1. The music in the CD is in cda format. Cda is the so-called CD audio track, which is a familiar file format in CD music discs. A CD can be played in a CD player, and can also be played back by various playing software in a computer. A CD audio file is a cda file, which is only an index information, and does not really contain sound information, so no matter the length of CD music. The cda files you see on the computer are all 44 bytes long, so you can't directly copy the cda files in CD format to the hard disk to play. You need to use WindowsMediaPlayer/ format factory to convert the CD files into WAV.

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5. The thickness of the substrate of a CD is 1.2mm, the diameter is 12mm, and there is a hole in the middle, which is a circular shape, which reflects the shape of the CD. The reason why optical discs can be taken and placed at will mainly depends on the hardness of the substrate. The CD-R optical disc with one-time recording mainly uses (phthalocyanine) organic dye. When this optical disc is burned, the laser will burn the organic dye coated on the substrate and directly burn it into pits one after another, so that signals of and 1 are formed in the state with and without pits.

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