Hard disks use magnetic charges to represent 1s and 0s. How about optical discs?
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Unlike hard disks, which are magnetic charges to represent 1s and 0s, optical discs use reflected light. The 1s and 0s are represented by flat areas called lands and bumpy areas called pits on the disk surface. For example, DVD, Blu-ray etc.
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Hard disks use magnetic charges to represent 1s and 0s. How about optical discs?
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