A dual layer disc is just like an regular DVD disc that is used to play movies and store data, its the same shape and size, however an dual layer disc has an extra layer on it, so in total it allows up to 8.5GB of data to be burned onto the disc, so it can store more data, if compared to an normal DVD disc, which has an maximum data capacity of 4.7GB used for data storage. Due to a dual layer disc having more potential of storing more data, they are more expensive to buy, as the cost more for companies to create, if you want to use them to burn Xbox 360 movies or films that are very long.
So will dual layer DVDs play in all DVD players?
They can play in DVD players that support dual layer disc playback, this should be an issue today, as most modern regularly DVD players support them type of discs, as well as the normal ones. However some older style household and portable DVD players might not support them and will give an error message that is displayed on your television screen, saying that it can't read the disc. If you are playing dual layer discs on your computer or laptop, the disc drive has to also support dual layer playback, chances are if you have burned a movie using the disc drive in your computer or laptop, then it can be watched. If not then you will need to upgrade your disc to drive and replace it with one that supports dual layer discs.
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