CD is short for Compact Disc; it refers to laser disk with a diameter of 12 cm and thickness of 1.2 cm. We usually call Laser Disk and Compact Disks as disks. But they have some differences. The image of laser disks is recorded by analogy and the audio is recorded by partial analogy or analogy mixed with digital. CD is to record and play sound and LD is to record and play image.
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