An optical disk drive having a turntable for carrying an optical disk with a clamping plate made of a magnetic material having a clamping area. The hem flange is formed by fluid pressure over a small radius tool portion to bend the flange from the sheet material and stretch the flange material below the bend to form a thinned hemline valley in the material. Homopolymeric or copolymeric polyolefins are produced by contacting olefins or olefins and alpha-olefins with the catalyst composition. The target time setting unit sets, for each of the tasks corresponding to the detected event, a target completion time of the task until when a state change generated due to occurrence of the event does not exceed a threshold, on the basis of an execution result of tasks corresponding to a past event related to the detected event. for homopolymer and about 165 for typical random copolymer. The nanoscale particles are capable of acting as an oxidant for the conversion of carbon monoxide to carbon dioxide andor as a catalyst for the conversion of carbon monoxide to carbon dioxide.