Which is the best strategy to save the batteries of your macbook pro, to watch a movie that is stored on an usb hard drive (powered by the macbook) ?
1) Plug the usb hard drive and watch the movie from it.
2) Copy the movie on the the macbook hard drive, unplug the usb harddrive and watch the movie?
I personally think the 2) is the best, but can't say I'm sure 100%