A dynamic random access memory with two divided memory banks is disclosed wherein memory cells are divided into first and second groups each of which includes an array of memory cells connected to a corresponding word line. The slidable member is slid in the carriage movement direction to switch a height position of the carriage with respect to the guide member, whereby a gap between the recording head and the recording material is switched. The pressure adjustment assembly includes a pressure adjuster device configured to movably cooperate between the rotor element and the valve housing to adjustably generate an axial compression pressure at the rotor-stator interface at a calibrated operating pressure, PC.