Western Digital WD Passport 160GB USB 2.0 External Hard Drive with Carrying Case, Black 160 GB, 5400 RPM, 2 MB Cache Simple to set up, light and easy to carry, and requires no power adapter Rugged, shock-absorbing case protects the 2.5-inch hard drive and the data on it Power-stingy design prolongs laptop battery life Compatible with Windows and Macintosh PCs