In one embodiment, a magnetic disk drive is equipped with a mechanism that dehumidifies moisture through a passage or a moisture penetrating body that restrains the flow of water molecules within the magnetic disk drive by means of a membrane electrode assembly for electrolysis dehumidification....http://www.google.com.au/patents/US7460333?utm_source=gb-gplus-sharePatent US7460333 - Hard disk drive with humidity control using membrane electrode assembly
