The present invention relates generally to the storage andor retrieval of information on magnetic storage media by using one or more novel approaches alone or in combination. In the process a magnetic alternating field is generated which is influenced by a change of position of the electrically conductive element. The effect of the fiber fuse is to consume the core 2 along the whole length of the fiber or to consume periodically spaced lengths of core 2 along the whole length of the fiber. One shut-off unit each is arranged in the fluid-conducting connection at least between the first heat-dissipating part and the cooler and between the pump and the first heat-dissipating part.