A media cassette for an automatic dispenser which can be used easily and solve problems of incorrect operations when a push plate is locked since if the automatic dispenser receives the cassette having a locked push plate, locking is automatically released. The device has a gripper head fitted with gripping means such as suction cups, magnets, tongs, etc. In particular, by the method of managing data using information stored in a defect management area, generation of errors is prevented in reading or writing due to the change of a physical position of a real-recorded file which are caused by wrong calculation of the start logical sector numbers for each zone. Combining the appropriate running calculations for a particular window position yields the final result for that position. An insulation spacer above the etched-back first conductive filling is formed in the trench and a second conductive filling is provided in the trench as an upper part of the gate electrode.