Replication is a manufacturing process. DVDs are produced in 2 steps:
DVD (digital video disc) is 120 mm in diameter and 1.2 mm thick, the same size as CDs. The main function is to store standard definition video for feature films. DVD discs have a maximum resolution of 480p (NTSC, 720×480 pixels) or 576p (PAL) 720×576 pixels). Pre-recorded DVDs are mass-produced using molding machines that physically stamp data onto the DVD. Such discs are known as DVD-ROM, because data can only be read and not written or erased. Blank recordable DVD discs (DVD-R and DVD+R) can be recorded once using a DVD recorder and then function as a DVD-ROM.
Over runs and under runs are only applicable to replication orders. Due to the industrial nature of the replication process and our high quality control standards, replicating the precise number of the order is not always possible. Hence, we maintain a 10% over run and under run cushion. But no matter whether it is an over run or an under run, you pay only for the number of discs actually delivered.