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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.io] (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.* 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 games, although the best Image format for any PSX 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 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.::The perfect solution possible, at least for the '''ePSXe''' emulator (and perhaps other similar plugins-based emulators) would be (No virtual drive mounting needed):::1. Use '''Mooby2 2.8''' cdrom plugin, uncheck 'subchannel reading' in the settings of that plugin.::(Just in case: also make sure 'repeat all cdda' is checked, and 'cdda volume' is set to something like 50 or 60. Or else you won't hear anything.)::2. Launch the game with File -> Run CDrom (browse, find and select your cd image as the window pops up.)::Recommended to use '''Eternal 1.41''' sound plugin with default settings along with this. '''SaPu''' CDRom Plugin v.1.0/1.3 is good if running official CDs (Especially works well with '''Daemon Tools Lite''' or '''Alcohol 120%''' when mounting an image). * 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 CD's. <!-- Much of these notes on the troubleshooting and issues for CD images were based off collections of information at www.epforums.org and www.ngemu.com's threads -->