FD-shaped adapter used for card-shaped memory device having comparatively large thickness and solidly-built structure

An FD-shaped adapter which has a 3.5-inch flexible disk (FD)-shape and which is used for a card-shaped memory device so that the card-shaped memory device is removably inserted therein, said FD-shaped adapter being inserted into a flexible disk drive (FDD) in order to record/reproduce data to/from the card-shaped memory device through the FDD, said FD-shaped adapter having a base case, an electric circuit portion, a top cover, and a bottom cover, said base case being made of resin and provided with a cut-out portion formed so as to boring through upper and lower surfaces of said base case, said electric circuit portion being mounted on said upper surface of said base case, said top cover being made of metal and covering the whole of said upper surface of said base case, said bottom cover being made of metal and covering said cut-out portion at said lower surface of said base case;

• wherein:
• said bottom cover has a plate-shape and is provided with a bottom plate, side plates upwardly extended from side edges of said bottom plate, and flanges outwardly extended from each top edge of said side plates;
• said bottom cover being attached on said base case so that said flanges are sandwiched between said upper surface of said base case and an inner surface of said top cover.