A sensor detects one or more hazardous materials, such as by measuring the concentration of one or more hazardous gasses. Access rights with different degrees of priority to the applications are allocated to the individual operator consoles. The wheat might additionally have reduced levels of SBEIIb activity. The housing contains the motor that drives blades to shred the material in the receptacle. Information amounts of the respective reproduced signals continuously transmitted from the head to the buffer memory are decided on the basis of a given relation among parameters including intra-layer seek times and inter-layer seek times related to the head, and the first, second, and third transfer rates.