a defect area management system for an optical storage medium including a management part producing a defect area management signal for real - time processing and transmitting the signal along with data to be written ; and a write part executing a defect area management of the optical storage media , writing the data , applied by the defect area management signal from the management part , into the optical storage medium so that whenever a light pickup meets a defect block at the time of writing data requiring the real - time processing into the optical storage medium , it does not have to be moved to the spare area , thus reducing the time it takes to move the light pickup and removing shortcomings of the real - time processing .