Optical Storage uses indentations on the surface of a disc to represent binary data.

CDs, DVDs, and Blu-Ray discs are all forms of Optical Storage.

CDs store around 700MB of data; DVDs store roughly 4.7GB; and Blu-Ray discs can hold up to 25GB.

There are three forms of Optical Storage discs: ROM (read-only), R (write-once), and RW (rewritable)

Optical discs are very portable, and quite cheap (<5p per GB).

However, they can be damaged easily by scratches, so are not very durable. Also, they have very low capacity, and slow read/write speeds.

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Would a video game be stored on DVD-ROM, DVD-R, or DVD-RW?

DVD-ROM, because it shouldn't be rewritten.

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