it's because the WD Caviar Green hard drives Reduced power consumption by up to 40%, A fine-tuned balance of spin speed, transfer rate and caching algorithms designed to deliver significant power savings Both, IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise , and vibration, 2TB capacity holds up to 400,000 digital photos, 500,000 MP3 files, and 240 hours of HD video, and Ships in Certified frustration-Free Packaging.
