Confirmed the problem, MythTV was trying to access the NAS storage because it has the largest free space, which I had it set as (Read only),
I tried to use "Storage group" from Backend setup, no luck
I tried to edit "/usr/pluto/bin/mythtv_setup.pl", no luck
I couldn't find a way in MythWeb.
Does anyone know how to force MythTV to use specific hard drive for Live TV and Storage???