Did you make sure it was a compatible device?
So i have been following a guide that shows you how to play games from a usb device. I have followed everything and when i plug the device into the wii and click on Usb loader it says "No WBFS or FAT game partition found". I have put the iso for SMG2 in WBMFS manager just like the guide said...and formated the drive.
yes....one of those 500 gb WD ones
Did you format it all as one partition? When you plug into Windows PC does it ask to format the drive? (and you have to press no each time) If you go in to WBFS manager and select the drive and press load does it show the games on the drive?
I've read about a few people having similar problems, they reported that USB loading from neogammer worked, so try installing Neogammer, it's not a pretty interface but should prove that your usb drive is setup correctly. If so try installing a different version of USB Loader GX