A storage device assembly includes a tray receiving a hard disk drive therein, a bracket attached in the tray, and a chassis. The first FET and the second FET are cascode-connected to each other. A carrier supports the surface for reciprocating motion with respect to the light beam to form one axis of a raster. The rectangular tips and the square tips have simple shapes, so known commercially available throwaway tips may be used. The method further includes forming an opening in the transparent layer, the opening being aligned with the isolation structure. To prevent pieces of crop material from accumulating on top of the housing structure for the feed rolls and the chopper drum, a flexible shield is mounted between the bottom of the operator’s cab and the top of the crop gathering device.