| http://www.w3.org/ns/prov#value | - Therefore, if it is aimed at the optical disc 100 in which the reflectance of the laser beam LB is increased by forming the marks, it is judged whether or not the signal level of the minT space (and more specifically, the signal level of the peak of the minT space, i.e. the minimum signal level of the minT space) is greater than or equal to the zero level (or the reference level).
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