Buffalo  JustStore Portable 500 GB USB 2.0 Ultra-Slim Portable External Hard Drive HD-PV500U2/BK (Black) Easily store and transport your photos, music, videos, documents and other data files Includes Buffalo's TurboUSB utility that increases Windows transfer speeds by up to 20% over competing USB 2.0 portable hard drives Ultra-Slim design is lightweight and easily fits in your pocket Plug-and-play storage expansion for both Windows and Mac computers USB powered No AC power adapter needed