This remounts USB in read-only mode.
Create two files
/storage/.config/udev.rules.d/96-enforce-usb-ro.rules
/storage/.config/system.d/enforce-usb-ro\@.service
and reload rules and services or just reboot.
Code
cat >/storage/.config/udev.rules.d/96-enforce-usb-ro.rules <<EOL
SUBSYSTEMS=="usb",ACTION=="add",KERNEL=="sd*",ENV{SYSTEMD_WANTS}="enforce-usb-ro@%k"
EOL
cat >/storage/.config/system.d/enforce-usb-ro\@.service <<EOL
[Unit]
Description=Enforce read-only mode on USB storage device
BindsTo=dev-%i.device
[Service]
Type=simple
ExecStart=/usr/bin/mount -o remount,ro /dev/%I
EOL
udevadm control --reload
systemctl daemon-reload
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