This it is the masters that will be used in the manufacture, as it is described next.

As we had said, all the process of production of the masters is developed in clean cameras with leaked air and where the precision of the process demands, for example, that the processes on discs of glass or zinc are made not on tables, if not on supports sustained by air to pressure to avoid even de smaller vibration of the ground.

When the amount of Cds to produce is very great (million of copies) we make a copy of the master called “mother” and from this one we made another copies called “sons” that are going to allow us to use several engravers machines simultaneously.

In the pictures we could see how we transform the cylindrical disc into a cd with the required files: