Cavalry Storage CAUM Series 320 GB USB External Hard Drive (Black) CAUM37320-B USB 2.0 (USB 1.1 backwards compatible) interface Plug and play for Windows 2000 and newer (pre-formatted to NTFS) Hard drive activity LED Unit Includes - One (1) year manufacturer's warranty, 320 GB 3.5-inch hard drive in a single bay aluminum enclosure, USB cable, stand, power adapter and Quick Start Guide System Requirements - Available USB port, Mac OS 9.x or newer, Windows 98SE / Me / 2000 / XP / Vista