A method of reallocating data among physical disks corresponding to a logical disk is provided. Depth images recorded by the optoelectronic sensor respectively contain pixels corresponding to points of a plurality of recorded objects in the monitoring region, with position co-ordinates of the corresponding object points, and the video images recorded by the video system comprise the pixels and the data detected by the video system. The components are independent and integrated containing all the necessary processes and inputs and outputs to function independently. The acoustic sensor can be configured to receive sound generated by the mobile phone and to convert the sound into an acoustic signal. The system monitors the selected channels and provides viewership data with respect thereto.