I'll be purchasing a USB Device for use with a Logitech Revue Google TV in a few days time. Is there anything specific, in terms of specifications, that I need to take into account when shopping? I've never used nor purchased a USB device before.Should it be USB Flash or something else? Do I look for USB 2.0 or 3.0 or higher? Terabytes - Can a terabyte hold the entire printed content of the Library of Congress? I don't think I need something with that capacity.