The simulation runs all the steps involved in burning a medium apart from activating the laser beam, so that you can assume that if the simulation is successful, the burning process will also be successful.
We recommending running a simulation if you are decompressing data before burning, e.g. when burning an audio CD from MP3 files. To play MP3 files on a CD player, the files have to be converted to the corresponding format (CDA). In Nero, this decompression takes place during the burning process. It takes up computer time, which can result in a buffer underrun on older systems. Pentium 3 systems or higher can decompress data and burn at high speeds simultaneously.
Note: You do not need to run simulations if you are using a recorder with buffer underrun protection.