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The DAT file is the Rosetta Stone of the archive. It is a text database containing the serial numbers, version numbers, and crucially, the of every verified PS2 disc in existence.
A bad dump is useless to history. It’s corrupted data. ps2 redump archive
The "Archive" usually refers to curated collections found on the or private preservation mirrors. These are typically organized by: Region: (USA), (Europe), (Japan). Disc Type: DVD vs. CD. Version: 1.00, 1.01, or "Greatest Hits" editions. File Formats ISO: The standard format for DVD-based PS2 games. The DAT file is the Rosetta Stone of the archive