Desktop Hard DrivesWD Green hard drives are designed for use in systems that require cool and quiet operation in PCs, or for external enclosures and other applications for which low noise and low heat are beneficial. These reliable hard drives are ideal for use whenever energy efficiency, lower power consumption and massive capacity are needed. WD Green hard drives reduce power consumption by up to 40% and offer best-in-class acoustics and operating temperature and 3rd generation SATA interface. 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. 4 TB capacity holds up to 800,000 digital photos, 1,000,000 MP3 files, and 300 hours of HD video. 2 year limited warranty. Package includes a hard drive only - no screws, cables, manuals included. Please purchase mounting hardware and cable