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All digital data is represented as one's and zero's.

The actual physical representation of data on an optical disc - assuming you are talking about CD's - is called pits and lands.

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Q: How do data represent on an optical disc?
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How is the Optical disc similar to the compact disc?

A compact disc is a type of optical disc. "Optical disc" is an umbrella term for any type of storage media which uses optical technology (as opposed to magnetic) for data storage. This includes but is not limited to DVDs, CDs, H-DVD, blu-ray, laser discs CDRW's, and DVDRW's


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