I asked our DVD Duplication supplier how they do the duplication of our Yoga DVD's , as their DVD duplication quality is a whole lot better quality that the ones I burn on my own computer and the price is amazing to boot. This is what they told me. I thought that it was worth putting on the site.
"Commercial DVDS in bulk quantities are replicated ( as opposed to duplicated as you have indicated) by means of a glass master. The process of DVD Replication produces a far better result that DVD Duplication and your new DVDS will play on a wider range of players, if they are replicated . The replication process is one that needs a very clean environment.
Before we start the replication the glass mastering has to be done. This is done in a Class 100 clean room to prevent pollen, dust, hair or other contaminants from damaging the master. Which means we are all air showered up before we enter the DVD production facility .
During the glass mastering process a glass substrate is used to hold the glass master.
A glass substrate is underlying layers of glass which are circular plates of glass roughly 6mm thick and 240 mm in diameter. One side is refined until it is very smooth. The extra surface area on the underlying glass layer allows for better handling of the glass master and prevents marking or scratching to the pit structure when the father stamper is separated from the glass substrate.
The glass master is cleaned with solvents then placed on a spinner that spins the glass and rinses it and then applies the resist. The resist is spun across the face of the glass giving it an even coating accomplished by means of the rotation. Once the substrate is baked it is then ready for the mastering.
A LBR or Laser Beam Recorder device is used for the mastering.
Then the DVD replicaiton process begins . Discs are then molded stamped and
laquared as per this video we have up here. ( I have embedded from you tube
)
Watch it it is worth educating yourself.
This is the replication process not the duplication process.