Western Digital Caviar Green WD10EARS Hard Drive - 1 TB - 5400 rpm - Serial ATA/300 - Serial ATA - 3.5" - Internal WD Caviar Green hard drives reduce power consumption by up to 40% and offer best-in-class acoustics A fine-tuned balance of spin speed (5400 RPM), transfer rate and caching algorithms designed IntelliSeek - Calculates optimum seek speeds to lower power consumption, noise, and vibration. 1 TB capacity holds up to 200,000 digital photos, 250,000 MP3 files, and 120 hours of HD video.