PURPOSE: To improve reliability by protecting the device by stopping the control of a device having any operational problem when the device is inclined at a certain degree without letting an operator be conscious of it.

CONSTITUTION: It is checked whether the access of a hard disk is executed or not (S1). In the case of access, this check is enabled by turning on a flag on a RAM and judging the ON. When the hard disk is accessed, control is advanced. Then, the limit time for the state of inclining the device is set (S2). Next, the inclination is confirmed again and when the inclined state is further continued (S3), the reconfirmation is continued for the set time (S4). Then, the degree of inclination and the time are grasped by using a magnetic sensor or the like for fixed time. When the inclined state is continued over the set time, the access of the hard disk is stopped, the motor of the hard disk is stopped as well and a head is also saved in a save area.