Western Digital WDXMS1600TN Passport portable 160 GB USB2.0 External Hard Drive

High-performance portable storage for your Mac® and PC. Light and rugged, it’s easy to carry and no external power adapter is needed. Comes with sync & encryption and Google™ software.
Pack up your office files and take them home. Carry thousands of songs or pictures. These drives are simple to use, light and easy to carry, and require no power adapter--they are powered directly through the USB cable