Step-by-Step Guide: Splitting Files with a ROM / File Chopper

A ROM or File Chopper (splitter) is a software utility used to cut a single, large game file into smaller segments. This technique is primarily used in retro gaming and console homebrew to bypass the strict 4 GB file size limit of the FAT32 file system. While older modded systems require FAT32 for compatibility, it cannot natively store individual files larger than 4 GB. Splitting allows you to transfer large games via a USB drive or SD card and reassemble them on the console. Key Concepts & Formats

Different gaming consoles require specific tools because they handle split files differently:

PlayStation 3 (.pkg / ISO / Folder): Games over 4 GB are chopped into segments labeled .66600, .66601, etc. Homebrew managers like multiMAN automatically detect and merge these when copying them to the internal hard drive.

Nintendo Wii (.wbfs): Large Wii games (like Super Smash Bros. Brawl) are split into .wbfs and .wbf1 segments.

Nintendo Switch (.nsp / .xci): Custom tools split these into a folder containing parts (00, 01) so the Switch’s custom firmware can read them sequentially. Step-by-Step Scenarios for Popular Consoles Scenario A: Splitting PlayStation 3 Games