| Feature | | Split | Fully Merged | | :--- | :--- | :--- | :--- | | Parent ROM | Complete (all files) | Complete (all files) | Contains parent + all clones inside one ZIP | | Clone ROM | Complete (all files) | Contains only unique files; requires parent | Does not exist as separate ZIP; inside parent | | File Duplication | High (files repeat across clones) | Minimal (files stored once) | None (only one archive) | | Ease of Use | Very easy (drag & drop any game) | Moderate (must keep parent + clone) | Complex (needs special tools to extract single game) | | Hard Drive Space | High (largest size) | Low (most efficient) | Medium (can be inefficient if updating) | | Best For | Casual users, frontends, single-game setups | Archiving, bandwidth saving, collectors | Complete set preservationists |
Most ROM sets "split" these files to save space, meaning a clone ZIP file won't work unless the parent ZIP is also in the folder. The Solution: Non-Merged set contains absolutely everything a game needs to run inside a single ZIP file non merged mame rom set