Cavalry Storage EN-CAHDD Series USB Dual-Bay 3.5-Inch and 2.5-Inch 2-Bay SATA Hard Drive External Dock EN-CAHDD2B-ZB- Drives Not Included Hot-swappable bays with open design for easy access and excellent heat dissipation Use the two-bay like a tape drive - remove full hard drives easily and replace with any SATA drive (2.5-inch or 3.5-inch) Configurable to JBOD and BIG (Spanning) Unit Includes - One (1) year manufacturer's warranty, dual bay hard drive dock for 2.5-inch and 3.5-inch drives in any combination, USB cable and power adapter System Requirements - Available USB port, Mac OS 9.x or newer, Windows 98SE / Me / 2000 / XP / Vista