Embodiments of the present invention relate to retracting a magnetic head of a disk drive device to a retract position in accordance with a fall state, and to suppressing the performance degradation due to erroneous fall determinations as well as occurrence of damage by a head-disk crash. The device may comprise a mouthpiece that may be inserted to the wall of the container. The kernel online patching implementation has a small impact on the normal operation of the operating system.