Use tools like chdman to convert files to .chd . This ensures you have a clean, working copy that takes up 30-50% less space. If you'd like to try this yourself, I can help you: Find the best tools to compress your own PS1 library.
Finding high-quality, pre-compressed files is key. Here are the most reputable, community-vetted sources: Archive.org Psx Highly Compressed Roms
Avoid ROMs labeled as "High Compression Rips" that claim to shrink a 600MB game to 10MB. These almost always remove the music and videos, leaving you with a hollow, buggy version of the game. specific emulators work best with CHD files for your particular device? Use tools like chdman to convert files to