A bond adhesive composition comprising a polymer having a silicon-containing hydrolyzable terminal group and a hydrocarbon resin, where the composition is substantially devoid of phenolic resin. A pulse generation unit generates the minute vibration pulse and the driving pulses by selecting a part of the driving signal. A volume flow of at least some of the pressure fluid supplied to a respective hydrostatic pocket is variable depending upon a pressure on its respective hydrostatic support element. The seal rings include a plurality of wire bristles extending radially inwardly from the end cap wherein the wire bristles are configured to extend to a surface of the shaft when assembled and the bristles are configured to present a tortuous flow path to gas infiltrating the cavity. To recover the original data, each layer is extracted and the data restored in reverse order of the embedding.