I tried with USB first, then SD and it worked. Had nothing else on the SD card, and nothing present on the USB drive that could have caused problems. I still had the USB drive hooked up when using SD.
Replacing my Wii with the Wii U...getting cluttered. Hating the lack of Cube ports though...
I'm using the tools in the tutorial link and I can't select anything but d2x v3-v6, v10 doesn't show up at all. The v10 folder is there, but they're not showing up.
Edit: I was running the installer from my USB drive, once I ran it from SD it worked.
@The Real Jdbye, I thought about that and I have blank DVD's and Blurays but honestly after like 90 songs I just listen to it a couple of hundred times toss it out and burn something else or have like 2-3 CD's. Florida here the heat in the car tends to ruin the CD's after like a few months even commercial pressed ones don't last too long.