Western Digital Caviar Green 750 GB SATA III Intellipower 64 MB Cache Bulk/OEM 3.5-Inch Internal Bare Drive Desktop Hard Drive - WD7500AARX WD Caviar 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. 3 year limited warranty.