European PS1 games like Final Fantasy VII use LibCrypt protection, which can cause CHD files to fail if the subchannel data was not correctly included during conversion.

Disc 1 is the largest in the set, packed with approximately 712MB of data. A CHD conversion can reduce this size by roughly 20-30% without any loss of quality, which is critical for retro handheld users (like those on Multi-Disc Management: The "fix" for modern emulation involves using an .m3u playlist file

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To understand the "CHD fix," you must first understand the original sin. When Sony Computer Entertainment Europe (SCEE) localized Final Fantasy VII in late 1997, they faced a challenge: converting the game from 60Hz (NTSC) to 50Hz (PAL).

"The Pal version bleeds. Not frames. Memory. This fix binds the wound. Apply to disc 1 CHD. Run on real PAL console or compatible emu. Do not ask how it works. It just does. The clocks, they drift slower here. This fixes the soul, not the speed."