Multi-layered information recording medium, reproduction apparatus, recording apparatus, reproduction method, and recording method

A multi-layered information recording medium, comprising:

• a plurality of recording layers;
• a user data area for recording user data, provided in at least two of the plurality of recording layers;
• and
• a defect list storing area for storing a defect list that is information for managing a defective area detected in the user data area,
• wherein the defect list storing area is provided in a prescribed layer of the plurality of recording layers,
• the defect list is information for managing a defective area detected in the prescribed layer and a defective area detected in a recording layer other than the prescribed layer,
• at least one of the plurality of recording layers other than the prescribed layer comprises a spare defect list storing or area that is used to record the defect list when the defect list storing area is not usable,
• the multi-layered information recording medium further comprising an area for storing a management information that is information for managing usage states of the defect list storing area and the spare defect list storing area, and
• the management information indicates whether or not the defect list storing area is used and whether or not the spare defect list storing area is used.