Embodiments of the present invention provide a computer system, comprising a personal file system module for determining a file system folder structure based upon a user profile and mapping user content stored on one or more storage devices to one or more folders of the file system. In a semiconductor device having a field-effect transistor with a vertical columnar structure, an n-type diffusion layer region is formed in a surface layer of a p-type silicon substrate. and a pressure of H2 gas to form a complex hydride material.