Boundary Detection Apparatus, Boundary Detection Method, Boundary Detection Program, and Information Recording Medium

摘要

A boundary detection apparatus is provided that can quickly and accurately detect an end of a recorded area even if there is a defect caused by a scratch or a extraneous matter adhered on the recording face of a CD, or the CD itself is decentered.;When it is detected that information is recorded at a predetermined dividing point B, a pickup is moved to a dividing point C located ahead seen from the dividing point B after moving. On the other hand, when it is detected that information is not recorded at the dividing point B, the pickup is moved to a dividing point A located on the opposite side from the dividing point B, and the pickup is further moved after the end containing range is ultimately determined. Thus, an end is detected.