An indicator position detecting device and method are provided, which allow accurate position detection without the influence of noise in detection of the position of an indicator by a capacitive coupling system. The Al2O3\u2014TiC based substrate for a thin-film magnetic head including an Al2O3 phase and a TiC phase, wherein a c-axis lattice constant of the Al2O3 phase is 12. A communication restricting state for each service type is confirmed and the communication restricting state is confirmed on the basis of a speed threshold value, based on a result of which confirmation, communication restriction is performed. The third recording layer is capable of storing third data in compliance with second specifications different from the first specifications.