
DVD5 - This is the most common replicated DVD produced. A DVD5 will hold approx 4.7 GB data or 120 minutes of high quality audio and video. All DVDs contain two substrates that are bonded together. On a DVD5, one substrate contains the data on one layer and the other is a pitless layer without any information. A DVD-R or DLT (digital linear tape) is suitable as a master for replication.
DVD9 - This DVD format can hold up to 4 hours of audio and video or 8.54 GB of data. It is a dual layer disc. Many films are now produced on DVD-9 because there is more capacity for extra features such as trailers and cast interviews. A DLT is the only acceptable master for this type of DVD.
DVD10 - On a DVD10, both layers contain information. The DVD needs to be turned over in order to access the information on the other side. For this reason, a DVD10 can only be printed around the hub. A DVD10 can hold about 4 1/2 hours of audio and video or 9.4GB of data.
BluRay DVD- The next generation high capacity DVD which will be competing for market dominance. This disc holds a whopping single layer capacity of 25GB which is enough for approx two hours of high definition video. A blue-violet laser is used to read and write data at a shorter wavelength than conventional CDs and DVDs. This allows more capacity to be crammed onto a disc. HD-DVD is the other blue laser high capacity disc. The HD-DVD has a single layer capacity of 15GB.
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