Western Digital 1.5 TB Caviar Green SATA Intellipower 32 MB Cache Bulk/OEM Desktop Hard Drive WD15EADS WD Caviar Green hard drives reduce power consumption by up to 40% A fine-tuned balance of spin speed, transfer rate and caching algorithms designed to deliver both significant power savings. IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise, and vibration. 1.5 TB capacity holds up to 300,000 digital photos, 375,000 MP3 files, and 180 hours of HD video.