An Enhanced CD is an audio CD that includes CD-ROM data such as video, photos, web links and more. Audio CDs have 74 minutes of available space, but most recordings only contain about 60 minutes of music. An Enhanced CD (E-CD) uses this leftover space to include additional data. In an audio player, an E-CD simply plays music, but on a PC or Mac it launches the additional content, to give your fans that bonus content they want.