DVD-5 - This is the most common replicated DVD produced. A DVD-5 will hold approximately 4.7 GB data or 120 minutes of high quality audio and video. A DVD-R is suitable as a master for replication. Also called Single Sided Single Layered. This is the most common DVD Media, often called 4.7 GB Media.
DVD-9 is increasing in popularity due to its ability to hold up to 4 hours of audio and video or 8.5 GB of data.