The tool reads the data from the ROM chip on the cartridge board. Verification:

The Redump SNES project is a crucial component of modern video game preservation, transforming deteriorating physical cartridges into durable, verified digital files. Through the hard work of volunteers who catalog revisions, verify checksums, and document the nuances of cartridge-based storage, the Redump project ensures that the legacy of the 16-bit era remains accessible for future generations, maintaining the integrity of gaming history. redump.org • Main page

Founded with the goal of preserving accurate data from optical media (CDs, DVDs, GD-ROMs), Redump has expanded its scope over the years. The project’s primary mission is to ensure that video game data survives the inevitable decay of physical media. Disc rot is a real phenomenon; chemical reactions within the layers of CDs and DVDs can render them unreadable over time. Redump seeks to create a digital "safety net" by verifying that a digital file is an exact, 1:1 copy of the original disc as it was manufactured.