To have units start at boot, try enabling them with Hddtemp:.
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Several Linux distros have access to Hddtemp, a small utility that checks the temperature of a hard drive.
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The sudo systemctl start Hddtemp,
sudo systemctl stop Hddtemp, and sudo systemctl restart Hddtemp commands
produce no output by default when they're successful.
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The output here shows that
Systemd created a symlink to tell itself to start Hddtemp when your computer goes through the boot process.