Western Digital 250GB Passport 2.5-inch External Hard Drive - Black 250 GB USB 2.0 2.5-inch external hard drive ideal storage solution for Mac or PC USB connection; requires no external power source;128-bit encryption for data security Included Google software for searching and managing files Features glossy black design Measures a 0.59 x 5.1 x 3.14 inches (HxLxW); weighs less than 4 ounces