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Track (CD)
On an optical disc, a track (CD) or title (DVD) is a subdivision of its content. Specifically, it is a consecutive set of ''sectors'' (called "timecode frames" on audio tracks) on the disc containing a block of data. One ''session'' may contain one or more tracks of the same or different types. There are several kinds of tracks, and there is also a sub-track index for finding points within a track.
==Audio tracks==
Audio tracks are defined in the Red Book specification for CD Digital Audio (which was the first CD specification). One song or movement usually comprises one audio track, containing audio in the form of raw PCM samples in 16 bit/44.1 kHz resolution in 2 channels, and a subcode multiplexed with the audio data. In this mode, each sector (called a frame) consists of 2352 bytes of audio data (1176 16-bit samples, or 588 stereo samples, which equals 1/75 second of audio (therefore SMPTE time code equivalent for the audio data consists of hour:minute:sec:frame, where frame ranges from 0 to 74). CIRC error correction is used for the data.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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