Calling "being able to detach and reattach one cable" (assuming that the external power supply you're planning to use can actually handle the power and data tra

Calling "being able to detach and reattach one cable" (assuming that the external power supply you're planning to use can actually handle the power and data transfer job you're asking of it, so really this is a capability which just isn't going to work some-to-much of the time) a "breath of fresh air" is pretty seriously overstating things. Especially when you're going to have a hard time powering a powerful small machine... 120->240W doesn't provide a lot of grunt.