The Fios G1100 does not support attached USB drives. From the handbook and also from recent forum post: Correct answer: Community Forums - Using an external (USB) hard drive on my network (... - Verizon Community.
USB - provides up to 500 mA at 5 VDC for attached devices.
For example, you could charge a cell phone. In the future, with a
firmware upgrade, the USB host functionality may be available for
other devices, such as external storage and cameras. Firmware
updates are performed automatically by Verizon.
I suggest you create a new post in the Support thread. Follow these instructions: