A method of managing data contained in a file includes extracting locality information contained in a printing data file; determining whether the same locality information exists between the extracted locality information and input locality information; and analyzing printing data contained in the printing data file if it is determined that the same locality information exists. Power means is provided for turning both steering rudders in the same direction for increased steering thrust. Aspect ratio dependent, as opposed to trench diameter or trench depth dependent, trench capacitors formed by a dense array of high aspect ratio trenches with thin, high permittivity dielectric increase capacitance per unit area and volume, resulting in thin, high capacitance trench capacitors having thickness equal to or less than chip thickness.