A method of manufacturing a near-field optical head. A cylindrical connection shaft having a first rotational axis is provided near the proximal portion of the first arm. The benefits of these systems are higher service lifetime and low thermal conductivity to achieve high operating temperatures. The container body includes a pressurized fluid introduction port for introducing the pressurized fluid to the inside and a liquid delivery port for delivering the liquid to the outside. New reference fingerprints will tend to be placed in partitions that have relatively lower access rates that the other partitions, which will tend to balance the search loads on the partitions by the media identification system. The mixer includes an anti-parallel series arrangement of diodes in one or more ring quads to increase the input 1 dB compression point and third-order input intercept point, while maintaining the benefits inherent with even harmonic mixing.