Organosilicon compounds bearing keto or aldehyde groups are easily prepared in high yield by oxidation of a carbinol-functional precursor by an oxidizing agent in the presence of a nitrogen-containing free radical mediator which contains aliphatic, cycloaliphatic, heterocyclic, or aromatic NO\u2014, NOH\u2014, or H\u2014N\u2014OH group. The land prepits have a radius of mean curvature smaller than a radius of mean curvature of sides of the groove tracks in land-prepit absent regions of the land prepits and are defined by curved surfaces continuously extending from the sides of the groove tracks. The screw thread region or zone of the fastener has a relatively lesser hardness suitable and may be pre-threaded or later threaded by engagement with a thread forming screw. The capacitor is coupled to the negative node. After that, with two photo resists 168-S and 168-M as a mask, patterning is performed for the films, a layered product of the films formed according to the photo resist 168-S is taken as a gate electrode of a selection transistor S, and a layered product of the films formed according to the photo resist 168-M is taken as a gate electrode of a memory transistor M. The invention is characterized in that the bottom is provided with cams andor beads .