The CAUM Series external hard drive delivers reliable storage expansion and the incredible transfer speed of USB 2.0, all in one sleek aluminum package. The external hard drives solid aluminum enclosure boasts exceptional heat dissipation for near-silent, fan-less operation. The CAUM is remarkably durable, offering state-of-the art shock absorption and superior all-around performance, and its stackable design gives you a streamlined, uncluttered workplace.