The probability of occurrence of post-recording erasure phenomena in which recorded data is erased is reduced by adding at the end of a sector block a repetition pattern 56 of a minimum bit length for that sector block. The invention also relates to a method for mixing a liquid and pulverous solid into each other in a fluidized bed, for clarification the solution that is formed and for discharging the clarified solution from the mixing reactor. The reduction is tolerable for motion characterization as long as sufficient image resolution remains. The controller contains maps that indicate a correction coefficient corresponding to the rate of increase of the engine rotation speed. The second fixed part to which the harness is fixed and electrically connected is disposed within a battery upper surface area.