An apparatus and method for a power-efficient framework to maintain data synchronization of a mobile personal computer are described. 16, where \u03bb is a wavelength of a light beam and N is an index of refraction of a substrate, and that the distance Ls between the groove edge and the pit closest thereto satisfies Ls>1. One or both of the metal oxide layers may be replaced by a confining current pathway structure. Sign locations are provided for at least one object of the operand type, of the connection type and of the assignment type. In some embodiments, data corresponding to the selected word of the transcript is changed to reflect the edit without changing data defining the relative timing of those words of the transcript that are not adjacent to the selected word.