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===CD format===
PSX games use the CD-ROM XA (eXtended Architecture) format which is based on CDi and allows developers to use both CD-ROM and CD-DA (audio) tracks on the same disc.<ref name="PSX_CD-DA_CDs">[https://ipfs.io/ipfs/QmXoypizjW3WknFiJnKLwHCnL72vedxjQkDDP1mXWo6uco/wiki/List_of_PlayStation_games_with_CD_audio_tracks.html IPFS.ioList of PlayStation games with CD-DA] (From deprecated Wikipedia article - dated 11/27/2016)</ref>
Certain image formats and CD dumping methods don't support this format correctly and end up with the CD-DA tracks missing or corrupted, hence no audio. The ISO format in particular only stores the content of a CD-ROM filesystem and cannot store CD-DA tracks at all so it's generally a very bad idea to use ISO for PSX games (even though it should work for games which are single track). Even running an ISO file based on a PSX game (i.e. ''Ridge Racer, Tomb Raider 1-2'') with CD-DA audio may often cause an emulator such as '''ePSXe''' and other peers to freeze and/or hang up, especially during loading of a saved data or in-game levels and transactions.
