The optical information apparatus and an optical storage medium and optical storage medium inspection apparatus and an optical storage medium inspection method

The optical information apparatus, by irradiating a light beam to the optical storage medium, by receiving the light beam reflected from the optical storage medium, an optical pickup head that outputs a signal based on light received, the optical pickup head a jitter measuring unit for measuring jitter in signals output from the and a discrimination unit for the optical storage medium from the measured jitter to determine whether good or defective, the jitter measuring unit, the digital information more the length of the integer k and the period T and the basic is relative to the optical storage medium is recorded as a mark or space sequence of kT, to measure the jitter for more mark or space sequence 3T.