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We went on a 7 year, 50 state road trip... and beyond

| Format | Tool | Typical Ratio | Common Issues When "Over-Compressed" | |--------|------|---------------|----------------------------------------| | | PSX2PSP, Popstation | 40–60% | Stuttering music, missing audio channels, freeze on FMV | | CSO (CISO) | CISO tool | 30–50% | Slow loading, random crashes on real PSP | | CHD | chdman | 30–40% (lossless) | No issues if lossless; lossy CHD is rare | | 7z + BIN | 7-Zip | 50–70% | Requires extraction; not playable directly | | ECM (Error Code Modeler) | ecm tool | 5–10% extra | Only removes EDC/ECC; not enough alone |

Frustrated, Vincent dug deeper. He found a forum post from a user named . The post was short:

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To avoid headaches, move away from highly compressed games that modify the internal data of the disc. Instead, download clean, full-sized game dumps and compress them yourself into the .CHD or .PBP format. This gives you the best of both worlds: tiny file sizes and fixed, flawless performance.

: Originally for playing PS1 games on PSP. It supports multi-disc games in a single file and is compatible with most modern emulators like DuckStation or RetroArch.

I can provide step-by-step instructions to get your specific game running. Share public link

If you want to keep your file sizes small but eliminate the bugs associated with raw highly compressed rips, convert your games to the format. CHD is the gold standard for retro emulation because it offers excellent compression without breaking game logic or removing audio tracks.

The Ultimate Guide to PS1 Highly Compressed Games: How to Find, Fix, and Run Them

PS1 games originally came on CDs, which held roughly 650MB to 700MB of data. A standard ROM file (ISO or BIN) is an exact copy of that disc. If you have a library of 50 games, you are looking at 30GB+ of storage space.