Hddtemp - UshakovVasilii/gnome-shell-extension-freon GitHub Wiki

For display drive temperature you need install/start/enable "hddtemp" daemon

For display more one disk you need create a customexec.conf file inside adding the drives you want to monitor, e.g.:

/etc/systemd/system/hddtemp.service.d/customexec.conf

[Service]
ExecStart=
ExecStart=/usr/bin/hddtemp -dF /dev/sda /dev/sdb /dev/sdc

# systemctl --system daemon-reload

# systemctl restart hddtemp