After many years of owning the SBG7400AC2, I recently tried to use the USB port to have a shared folder easily accessible by everyone home for minor things like saving and sharing small files.
I was able to connect a thumbdrive, set up the USB such that everyone access, as detailed on this very helpful page: https://arris.my.salesforce-sites.com/consumers/articles/General_FAQs/SBG7400AC2-USB-Media-Sharing
I have no trouble seeing all the folders on the drive on my macbook and windows computers, however, I am completely unable to write anything to it on my network. Does this modem not permit writing function to the USB drives?