You need an installer homebrew app. The standard is TinWoo or Awoo Installer.
The "Eternal Collection" is a massive game. Understanding its storage footprint is the first step in managing the file.
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One of the most common issues users encounter when trying to install Diablo III via traditional methods (like an SD card formatted to FAT32) is the 4GB file size limit.
The base Diablo III: Eternal Collection NSP is approximately 12.5 GB to 13.4 GB, depending on the region and whether the dump includes day-one patches. Because the NSP exceeds 4GB, it is considered a "split NSP." When downloading from various sources, users will often see the file split into .part1, .part2, and .part3 archives (usually 4GB or 4.7GB each). You need an installer homebrew app
Why this matters: If you attempt to copy a single 13GB NSP file directly to a FAT32 SD card without splitting or using USB installation tools (like Awoo Installer or DBI), the transfer will fail. Switch modding communities have established that the Diablo III NSP sits right at the upper limit of single-layer cartridge storage, which is why Blizzard used a 16GB cartridge for the physical release.
The Nintendo Switch uses eMMC storage, which requires free space for system operations (over-provisioning). One of the most common issues users encounter
Official Nintendo cartridges and digital downloads often contain "padding" (dummy data) to fill the storage blocks or to optimize read speeds. A standard NSP file dumped from a cartridge or eShop often contains this padding.
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