[Unit]
Description=Launches "/home/koichirose/scripts/full_backup" when the WD drive is plugged in
Requires=media-koichirose-external.mount
After=media-koichirose-external.mount

[Service]
ExecStart=/home/koichirose/scripts/full_backup

[Install]
WantedBy=media-koichirose-external.mount