Original PS1 games were distributed on CD-ROMs. When these discs are copied to a computer, they create an identical digital image. Understanding the standard formats helps explain why compression is so valuable. Standard PS1 Dump Formats
There is zero downside in 2025. Modern emulators (DuckStation, SwanStation, PCSX-ReARMed) handle CHD and PBP natively. You will save hundreds of gigabytes, keep your multi-disc games organized in a single file, and experience identical gameplay to the original 1990s discs. Ps1 Roms Highly Compressed