The compact disc industry started when Philips and Sony introduced the Compact Disc Digital Audio Standard, which is commonly known as the Red Book. The Red Book describes the Audio Compact Disc (CD) that you find in music stores today. It is the foundation on which all the other CD standards are built. Because audio discs are manufactured per the Red Book Standard, all audio compact discs will play in any audio compact disc player. This interchangeability has been a major factor in the growth of the CD music industry.The track type defined in the Red Book is: CD-Digital-Audio (CD-DA), for audio music. The Red Book specifies the audio is on the CD in one or more tracks. Each track is normally one song. These tracks are further subdivided intosectors that are 1/75th of a second in length and contain 2352 bytes of audio data in digital form.

Photo CD, Audio Standard, ISO 9660, Compact Disk