what size are dvd discs
The 12 cm type is a standard DVD, and the 8 cm variety is known as a MiniDVD. These are the same sizes as a standard CD and a mini-CD, respectively. The capacity by surface (MiB/cm 2) varies from 6.92 MiB/cm 2 in the DVD-1 to 18.0 MiB/cm 2 in the DVD-18.