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PSX PS1 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 List 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 PS1 games (even though it should work for games which are single track). Even running an ISO file based on a PSX PS1 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.* However, a mounted image (Using '''Daemon Tools'''), running from a CD-ROM or using the '''Mooby2''' plugin can solve these CD-DA problems. The mds/mdf format is good for backing up the CD-DA audio-equipped PSX PS1 games, although the best Image format for any PSX PS1 game is the cue/bin format, the reason being that almost all of the burning programs can read it and the relevant patching programs (i.e. '''PPF-O-Matic''') are designed for that format. '''Clone CD''' images in img/ccd format provide another ideal option as it has virtually the same structure as cue/bin format (The img file is the same data as a bin file at the hex level), although the available burning programs are largely not able to read Clone CD's format. '''ISObuster''' and '''ImgBurn''' are good tools for some of the aforementioned notes.<ref name="ECM-APE_Guide">{{cite web|url=https://www.epforums.org/showthread.php?57757-ECM-And-APE-Guide|title=ECM And APE Guide |publisher=www.epforums.org|accessdate=2018-Oct-05|date=2011-Feb-16; Last edited: 2017-Jan-15}}</ref>

* The European regional versions of many PSX PS1 games tended to have a copy protection embedded, so they could cause problems with backing up images in that these game backups could cause hangs or show a black screen infinitely in a typical emulator. A basic way to avoid that problem is to try the US regional versions. Another way is to just run a game backup from a BIN and CUE file format. You can use '''Clone CD''' to make an image in .ccd/.img/.sub format or patch it with a .ppf patch to bypass the protection.

* If running '''ePSXe''' or a similar emulator on an old '''Windows''' OS (Eg. 9x, ME, 2000, XP), use [http://radified.com/ASPI/forceaspi.htm ForceASPI] to initialize the ASPI layer (For your disc drive) and a plugin like '''P.E.Op.S.''' CDR Version 1.4 plugin or similar. Then set the plugin to "W2K/XP IOCTL scsi commands" before running your PSX PS1 CD's.