So I've noticed my harddrive read and write speeds are considerably slower when the laptop is running on battery. My 7200 reads and writes at 100/100 when plugged in, but only 60/20 when on battery. My Vertex 3 reads and writes at 500/500 when plugged in, but only 410/380 when on battery. Is there a setting somewhere that I can toggle to attain full speed when on battery? Thanks.