Mfr Part Number: WDG1U5000N Product Features: Easy to set up, easy to use: This drive is all about simplicity. Plug it into your computers USB 2.0 port and start saving. Intelligent drive management features: The My Book drive turns itself on and off with your computer. Smart design: The elegant case, iconic of a book, takes up less space on your desk, stacks horizontally, and allows two or more drives to stand neatly together like volumes on a shelf. High quality hard drive: Inside the case is an exceptionally fast, ultra quiet, cool-running hard drive from Western Digital. Capacity: 500 GB Rotational Speed: 7,200 rpm Cache: 16 MB Interface: USB 2.0 Serial Bus Transfer Rate: 480 Mbits/s (Max) Seek Time: Read: 8.9 ms Track-To-Track: 2.0 ms Dimension (WxLxH): 2.25 x 5.550 x 6.710 inch / 57.2 x 141 x 170.5 mm Weight: 2.90 lbs. / 1.32 kg