1. The music in the CD is in cda format. cda is commonly known as CD audio track, which is the file format in CD music discs that people are familiar with. CDs can be played in CD players or replayed using various playback software on computers. A CD audio file is a cda file, which is just index information and does not really contain sound information, so it does not matter the length of the CD music. The cda files seen on the computer are all 44 bytes long. You cannot directly copy CD format cda files to the hard disk for playback. You need to use Windows Media Player/Format Factory to convert the CD format files into WAV.

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5. CD substrate The thickness is 1.2mm, the diameter is 120mm, there is a hole in the middle, and it is round. It is the shape of the optical disc. The reason why the optical disc can be picked and placed at will mainly depends on the hardness of the substrate. One-time recording CD-R discs mainly use (phthalocyanine) organic dyes. When the disc is being burned, the laser will burn the organic dyes coated on the substrate, directly burning them one after another. Pit, so that the state of having a pit and not having a pit forms signals of 0 and 1.

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