Patent ID: 8289820

Claim:
An address generating method in a recording medium having an area for recording data of a structure of recording layers and clusters and addresses indicating physical recording positions on the recording medium, wherein: the addresses are addresses including layer number addresses indicating numbers of the recording layers, cluster number addresses indicating data positions of the clusters, and in-cluster count values for counting the inside of each of the clusters; when a bit allocation in a disc of 25 GB (Gigabytes) per layer is formed from a layer number address of h bits (h: natural number), a cluster number address of i bits (i: natural number) and a count value of j bits (j: natural number), the recording medium having a capacity larger than 25 GB per layer has a bit allocation which is formed from a layer number address of h bits, a cluster number address of (i+k) bits (k: natural number) and a count value of j bits; the k indicates a number of address bit extended by a virtual bit; the virtual bit indicates whether lower two bits are a repetition of an increment and is used as an extended bit of the cluster number addresses; and an address bit of (h+i+j) bits is arranged on the recording medium by virtually embedding the virtual bit.