A recording medium is provided recorded with a plurality of digital data and a plurality of reproduction path information defining a reproduction order of the plurality of digital data. The rigid circuit board is enclosed within the housing and has a main surface for supporting an electronic component. Infrequently accessed data andor sequentially accessed data may be stored within the higher-latency storage tier. Moreover, the signal blocking member is configured to move within the enclosure based at least on an amount of ink disposed within the ink chamber, and the signal blocking member is sandwiched between the at least one pair of wall surfaces.