Let the hive mind of Engadget get that for you.
"I finally got a new laptop with a lone USB 3.0 port. I'm now looking at getting a USB 3.0 hub with a power adapter so I can use both of my USB 3.0 hard drives at faster speeds. I've read lots of horror stories where some hubs either don't come with power adapters -- and as a consequence the portable drives don't work with them properly -- or they are designed poorly which results in USB 2.0 speeds. Or, the hard drives keep getting disconnected. Do your readers have any suggestions or experience using USB 3.0 hubs? Thanks!"
To #1, please mind your physics, it is the second law you are talking about. Any process will create entropy on the system, in other words: you need a dump for the heat you will generate with the compressor and evaporator.
So to put it in proper terms:
This will take the heat away SOMEWHERE else (as in an increment on the room's temperature)
:) Don't mind my spanglish!