The invention relates to a new VRLA battery float model. A storage media supporting device removably supporting at least one storage medium is removably attached to the information processing apparatus. The manual repetition system has an MRS frame mountable to the screen frame, a track system, and a height adjustor configured to adjust the height of the track system relative to the MRS frame. This strip is tensioned when the cover is unwound from the spool and a locking mechanism retains the cover in a desired unwound position against the tension of the rubber strip. It is an object of the invention to propose a method for compensating an offset in an asymmetric reproduction signal DRSO capable of compensating the offset even if the amplitude of the shortest run-length components is smaller than the asymmetry of the reproduction signal DRSO. That is, processing center, which takes the form of a local desktop computer, is responsive to the measurement signals and the reference signals for deriving the survey data.