Medical devices implanted in a patient can be activated and powered by an RF signal. The write operation comprises: comparing input data DI with read data GO read from a memory cell array and encoding the input data DI to form write data GI by a data encoder WC; and decoding the read data GO by a data decoder RD to form output data DO. The center member and flanges preferably comprising a thermoplastic material provides a relatively hard, durable, substantially weather-resistant structure. The input includes a configuration of properties of the first and second designtime entities, and generating the runtime entities includes setting properties of the first runtime entity in accordance with the configuration of properties of the first designtime entity. When the error detecting part detects an error in the servo information, recording areas spanning from a recording area including the servo information having the error to a recording area including next servo information are replaced by other recording areas, wherein the servo error information is managed and recording area setting is restarted. A schema definition for the data element includes layout information with at least a first context value assigned thereto.