USB, G:\is not accessible Access Denied

unplug your USB

Go to run and type this


gpedit.msc

Navigate to computer configuration - Administrative Templates-System, and then select Removable Storage Access in the left column

on the right side

you may find something like


Removable Disks: Deny execute access,deny write,deny read access,
all removable storage deny

open them and disable all these four options.

Plug in your USB ,it should work now.