CD-i Ready is a

compact disc The compact disc (CD) is a digital optical disc data storage format that was co-developed by Philips and Sony to store and play digital audio recordings. In August 1982, the first compact disc was manufactured. It was then released in O ...

format for mixing audio and data content on a CD. It was developed by Phillips in 1991, based on the

CD-i The Compact Disc-Interactive (CD-I, later CD-i) is a Digital media, digital optical disc data storage device, data storage format that was mostly developed and marketed by Dutch company Philips. It was created as an extension of Compact Disc Di ...

format. The CD-i Ready format uses a certain technique to get audio CD players to skim over the CD-i software and data. CD-i Ready places the software and data in the

pregap The pregap on a Red Book audio CD is the portion of the audio track that precedes "index 01" for a given track in the table of contents (TOC). The pregap ("index 00") is typically two seconds long and usually, but not always, contains silence. Po ...

of track 1 (index 0).Application Note 'CD-i Ready' disc
''Philips Interactive Media Systems'' - October 1991 Technical specification of the 'CD-i Ready' type disc. CD-i Ready is an Audio-CD with CD-i data located in the pre-gap before track 1. Contains info for producers of CD-i players and creators of CD-i titles. Since most

CD player A CD player is an electronic device that plays audio compact discs, which are a digital optical disc data storage format. CD players were first sold to consumers in 1982. CDs typically contain recordings of audio material such as music or audio ...

s assume that the pregap area contains only silence, they skip it. Because of this, CD-i Ready was presented as an alternative to CD-i (which stores data in the regular indexes of the first tracks of a disc), which was more compatible with audio CD players. The term "

enhanced CD Enhanced CD is a certification mark of the Recording Industry Association of America for various technologies that combine audio and computer data for use in both Compact Disc and CD-ROM players. Formats that fall under the "enhanced CD" ...

" is sometimes used to refer to different CD formats that support a mix of audio and data content. Apart from CD-i Ready and CD-i, these formats include mixed mode CDs and the

Enhanced Music CD The Blue Book is a compact disc standard developed in 1995 by Philips and Sony. It defines the Enhanced Music CD format (E-CD, also known as CD-Extra, CD-Plus and CD+), which combines audio tracks and data tracks on the same disc. The format was ...

format. I ready is now banned in America and India. Recent studies have shown it is very unhealthy to.

References

Compact disc {{Electronics-stub