The present invention is directed to a method of stimulating ciliary beat frequency to promote mucociliary or cough clearance of retained mucus secretions from the lungs, sinuses, upper airways, ears, eyes, genito-urinary tract, spermatozoa, ovaries, fallopian tubes, neutrophils, and macrophages of a patient. The outer rim is made from stamped light alloy plate, while the other parts are obtained by casting or other process. An electrically conductive base is positioned near the heating rotary. In another embodiment, the seal contains information for generating a key. A migration module dynamically migrates data of the first logical unit to a second solid-state memory, wherein the data is continuously available at an original logical address.