The Western Digital Caviar is a 2 TB external hard drive that is well-suited for systems that require cool and silent operation. It has a 3.5-inch form factor. This device with its storage capacity of 2 TB lets you store ample digital content, flies, games, movies and music with ease. With its 2400 Mbps I/O transfer rate, the hard drive is a good option for those seeking quick file transfers.