The present invention provides recording media comprising nanoparticles, methods of stabilizing recording media against electromagnetic radiation, methods for enhancing the substrate independent durability performance of recording media, and methods for color density and hue control. The enhanced creep resistance is the result of controlled devitrification of the fused quartz article. , a slight lateral movement of the support arm distal end to which a load beam is mounted in response to vibration-induced bending of the support arm. The tracks of each logical line are cross connected by in-plane cross connects formed in the same layer by the same process that is used to form the electrodes. The cam angle sensor is inserted in a through-hole perforated through the head cover, and a mounting portion integral with the cam angle sensor is fastened to a member of the cylinder head, with fixing members penetrating through the head cover on a side of the cam angle sensor.