Patent ID: 7916617
Filing Date: 2011-03-29
Classification: G11B

Abstract:
1. Record carrier comprising marks for recording information and a record carrier identification recorded using at a first pattern comprising at least one mark and a second pattern comprising at least one mark, and a third pattern, wherein at least the first pattern and the second pattern are located such that marks of the second pattern can be read simultaneous together with marks of the first pattern by a single read-out spot; and the first pattern and the second pattern are predetermined recognizable patterns in a predetermined positional relationship in the spiral direction whereby a deviation in the predetermined spiral relationship would be recognizable, wherein the first pattern is located in a first track and the second pattern is located on a second track directly adjacent to the first track; and the third pattern is located on a third track directly adjacent to the first track wherein first pattern and the second pattern and the third pattern are aligned in a direction perpendicular to a reading direction and the second pattern and the third pattern are identical.