A method, apparatus, and computer usable code to manage data requests in a file system. It uses the axial section of the top wall of the main body to further press and limit the pressing member and enhance the engagement between the first teeth portion and the second teeth portion to prevent the second teeth portion from being damaged and increase its life time. Step ratios of the eight forward speeds can harmonized so as to gradually decrease from the lower gear to the higher gear, thus shift-feel is be enhanced. The front fender side vertical wall is secured at a lower end thereof to the front wheel apron. In some cases the list of capable end-user devices may be sorted andor filtered prior to selecting an end-user device from the list.