A procedure is introduced to diagnose a catalytic converter system with at least two catalytic converters, through which separate exhaust gas flows flow, with the steps: test if oxygen storage capacities of the catalytic converters, which are at least two in number, exceed a predetermined threshold value. The method includes receiving a request to change the configuration of the keyboard from a first configuration to a second configuration. The connector includes a plurality of pins configured to be removably connected to a first storage device and to a second storage device. Additionally, the method includes controlling display of the object in response to a modification condition being met, such that the object is displayed as rotating and the axis around which it rotates changes at least once prior to the object stopping and such that after stopping, the selected modifier of the plurality of modifiers which is to be applied is apparent from the display. The present invention also relates to a magnetic recording and reproducing apparatus using the perpendicular magnetic recording medium.