After installing "USB disk check at boot" and activating it for the USB partition, upon restarting the router, the USB drive was successfully mounted automatically. However, due to some peculiar reason, I formatted the USB drive. When I attempted to reinstall "USB disk check at boot," it had transformed into 'Disk check script.' Even though the activation status showed "The following exclusions are active:"
/dev/sda1 mounted as /tmp/mnt/sda1 UUID="578285f8-a29a-6447-afa3-97f07c805381"
/dev/sda2 mounted as /tmp/mnt/SD
/tmp/mnt/sda2 UUID="0B76071D0B76071D"", after the router was rebooted, the USB drive no longer mounted automatically.
/dev/sda1 mounted as /tmp/mnt/sda1 UUID="578285f8-a29a-6447-afa3-97f07c805381"
/dev/sda2 mounted as /tmp/mnt/SD
/tmp/mnt/sda2 UUID="0B76071D0B76071D"", after the router was rebooted, the USB drive no longer mounted automatically.