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Hard disk: It is common for the hard disk in a desktop computer store 500 GB of data or more. Access to the data on a hard disk is very fast.

A DVD looks much the same as a CD. A single sided, single layer DVD can hold up to 4.7 GB on one side. In contrast, a dual-layer DVD can carry two layer of data on each of its two sides: this means it can hold up to 18 GB of video, audio or other information.

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Q: What are the similarity between a DVD-R and a DVD-RW?
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