If you create ISO backups of your games to play on custom firmware (CFW) or PS3HEN, these files are necessary to ensure the dump isn't corrupted [1].
While IRD files themselves are tiny, keeping them organized requires management. Conclusion PS3 IRD Files.rar
If you are looking for specific IRD files, I can try to help you find them, or I can tell you more about the tools used for: Creating custom firmware (CFW) backups Fixing corrupted game dumps If you create ISO backups of your games
IRD files are used to verify that a PS3 ISO dump is identical to the original disc. They allow software like 3DumpStation or ISO Tools to patch, decrypt, and fix ISO files, ensuring they are "stealth" (safe for PSN usage) and accurate. Pros They allow software like 3DumpStation or ISO Tools
Such archives (often found in ".rar" format) usually aim to cover the entire PS3 library, covering regional variations (US, EU, JP).
If you are looking to verify, patch, or secure your PS3 game backups, a comprehensive "PS3 IRD Files.rar" is a mandatory tool. It is the gold standard for creating valid, playable ISOs for custom firmware users.