Patent ID: 7366066

Claim:
An information recording apparatus comprising: formulating means for formulating the information of an anchor information area of such a data structure having one header table and one or more loop table(s), said header table having a preset number of pointing blocks, each of said loop table(s) having a preset number of updated blocks; first recording means for recording, in one of said pointing blocks of said header table, data indicating that said pointing block has a currently effective information, data specifying one said loop table having the currently effective information, a first defective bitmap indicating any of the pointing blocks being defective, and a second defective bitmap indicating any of the updated blocks being defective; second recording means for recording, in said one updated block in said currently effective loop table, data indicating that it has the currently effective information; and third recording means for recording the address information in said currently effective updated block, said address information indicating the location which file management data is recorded therein, wherein said loop tables include updated blocks that are configured to hold file system location information, and said pointing blocks including information designating which loop table is presently valid.