Users new to audio editing are often surprised to find that they cannot import the audio from CDs into Audacity with the File > Import > Audio command. Maximum number of index points (subdivisions of a track) is 99 with no maximum time limit.Minimum duration for a track is 4 seconds (including 2-second pause).The basic Red Book specifications state that: However, because the data is a stream with a TOC ( Table of Contents), rather than a set of self-contained files, most operating systems cannot open the audio for editing in the same way that a WAV or AIFF file can be opened. Audio CD quality sounds identical to those formats. This is very similar to (though not directly comparable with) stereo WAV and AIFF files encoded at 16-bit, 44,100 Hz. The Red Book standard is a 16-bit, 44,100 Hz PCM stereo stream of audio. The vast majority of audio CDs are encoded according to the Red Book Standard.
Mini CDs are sometimes used for CD singles or device drivers, storing up to 24 minutes of audio. The Mini CD has various diameters ranging from 60 to 80 mm. Standard CDs have a diameter of 120 mm and can hold up to 80 minutes of uncompressed audio (700 MB of data). although sales of commercial CDs have been falling for some years while digital downloads (for storage on hard drives or flash-based music players) have been increasing. They remain the standard physical storage medium for audio. Audio CDs have been commercially available since October 1982. It was originally developed to store sound recordings exclusively, but later it also allowed the preservation of other types of data. A Compact Disc (also known as a CD) is an optical disc used to store digital data.
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