One embodiment is directed to a method for use in a computer system comprising at least first and second computers, wherein the first provides content addressable storage. The filter has an adsorbent for adsorbing impurities selected from the group consisting of a higher hydrocarbon, ammonia, an odorous substance, hydrogen sulfide and a mixture of two or more of these substances. The method of Claim 1 further comprising, prior to the annealing step, depositing an amorphous carbon optical absorber layer on the main conductor layer. Thus, after the re-flow, the metallic powder does not remain in a flux residue in a state where migration is likely to occur, thereby combining both solder connectivity and insurance of insulation.