The Western Digital Caviar Green WD15EADS is a 1.5 TB internal hard drive with a fast Serial ATA (SATA) interface, offering a 3 Gbps rate of transfer. This Western Digital internal hard drive also features Intellipower rotational speed technology, which balances the spin speed, transfer rate, and caching algorithms to deliver significant power savings and a solid performance. The Western Digital Caviar Green WD15EADS uses GreenPower technology to allow it to operate with lower temperatures and less power consumption, an ideal feature for energy-conscious users. This 1.5 TB internal hard drive offers users substantial storage for photos, videos, documents, and programs. The Western Digital Caviar Green WD15EADS also includes NoTouch ramp load technology. This prevents the recording head from coming into contact with disk media, which results in significantly less wear and tear to the recording head as well as better drive protection. In order to upgrade PC storage with this Western Digital internal hard drive, users will need a SATA controller, a SATA data cable, a SATA power cable, and a 3.5-inch (8.89-cm) drive bay within the device.