A disk control apparatus includes a shock sensor detecting a shock applied to a disk portion performing data reading and writing on a hard disk, and a shock log data generation manager creating shock log data concerning the detected shock, based on a predetermined shock determination threshold value relating to the level of the shock. The mixture is subjected to temperatures in the range of from about 60\xb0 C. The set of seed search queries andor seed URLs are used to identify URLs containing content relevant to the subject area.