffer: 16 MB