In a data holding mode, data storage in a one bitone cell scheme in a normal operating mode are rearranged into data storage in a twin-cell mode in which data are stored in a one bittwo cell scheme. A method for construction of a solid immersion lens structure includes providing a mold defining a lens shaped cavity in which a solid immersion lens is cast, casting a translucent liquid elastomeric material into the lens cavity, permitting the elastomeric material to set to form the solid immersion lens portion and removing the solid immersion lens portion from the mold. Accordingly, large elements, such as monopiles for wind turbines, which may comprise a steel tube having a diameter in excess of 5 meters, or even tunnel sections, can be installed by utilizing a number of relatively small impact drivers. The partially packaged food product is then ultrasonically edge sealed around the food product by an ultrasonic food product packaging fin-sealing unit forming a partially sealed food product packaging.