A method, system, and computer program product for restoring blocks of data stored at a corrupted data site using two or more mirror sites. At that time, the back surface of the semiconductor device 10 is brought into contact with contact areas, and a first opening portion OP is opened larger than an arranging area of the semiconductor device 10. The light is generated by specific gas mixture multiple flashlamps that allow simultaneous, overlap, or consecutive firing with quasi-logarithmic spacing between pulses. When set to the reproduction mode, the thumbnail images stored in the buffer memory are read and displayed on a screen in a list format. The operator control panel also has an keypad for inputting of data, the data being shown in an input panel on the display panel.