Don't you mean "power using" mode? As in it uses more power than if you truly power it down? I think the XBox term is actually "Instant On". Power Saving mode is a near true shutdown, but takes longer to boot up. I know it's still a relatively small amount, but I'm old-school and like to truly power down devices I am not using. And I still view these OSs as needing to be restarted to keep from getting corrupted.