Hardware Will the Wii U format both Partitions of my Flash Drive?

[UltraArceus3]

I have a 128GB Flash Drive, and I want to use it for my Wii U for extra storage. Now, obviously, the Wii U will format my Flash Drive, leaving it unable to be used by other devices... So, I created 2 Partitions for the Flash Drive, one Mainly for the Wii U & one for my own uses (Possibly for USB Loader GX for vWii...). But, will the Wii U format the ENTIRE FlashDrive, or one of the partitions?

If it'll format the entire drive, what do I do?

Thanks.

 

[godreborn]

I'm pretty sure it formats the entire drive. there's no way to partition it.