Cavalry Storage CAXR Series 160 GB USB/eSATA Portable Hard Drive CAXR25160 Portable! Powered with only the USB bus so no separate power supply is needed, and, since it is so light and compact, you can fit it easily in your pocket or purse. Plug and play for Windows 2000 and newer (pre-formatted to NTFS) USB 2.0 (USB 1.1 backwards compatible) and eSATA interface Unit Includes - One (1) year manufacturer's warranty, 160 GB 2.5-inch hard drive in a single bay enclosure, black leather protective carrying case, USB cable, eSATA cable, Quick Start Guide and Resources CD System Requirements - Available USB port, eSATA port to take advantage of eSATA interface, Mac OS 9.x or newer, Windows 98SE / Me / 2000 / XP / Vista