Mark the end of each session on the disc.
On CD media it is the area that follows each program area. The main channel in the Lead-out area contains audio or data null information. This area is coded as track AAh.
The DVD Lead-out area is the area comprising physical sectors 1.0 mm wide or more adjacent to the outside of the data area in single layered disc for PTP (Parallel Track Path) disc. Or the area comprising physical sectors 1.2 mm wide or more adjacent to the inside of the data area in layer 1.