FIELD: information technologies.
SUBSTANCE: recording medium comprises several record layers. Each of layers includes areas of testing. Areas of testing, contained in neighbouring areas of recording, are not physically placed in one and the same positions relative to optical beam. Meanwhile, areas of testing, assigned to N layer of record and (N+2) layer of record are physically placed in one and the same positions relative to optical beam. Areas of testing, assigned to (N+1) layer of record and (N+3) layer of record are physically placed in one and the same positions relative to optical beam, therefore, arrangement of all testing areas is made according to zigzag circuit.
EFFECT: reduced mutual interference between areas of testing.
12 cl, 9 dwg
