Abstract: A memory card includes a base sheet formed with a circular opening to accommodate a circular memory disc, and a lateral opening to accommodate a movable window assembly; a circular memory disc rotatably mounted within the circular opening; and a movable window assembly within the lateral opening of the base sheet and covered by cover sheets. The movable window assembly includes a plastic film carried by a carrier member and movable either to a protective position wherein the plastic film covers a window opening in the cover sheets, or to an exposing position laterally of the window opening wherein the plastic film exposes the Read section of the circular memory disc to the Read head of the reader.