Patent ID: 8588043
Filing Date: 2013-11-19
Classification: G11B

Abstract:
1. In an recording medium provided with a plurality of recording layers having areas where a plurality of clusters for recording data are recorded, the recording medium comprising: an area where a first address is recorded, the first address being added to a cluster for recording, the first address indicating identification of clusters and an intra-cluster position, and a second address is recorded by being wobbling-superimposed on a track on which data is recorded in synchronization with the cluster, and the second address indicating information including identification of clusters and an intra-cluster position; wherein the first address is an address recorded by being added to actual data; wherein the second address is an address indicating a physical recording position on the recording medium and includes: a layer number address indicating numbers of the plurality of recording layers, a cluster number address indicating data positions of the plurality of clusters, and a count value for counting an intra-cluster of the cluster; wherein a 12-bit data structure includes disc information data, and is configured by dividing a block to which a first error correction code is added into a plurality of parts, and the second address; wherein a code string is generated by adding a second error correction code to the 12-bit data structure, wherein the code string is recorded on the recording medium with the code string modulated; wherein a virtual bit which indicates whether or not the regularity of low-order 2 bits of the second address is switched, and is used as an expansion bit of the cluster number address, and is not recorded on the recording medium is virtually imbedded as the most significant bit of the cluster number address; wherein the regularity of low-order 2 bits either includes repetition of increments or does not; and wherein bits other than the low-order 2 bits are recorded as they are, without changing values or regularities thereof.