An embodiment of the present invention includes rotating an integrated disc formed by temporarily fixing an initialization reference plate to an uninitialized optical disc that is an optical disc to be irradiated with a light beam of light having a predetermined or higher intensity to record information as a recording mark. The processing module converts data bits of the input parallel bit stream into an input digital symbol and inputs a set of gain adjustments and phase adjustments that compensate for a channel distortion. A reactive silicate is added to coat the cores with silica. In the diagnostic method, a sensorless system and a sensor based system are checked against each other to determine if either of the systems is faulted. The flexible communication link is coupled to the motion control device wherein the motion control device limits relative motion between the flexible communication link and the support. A first guide disposed at least partially circumferentially on the first shaft proximally to the first exit port is provided, and a cable extends along the interior region of the first shaft and exits the first shaft at the first exit port, the cable looping at least partially around the first shaft and affixed at the first fixed point.