A method and system for creating and managing Virtual Population mutual relationships is disclosed. Coded data at respective stages in a certain block are extracted by the extracting means, and entropy-decoded by the entropy-decoding means, to obtain coefficient data at the respective stages in the block. The system is also programmed so users are only allowed to access sites a limited number of times. When the AC power supply does not fail, the first drive output signal sent from the electric actuator is selected; when the AC power supply fails, the second drive output signal generated by the motor drive circuit is selected and is sent to the AC motor of the electric actuator, via the relay connector. When applied to the surface of a platter, the compound sufficiently disrupts or corrupts the platter such that not recovering the information previously stored on the platter is not possible using known data recovery techniques.