An information recording medium of the present invention is an information recording medium that allows information to be recorded thereon by being irradiated with an optical beam or by being applied with electrical energy, and includes at least a recording layer whose phase can change. The disk control unit executes commands having target data hit on the cache memory independently of the order of receipt of plural commands from the central processing unit, in parallel with the staging of target data of commands resulting in cache misses from a disk unit to the cache memory. When closed, the bottom may have a gusset for allowing expansion upon the depositing of the pot into the sleeve. The shooter can thus practice different shooting stances, muscle control, and breathing techniques, and use the feedback from the gun shake sensor to evaluate and adjust these parameters. The burner panel includes elevations that can be shaped into log structures to provide a realistic fire within a fireplace unit, stove, or insert.