Patent ID: 7765233

Claim:
A computer-readable storage medium, comprising: a data area storing data by data-recording block unit, the data area including a user data area and a spare area, wherein the data which are stored in at least one of the user data area and the spare area, includes an address unit, the address unit including a plurality of address fields and control information, each address field indicating an address of a corresponding sub-data-recording block unit within the data-recording block unit, the control information including status information and second address information, the status information indicating the status of the stored data contained in each individual sub-data-recording block unit included in the data-recording block unit, the second address information indicating an address of a previous original data recording block unit, wherein if the data-recording block unit is recorded by substitution of the previous original data-recording block unit, the second address information includes a first physical sector number of the previous original data-recording block unit, and wherein if the second address information is set to zero, the data-recording block unit is not a substitution for the previous original data-recording block unit.