Following Quick Start for Adding a USB drive but installing some packages that will be needed right after. Also see Using storage devices.
- SSH into the router.
- Install required packages...
opkg update
opkg install block-mount e2fsprogs kmod-fs-ext4 kmod-usb-ohci kmod-usb-storage kmod-usb-uhci kmod-usb2 kmod-usb3 usbutils nano