An information recording system, where new data recording is started from LRA (old) and a record error is detected, at position P0, an extent is closed and the record position is made to jump from the position P0 to position P1. Further, a new extent is set, at the position P1 so that the data recording is continued. Further, a range from the position P0 where the record error was detected to the position P1 where the new data recording was started is registered, as a defect sector.