Hi Strex,
Dear member of SanDisk Community, welcome.
First stage:
Please, check in the manual of the Tab, in the specification section, if it supports 128 GB card with exFAT format.
Also, on the card [MicroSDXC, 128 GB, C10 & U1], check with the PC, capacity and format that shows.
Luck, and then you tell us, what happened, please.
Regards, Alfred. (Google translated)
