An ultraviolet detectorindicator comprises of a column, hemisphere, cake, or wire where a light receiving front and a light emitting front are respectively installed on the two ends with connections, and a light guide unit, which contains the material that strengthens the ultraviolet or adjusts the spectrum is installed between the two fronts. Brightness level data of the input image is filtered to obtain at least a low frequency component and a high frequency component. When there is a failure, a valve body of the pilot valve is retracted to abut against a fail-safe disk by spring force of a valve spring. For the target storage pools, source storage disks to be moved into the target storage pools are determined from other storage pools than the target storage pools in the storage system. 32 nm; a voltage application unit that applies a voltage to the recording layer, produces a phase change in the recording layer, and records information; an electrode layer that applies a voltage to the recording layer; and an orientation control layer provided between the recording layer and the electrode layer to control an orientation of the recording layer.