The present disclosure is directed toward a downhole tool used to free stuck tools in a wellbore and the method of using the downhole tool. The leg-protection device includes an airbag to be inflated upwardly along a bottom surface of a steering-column cover and a projecting member provided at the airbag and projecting from a front end portion of the airbag in a inflating direction when the airbag is inflated. Additionally, methods and apparatus are provided to permit high bandwidth sensing of transient supply currents as need to preserve the narrow widths of these current pulses. The primary articulation occurs between the radius portion and the carpal ball. Power consumption in the datacenter may be optimized by selectively reducing power to data storage devices to which less-active data, such as persistent data, has been moved.