GUH1 Starlight Silver / Titanium Gray 500GB/750GB/1TB/2TB/4TB Dimensions: 115×80×17.5mm Weight: Approx. 150g (single disk) / 200g (dual disk) Interface: USB 3.0 Transfer Speed: Approx. 110MB/s Capacity: 500GB / 750GB / 1TB (single/dual disk) / 2TB (single/dual disk) / 4TB Features: Built-in smart chip, smart cache management, high-speed large file transfer