The data management method applies to a multilevel nonvolatile memory device having a memory array formed by a plurality of memory cells. Such a golf ball is constituted of a core and a cover and the cover has a loss tangent of 0. A representative line is obtained, or selected, from each image providing a reference representative line and a test representative line. The ribs are within the substrate, and have rounded corners. Based on the ending point of the input and for example the starting point or an object position, a moving direction of the object is determined.