USB 2.0 Enclosure with Dual Power Design for 2.5-inch IDE Hard Drive up to 320 GB Suitable for all types of 2.5-inch IDE hard drives (height less than 13 mm) Chipset: Prolific PL2506; supports up to 320+ GB drives Dual power interfaces + power switch: Bus-powered using included USB double cable; Self-powered using optional power supply (ASIN: B001PUSERA) Windows 98/2000/ME/XP/2003/Vista, Mac OS X and Linux compatible Dimension: 125 X 79 X 19 mm