I guess it's something you wiped off when you formatted your drive. If you haven't changed your wii, then leave it alone, Did you not save the root files from your drive, pre format. When you run a HDD you normally have GX or CFG files on either a separate partition if you use WBFS manager and GX.. Or everything is on the root of a fat32 drive with just a wbfs folder with your games in, Try to remember what was on the First page when you opened drive with PC.
If You get your drive sorted, Buy another one, put the root files on it then load games, I have three 250gb portables I use, One for my grandkids One for the misses, And One with MY games on, All set up using my saved "root files" a folder called WBFS with the games in I use wii game manager to move wbfs files around on PC. If you should happen to kill one drive you don't lose everything, Plus I find wii struggles to find a 1 or 2 TB drive. It has to read a lot of info all the time to find maybe 1 game
wii fit plus file size 1.93gb
Hey you could always use WBFS manager to formatt the drive to WBFS, I'm sure once you have partitioned drive. you open WBFS manager, click on "your Drive " it asks if you want to formatt, to WBFS click yes.