A memory system includes: a bit counter and a regression analyzer. In addition, a probe actuator produces relative motion between the sample and the probe, in a generally vertical direction, and a controller that generates a scanner drive signal and an actuator drive signal. Each input image is checked to see whether a reference area and a reference area background are the same. A heat-dissipating putty sheet according to the present invention is formed by applying the thus obtained thermal conductive composition onto a release sheet.