The present invention includes a method and apparatus to write and read copy protected data on a disc drive storage system using a servo wedge. A signal combination unit replaces in response to a first control signal at least a part of the first TV signal by the second TV signal so as to obtain a composite TV signal. Each SST module can include an SST and a sense resistor. The extension portion adopts a flexible soft lining having length longer than the connecting portion, and provides an allowance for displacement and extension of the legs of the user when wearing the shoe coverings, thereby enabling unhindered large extending movements of the legs. The conducting spacers electrically connect the second conducting film over the first substrate with a third conducting film on the second substrate. The flexible spring connector gives the center assembly improved torque and flexure characteristics, which allows the occlusion device to better conform to the contours of the heart.