Western Digital Passport 250gb External USB Hard Drive Wd2500u017-006 Western Digital Passport USB 2.0 250GB Portable HDD General Features: USB 2.0 interface 250 GB formatted capacity Plug Play Hot-swappable Portable design BUS powered Unit Dimensions: .59 x 3.14 x 5.11-inches (H x W x D) .23 lbs Regulatory Approvals: FCC CE UL MIC BSMI C-Tick