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The rarest "CHD PSX ROMs Exclusive" files are pre-patched, pre-compressed versions of fan-translated Japanese games. For example, Policenauts (English patch) or Tales of Phantasia (fully dubbed). The "exclusive" claim sticks because the patcher had to convert the original BIN to CHD without breaking the patch's integrity—a process many casual users fail at.
You can fit nearly double the games on your SD card or hard drive compared to uncompressed formats. Lossless Compression:
: The format stores metadata that helps emulators and scraping tools (like RetroAchievements ) accurately identify the game. Critical PSX Exclusives for Archiving
: Many users use .bat files to convert entire libraries automatically.
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