Product Detail WD Caviar Green hard drives reduce power consumption by up to 40% and offer best-in-class acoustics and operating temperature. IntelliPower - A fine-tuned balance of spin speed, transfer rate and caching algorithms IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise, and vibration. 640 GB capacity holds up to 128,000 digital photos, 160,000 MP3 files, and up to 77 hours of HD video. 3 year limited warranty. . The "Western Digital 640 GB Caviar Green SATA Intellipower 64 MB Cache Bulk/OEM Desktop Hard Drive WD6400AARS" is best product for you. We recommended Western Digital 640 GB Caviar Green SATA Intellipower 64 MB Cache Bulk/OEM Desktop Hard Drive WD6400AARS