A writable recording medium, an identification information recording method, an information recording apparatus, an identification information playback method, and an information playback apparatus capable of easily determining whether or not a disc is genuine or copied. A first disc ID played back from a PMA (program memory area) is read and a PA (program area) is played back to read a second disc ID recorded in the PA. If they correspond to each other, a disc is determined to be a genuine disc. If they do not correspond to each other, the disc is determined to be a copied disc. Since a unique disc ID is recorded in the PMA when the disc is initialized, a disc ID of a genuine disc is different from a disc ID of a copied disc from the start. This difference is used as disc identification information. By recording a disc ID of a genuine disc in the PA, the determination can be realized.