Disk drive device and control method of unloading corresponding to fall detection in disk drive device

A disk drive device comprising:

• a disk;
• a head configured to access the disk;
• a moving mechanism configured to support the head and move the head along the radial direction of the disk;
• a sensor configured to detect a fall;
• and
• a controller configured to control the moving mechanism according to outputs of the sensor, wherein
• the controller is configured to check whether or not detection result data of the fall sensor indicates a fall on a predetermined occasion in command processing, and, if a fall is recognized, the controller is configured to unload the head by controlling the moving mechanism;
• issue a fake error on an occasion in the command processing;
• start an error recovery process for the fake error;
• and conduct the check on the predetermined occasion in the error recovery process, and, if a fall is recognized, the controller is configured to unload the head by controlling the moving mechanism.