Patent ID: 8582404
Filing Date: 2013-11-12
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 recorded, by being wobbling-superimposed on a track on which data is recorded in synchronization with the cluster, the second address indicating information including identification of clusters and an intra-cluster position; wherein the first address is an address which is recorded by being added to actual data, and wherein the first address is recorded after an error correction code is added to the first address; 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 an intra-cluster count value for specifying a physical position of the cluster; 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 in the second address; and wherein the regularity of low-order 2 bits indicates repetition of increments or not.