Since most CD players 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.
Most CD players ignore the pregap area because it typically contains no sound; thus, CD-i Ready emerged as a solution for CD-i (which places data in the initial track's regular indexes) to better align with audio CD players.