Western Digital WDMEB5000TN My Passport Essential 500GB USB Hard Drive - Blue Box Contents - My Passport Essential 500GB Portable USB Hard Drive, USB 2.0 cable, Quick Install guide 500GB Hard Drive Capacity Just plug it in and it's ready to use. There is no CD to install; the included software loads from the drive the first time you plug it in Powered by the USB bus. No separate power supply is needed This ultra-portable drive fits easily in your pocket or purse, weighs only a few ounces, and holds tons of valuable data