Unlike "No-Intro" sets (for cartridges), Redump DATs do not always come with built-in "Parent-Clone" data. Users often rely on third-party tools like Retool to identify which games are versions of each other to effectively apply 1G1R logic.
When browsing your library, you don't see Resident Evil listed five times (US, EU, PAL, Revision A, etc.).
Last updated: 2025 – Based on Redump.org PlayStation DAT files and community 1G1R practices. 1g1r redump sony playstation
A "full set" of PS1 games includes every variation, revision, demo, and localization (e.g., USA v1.0, USA v1.1, Europe, Japan, etc.). This leads to massive storage usage and dozens of duplicates for the same game.
It's also worth understanding how Redump compares to other preservation standards: Unlike "No-Intro" sets (for cartridges), Redump DATs do
Thanks to the work of dozens of dedicated users worldwide, Redump has dat (database entry) over 10,000 unique Sony PlayStation discs. Their coverage of the global PSX library is now estimated to be over 95-98% complete.
: Instead of having "Resident Evil (USA)," "Resident Evil (Europe)," and "Resident Evil (Japan)" all taking up space, a 1G1R set uses a priority system to keep only one version—usually the latest revision from your preferred region (e.g., USA > Europe > Japan). 2. How to Create Your Own 1G1R Set Last updated: 2025 – Based on Redump
Sony’s library is massive. For the original PlayStation (PS1) alone, a full Redump set can exceed and take up nearly 3TB of space. By switching to a 1G1R set, you can: