WD Green 2 TB Desktop Hard Drive: 3.5 Inch, SATA III, 64 MB Cache (WD20EARX) (Old Model) IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise, and vibration. And caching algorithms designed to deliver both significant power savings and solid performance. And offer best-in-class acoustics and operating temperature and 3rd generation SATA interface. WD Caviar Green hard drives reduce power consumption by up to 40%. IntelliPower - A fine-tuned balance of spin speed, transfer rate.