How to disable sdcard access (permanent)

I want to disable a user from using the sd card on his samsung tablet A 2016 (Android 6-7) - SM-T580.
I think the best answer is to find the driver responsible about it & delete it from kernel or system
(I have root permission, no problem with that.)

I have did the same for the camera & found the files & managed to disable it. now when I want to use it back I just make a flash recovery.
Any help please?

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