In response to the above poster regarding replication vs duplication.
Yes there are differences in the manufacturing process, however, duplicated discs are no way near as bad as the poster is making out.
They use to cause far more problems in the early days of CD burning (10-15 years ago), however newer CD players and DVD players can handle duplicated discs just fine mostly.
For more info on the diferences in the 2 process you can see here:
CD Duplication Vs
CD Replication
Duplicazione CD