Mixed Mode CD

A Mixed Mode CD is a Compact Disc in which two different data types are combined. Typically the first track is a data track while the rest are audio tracks. The most common use for Mixed Mode CDs are to produce enhanced CDs in which a music CD is coupled with multimedia content.

Some CD players from the 1990s may have trouble with Mixed Mode CD format because data tracks (before the audio tracks) might be "played", resulting in screeching which, at worst, might damage speakers. (This is caused by the player not recognizing the "data" flag bit for the track that distinguished it from an audio track; these players were designed before CD-ROM discs were common, so they could reasonably assume that it would always be coded for an audio track. All newer audio CD players do check the bit and mute the track if it is a data track.) When a CD is created by CD Plus (CD Extra) audio tracks are placed before data, avoiding the problem for most audio players.