Blue Book (CD Plus)

A subset of the Orange Book specification, the Blue Book standard was designed expressly for stamped multisession discs limited to two sessions, one music and one data. Also known as CD Plus, Blue Book is a defined, licensed standard supported by Philips, Sony, Microsoft, and Apple. Discs play on CD-Audio players with no possibility of producing static and on computers with newer CD-ROM drives.

Prior to the Blue Book standard, it was possible to record an Orange Book disc with Red Book audio and have the audio written to the second track. Most CD players would get fooled into thinking the first track was audio and play the data track. The result was a loud static noise that could easily damage audio playback equipment.

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