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. When at least one defective area is detected in the...http://www.google.com/patents/US20060195717?utm_source=gb-gplus-sharePatent US20060195717 - MUTLI-LAYERED INFORMATION RECORDING MEDIUM, REPRODUCTION APPARATUS, RECORDING APPARATUS, REPRODUCTION METHOD, AND RECORDING METHOD
