The present invention addresses the need to improve the long-term storage stability of vector formulations. Information is recorded in the first group unit. The masking layer and the catalyst layer are etched to form a structure on the substrate, the structure comprising a portion of the catalyst layer and a portion of the masking layer disposed on the catalyst layer, with sidewalls of the catalyst layer being exposed. A portion of the sealing ring is axially retained between the retaining element and the axial end surface of the mounting end. The guide bar itself may also be thermally conductive, providing a further avenue for heat to be transferred from the portable computer to the docking station.