How Many DSi Games Fit on a 4GB SD Card? It Depends on the Games.

No Fixed Number – Sizes Vary Wildly

DSiWare titles range from a few MB (simple puzzles/clocks) to 100MB+ (full games like Mario vs. Donkey Kong: Minis March Again!). DSi-enhanced retail games (if dumped) can exceed 256MB.

Estimation Method

1. List your target games and find their file sizes (e.g., on 3dsdb.com or r/DSiHacks wikis).
2. Assume ~20–30% space savings if compressing to .cia/.nds with tools like GodMode9 or DSiWare Toolkit.
3. Reserve 500MB–1GB for system files, saves, photos, music, and future downloads.

Example Calculation

• Average target game: 80MB (compressed ~60MB).
• 4GB SD card ≈ 3.7GB usable after formatting.
• Reserve 1GB → 2.7GB free.
• 2.7GB / 60MB ≈ 45 games.

If you pick larger titles (150MB+ each), that drops to ~15. If mostly tiny apps (5MB), you could fit hundreds.

Bottom Line

Check the specific file sizes of the games you want. Sum them, add 30% overhead, compare to ~3.5GB usable. That's your answer.