This article will serve as the definitive resource. We will explain what a NAND is, why Dolphin needs it, the legal pitfalls of downloading one, and—most importantly—the safe and legitimate methods to get a Wii NAND for your Dolphin emulator.

The NAND (Not AND) flash memory is the Wii’s internal storage chip. It holds:

Now that you have your legitimate nand.bin file, here is how to make Dolphin use it.

The NUS Downloader tool allows you to manually download specific system titles (like the Wii Menu 4.3U) from Nintendo’s Update Services.

You're looking to download a Wii NAND dump for use with the Dolphin emulator.