A quick note from the community: CHD files compress data and convert audio to lossless FLAC, which results in smaller file sizes than other formats like .pbp . Many users report significantly improved storage efficiency. As one guide notes, "the CHD format preserves everything and is much tidier compared to having multiple pairs of scattered files".

If you'd like to optimize your gameplay experience further, let me know:

…has been preserved. In CHD format. With Spanish subtitles. Rev 1.

Metal Gear Solid (Spain) (Disc 1) (Rev 1) CHD: The Definitive Preservation Guide

In the vast, shadowy world of video game preservation, few communities are as obsessive—or as meticulous—as those who collect, verify, and optimize disc-based games for emulation. For the average player, Metal Gear Solid on the original PlayStation is simply a masterpiece of stealth action. For the data hoarder and the retro archivist, it is a labyrinth of regional variants, bug fixes, and serial numbers.

When Hideo Kojima’s Metal Gear Solid launched in 1998, it revolutionized cinematic storytelling in video games. To match its Hollywood-level aspirations, Sony and Konami invested heavily in full regional localizations across Europe. A Legendary Dub

Cultural legacy Beyond manufacturing specifics, regional copies like Spanish pressings represent how global gaming hits were adapted and experienced differently. Spanish players reading localized manuals and on-disc prompts formed part of Metal Gear Solid’s European reception, shaping reviews and fan discourse in that linguistic community. Physical artifacts—cases, manuals, and revisioned discs—serve as tangible evidence of the game’s penetration into diverse markets and the supply-chain realities of late-90s gaming.

This is a "Compressed Hunks of Data" file, a popular lossless compression format used in emulation (like DuckStation) to save space compared to traditional pairs while keeping the data 100% intact. Revision 1 (Rev 1):

The Spanish localization of MGS1 is widely regarded as one of the finest dubbing jobs in the history of European video games. Alfonso Vallés provided the voice for Solid Snake, delivering a gravelly, hard-boiled performance that rivaled David Hayter’s English portrayal. Finding the right file ensures you experience Vallés' legendary delivery of lines alongside an excellent cast supporting characters like Colonel Campbell and Psycho Mantis. 2. Elimination of Soft-Locks

: Resolved rare game-crashing bugs during heavy scripted sequences. Text & Translation

The format was originally created by the MAME development team and has since become the gold standard for disc-based console emulation. 1. Massive Storage Savings

"Rev 1" indicates a revision of the game disc's master code. In the late 1990s, Sony used incremental revision numbers on PlayStation CDs (often visible in the disc’s serial code, e.g., SLES-01376, with the revision indicated by a small mark near the inner ring or in mastering data). A Rev 1 suggests this disc was pressed after the original retail release (Rev 0) to address:

: This part suggests a specific version or release of the game tailored for Spain, indicated by "Spain" or possibly a Spanish version of the game. "Disc 1" implies it's part of a collection or a multi-disc game release. "Rev 1CHD" could indicate a revision level or a specific encoding or compression (CHD - Compressed Hunk of Data, a format used for storing CD-ROM data in a compressed form).

Unlike the NTSC (USA/Japan) versions, the Spanish PAL version features fully localized voice acting. Metal Gear Speedrunners Revision 1 Changes:

Like other PAL versions, it runs at 50Hz, which is slightly slower than the 60Hz NTSC versions (USA/Japan), resulting in minor gameplay timing differences often discussed by the speedrunning community.

To understand why this specific file is so sought after in the emulation community, it helps to break down the file string nomenclature used by preservation groups like Redump.org :