G-DRIVE MOBILE WITH THUNDERBOLT $199.95, g-technology.com

This portable hard drive with brushed aluminum exterior has 1TB of storage and can transfer data at a rate of 136MB per second via Thunderbolt or USB 3.0. It measures only 5 in x 3.3 in x 0.7 in, and is compatible with Macs but can easily be reformatted for PCs. It is able to function without being plugged into AC power, and also syncs with the back-up software application Time Machine.