So this looks like a for a dumped and compressed Spanish MGS1 Disc 1 (Rev 1) into CHD format — likely part of a ROM preservation set or personal backup.

"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:

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.

This article is for educational and preservation purposes. You should own an original physical copy of Metal Gear Solid (PAL Spain, Disc 1, Rev 1) before downloading or creating a CHD file. Distribution of copyrighted material is illegal.

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