I was pulling my hair out trying to figure out why a USB HD would not mount on this Wii I was setting up. I could see it getting activity and sometimes USB Loader GX would read it. CFG USB Loader, snes9xgx, fceultragx, etc would never load it though. As a last ditched effort I downloaded MiniTool Partition Wizard to take a look at it and try formatting it with that. I had been using "guiformat" up until this point to format and make it fat32. However, that doesn't seem to care about the partition structure. As soon as I saw that it was a GPT disk in MiniTool, I was like... YES!!@# Sure enough, changed it to MBR, formatted fat32, reloaded everything on it and now it mounts every time. Wasn't sure the best place to post this as it's not loader specific and there are a ton of "usb mounting" issue threads. Of all the threads and guides I've read, I don't think I've seen anyone mention to check the partitioning structure. I just happened to notice it.