Western Digital WDG1U4000 My Book Essential Edition 400 GB External Hard Drive USB 2.0 Store and back up your music, photos, videos and important documents with this external hard drive Easy to set up and use with built-in installation software Simple user interface features USB 2.0 connectivity Device holds up to 400 GB of data Measures 5.55 x 2.25 x 6.71 inches (WxHxD)