DVD is similar to a CD in that it is an optical device and that a laser is used to store the data and read the data. A single sided DVD can store about 4.7 GB of data. DVDs which store data on both sides can hold over 9 GB of data. One problem with the DVD is that the different companies which make them haven't agreed on a standard format. Because of this, you will see various kinds of DVD disks for sale: DVD-R, DVD+R, DVD-RW and DVD+RW.
Advantages
- Very large storage capacity
- Sound and picture quality is excellent, making them ideal for storing films with video and sound.
- DVDs are now mass produced so they are relatively cheap
- DVD players can read CDs
Disadvantages
- DVDs do not work in CD drives
- There is no single standard of DVD
- They can be easily damaged by breaking or scratching
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