Systems and methods for providing content are described. The disposable housing portion secures to the patient and may be disposed of after it has been in use for a prescribed period. After the list is stored, one or more primary configuration routines which utilize the first operating mode are located within the one or more first nonvolatile memories and executed. A pickup head is attached to the free end of the piezoelectric bender opposite to the coil, and via the piezoelectric bender, focusing and tracking motion of the pickup head can be tuned at the same time. The power segment is configured to provide variable voltage protection of each segment. Further, the heat exchanger has a preliminary fixing portion by which the pin and the cap part are preliminarily fixed to each other before being bonded with the brazing material.