Buffalo  MiniStation Stealth 320 GB USB 2.0 Portable External Hard Drive HD-PCT320U2/B (Black) Super-slim, lightweight design saves space for ultimate portability Turbo PC increases file transfer rates by up to 2X over competing USB 2.0 portable hard drives Preformatted hard drive is ready for immediate use with Windows and Mac Perfect companion for your laptop or notebook - no extrnal power needed ECO Manager conserves energy and battery power