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 skip the pregap area since it usually contains no sound; therefore, CD-i Ready was presented as a different approach to CD-i (which stores data in the initial track's regular indexes) to improve its compatibility with audio CD players.