A homebrew hacker succeeded in connecting a 40GB IDE hard-drive to a Nintendo DS, and he shows you step by step how to do it.
The 40GB storage extension for the Nintendo DS is not very portable - nothing you could not fix with some duct tape though. You need an additional 5V power supply for the HDD as the GBA slot only provides 3.3V. More details on the Natrium42's site. Via MaxConsole.
Datel offers a 4GB HDD for the Nintendo DS that is more integrated. Find Nintendo DS Deals.
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