A glass ceramics composition for recording disk substrate consists essentially, expressed in terms of weight percent on the oxide basis, of from 65 to 80 wt % of SiO2, from 3 to 15 wt % of Al2O3, from 3 to 15 wt % of Li2O, from 0. Through-holes are formed in four corners of a pan receiver, upwardly protruding pieces of a plate spring fixed to a bottom surface of the pan receiver are inserted into the through-holes, and pan receiver legs are attached to the upwardly protruding pieces. A motor is operable to rotate the rotary member so that each of the loading sections is sequentially opposed to the image carrier, and operable to exert a detent torque when no power is supplied thereto. A transmitting section reports the subband information to a base station. The system further includes means for stitching scans together, providing for smaller and less expensive optical elements. A 3-dimensional integrated circuit comprises a first chip, the first chip comprising a default voltage level and a plurality of wiring layers; and a second chip, the second chip comprising at least one repeater, the repeater being connected to the default voltage level.