The photoresist material is burnt by the laser, the photoresist is cured and unexposed photoresist rinsed off, and the resulting data-bearing glass master is then electroformed with a metal such as Ag or Ni (step 26) to form a father, in the case of a disc, known as the ???father disc.??? The father disc may be used as a template to make a mirror image disc, known in the art as the mother disc (st