Are you using that in Wii U mode or vWii?
Wii U formatted drives are encrypted, only the Wii U can access them normally (there are special tools to read the files though)
WBFS formatted drives for Wii/vWii can be accessed (to add/remove games)...
@K3Nv2 I got some cheapies at wallys, that are pretty good, already have lost a few expensive ones (one falls out and gone, can't find) while cutting grass so bought some cheap ones, and of course never lose these cheap ones. (Cheap meaning only $35, compared to air buds which I only have 1 of 2 now)