Freecom Mobile Drive Mg 1TB USB 3.0/FW800 Portable External Hard Drive with Magnesium Enclosure for MacBook, Silver 97712 Ultra thin mobile hard drive in stylish design, complements the design of your MacBook Magnesium enclosure: ultra lightweight, high quality, solid and environment- friendly material Mac HFS+ formatted, immediately ready to be used on your MacBook and 100% Time Machine compatible Connects to the USB port of your MacBook No cooling fan, ensures quiet operation High quality and sleek design Green - Magnesium is an earthly matter. It is produced from sea water, brines and magnesium-bearing minerals, which offer unlimited reserves