An earlier music CD that contained all the songs in the standard CD audio (CD-DA) format on the top layer of the disc and the higher-fidelity SACD format on the bottom layer. Hybrid SACD discs became available in 2003. A combination CD/DVD-Audio disc was also available (see
Flip Disc) that used two sides rather than two layers, because DVD players look for the CD layer first. See
SACD and
DVD-Audio.