WD  320 GB Caviar Green SATA III Intellipower 32 MB Cache Bulk/OEM DESKTOP Hard Drive WD3200AZDX (Amazon Frustration-Free Packaging) 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 designed to deliver both significant power savings and solid performance. IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise, and vibration. 320 GB capacity holds up to 64,000 digital photos, 80,000 MP3 files, and up to 38 hours of HD video. 2 year limited warranty. Ships in Certified Frustration-Free Packaging