Thanks. I do use UStealth but I thought there was another issue, I'm mistaken.you can have both conencted, but your Wii HDD must be set as hidden using U Stealth
https://gbatemp.net/threads/ustealth-wii-u-format-disk-nag-workaround.352786/
I will take a closer look at this now. And a big thanks as well to Fix94 for all your hard and excellent work!
Both of my external HDDs are powered so is there any issue using a nonpowered USB hub? I just ordered a LAN adapter finally and want to keep the front ports free for GC controllers.