Workaround: you can comment out all uncommented lines in '/etc/smartd.conf', and smartd will exit after starting, without even touching any drives.
--- syslog --- Sep 7 12:34:56 Computer1 systemd[1]: Started Self Monitoring and Reporting Technology (SMART) Daemon. Sep 7 12:34:56 Computer1 smartd[2345]: smartd 6.6 2016-05-31 r4324 [x86_64-linux-4.15.0-3-amd64] (local build) Sep 7 12:34:56 Computer1 smartd[2345]: Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org Sep 7 12:34:56 Computer1 smartd[2345]: Opened configuration file /etc/smartd.conf Sep 7 12:34:56 Computer1 smartd[2345]: Configuration file /etc/smartd.conf parsed but has no entries Sep 7 12:34:56 Computer1 smartd[2345]: Unable to monitor any SMART enabled devices. Try debug (-d) option. Exiting... Sep 7 12:34:56 Computer1 systemd[1]: smartd.service: Main process exited, code=exited, status=17/n/a Sep 7 12:34:56 Computer1 systemd[1]: smartd.service: Failed with result 'exit-code'. --- -- Best wishes, Bob