/dev/sda -a -d sat -m root -M exec /usr/share/smartmontools/smartd-runner /dev/sdb -a -d sat -m root -M exec /usr/share/smartmontools/smartd-runner
This will bite you if/when you install another disk drive.
You are better off with the 'DEVICESCAN -H -m root' option in place.
Could you be more precise, please. Where exactly would you put this phrase?
/etc/smartd.conf is where this is specified.
-Jason