Embodiments relate to lubricants disposed over magnetic storage media, such as rotatable thin film magnetic discs. In this electrical switch, the occurrence of vibrations with the introduction onto an opposing contact is prevented. The method comprises the steps of determining the pressure in the vacuum accumulator; determining the ambient pressure; adapting a pump control signal to the ambient pressure; comparing the pressure in the vacuum accumulator with an adapted pump control signal; and outputting a pump actuation signal that is a function of the comparison.