A write-once type optical recording medium is provided, which is low-cost and capable of maintaining the recording and reproducing stability high while enabling the relative ratio of read power to write power to be set high. The first substrate is formed to be thinner than the second substrate. The decision algorithm is adjusted based on the ID information. 25 to about 10 weight % of at least one compatibilizer, said percentages being based on the total weight of the polymer blend;where the polymer blend has a higher zero shear melt viscosity than polymers and separately. The catalyst is produced by the following steps to : preparing a slurry for spray-drying by adding an acid and an aqueous solution of cupric nitrate in a pseudo-boehmite alumina slurry; spray-drying the slurry; and burning the particles obtained in step.