A magnetoresistive device comprising a magnetoresistive unit, an upper shield layer and a lower shield layer stacked such that the magnetoresistive unit is held between them. The first server has a server partition and a management processor which is separate from said server partition. Neither the housing base nor the sub-floor component alone is configured to operate as a waveguide. The semiconductor switch has a first terminal which is connected to the incandescent lamp, and a second terminal which is connected to a reference potential.