1.
optical disc
A storage medium read and written with a laser, such as a CD, DVD, or Blu-ray disc. Data is recorded as pits on a reflective surface.
Formed from 光学 (optics, optical) + ディスク (disc). The umbrella term for laser-read media such as CD, DVD, and Blu-ray.
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Similar words
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ハードディスク (hard disk)