An Emulated Nand can be your USB drive, SD Card, HDD. 32gb should be more than enough for an emulated Nand to download every Wii Ware/Virtual Console game as well as the Wii Menu being able to
Here is my problem. I moved my world 8 NSMB save file from Wii System to the SD card. I left the SD card in the system. When I booted up the game again it created a new save file and I was back at World 1. I exited the game, deleted the new save file from system memory, and moved the old one (world 8) from the sd card back to system memory.

Click on your external hard drive to highlight it. Right-click the highlighted drive, and click “Format.”. Click the “File System” dropdown menu, and then click “FAT.”. Click the “OK” button. Copy/paste your Nintendo Wii game into the newly formatted external hard drive, and wait as the game is transferred over.

Note that you can also use micro SD cards with an adapter, since sometimes micro SD cards are a little cheaper. I'm not sure about the speed or whether it's "enough". If the SD card is pretty old then it's more likely the SD card speed. I think I read somewhere that the max read speed of a wii is comparable to a class 4 or class 6 SD card.
Insert your USB drive, and SD card if you’re using one, into your Wii and launch USB Loader GX from the Homebrew Channel. There is no “guide” to use the USB Loader GX app. This is intended to help you learn how to use it, by giving you a quick start. You should be able to figure out all the great features of USB Loader GX by using it.
alexander1970 said: Hello. Unfortunately no,you can use the NAND (until it is Full as you said) and then an USB HDD for the Games to install. Please note (Because of the "not so good" powersupplied USB Ports from the Wii U) you should use an HDD with Power Adapter and an Y-Cable to Connect it to your Wii U). Thank you.
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how to download free wii games on sd card