The official PSP compressed format—great for compatibility.
While DuckStation and Beetle PSX love CHD files, some 15-year-old emulators (like bleem! or VGS) do not. Always check your emulator’s documentation. Ps1 Highly Compressed Games
where original content (like music or videos) is stripped out to drastically reduce the file size. 1. Compression Formats (Lossless) Modern emulators like DuckStation The official PSP compressed format—great for compatibility