A method, apparatus and software is disclosed for processing inputoutput requests for a mirrored storage volume in recovery mode in which the processing of normal IO is optimised using the recovery map for the volume. ODS groups are chemically bonded to a silica gel having a specific surface area of 200 to 300 m2g, which is then subjected once or twice to end capping including high temperature end capping so as to efficiently remove or deactivate active silanol groups. This game machine uses a predetermined evaluation means to detect whether a ball hit by a player using a bat has hit the target, and displays an evaluation result on an on-base status display section and a numerical value display section.