FireWire 1394 + USB External Enclosure for 2.5-inch IDE Hard Drive, Bus-powered (up to 320 GB tested) Slim Aluminum case which can hold 2.5-inch laptop hard drive up to 10 mm in height Large Storage Supported (up to 320 GB tested); Internal mouting plate with anti-shock design. Dual Power Interfaces: Bus-powered (USB or Firewire) and Self-powered with optional AC power adapter (ASIN: B001PUSERA) Provides both 6-pin and 4-pin Firewire IEEE 1394 ports and one USB 2.0 Hi-Speed port Works with Windows, Mac OS X and Linux