Designed for Mac, these sleek little portable USB drives now feature a new, smart, visual backup solution that protects your data automatically. Designed for Mac computers, these elegant portable hard drives are simple to use, light and easy to carry, and require no power adapter - they are powered directly through the USB cable. Available in 640GB, 500GB, 320GB, and 250GB. Formatted for Macintosh, this stylish portable hard drive is perfect for Mac users on the go. Use it to pack up your office files and take them home, carry thousands of songs or pictures and back up your Mac laptop using Apple Time Machine.