Aspects of the present invention are directed to a propeller protector that can accommodate propeller of different sizes and is designed to be easily installed or removed from a propeller. Holes are injected into the charge-trapping layer from a gate electrode side. The radiation source is situated at the side of the second substrate. The constraint includes a minimum number of contacts per device or power vias per device. The plurality of data segments may be stored in a second arrangement on the storage medium based on the identified access pattern.