S.M.A.R.T
From Hack Sphere Labs Wiki
smartctl
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smartctl -a /dev/sda
start tests
smartctl -t long /dev/sda smartctl -t offline /dev/sda smartctl -t short /dev/sda
capabilities
smartctl -c /dev/sda
health
smartctl -H /dev/sda
enable/disable offline data tests (wikipedia says very 4hrs) (smartctl man page says also depreciated)
smartctl -o on/off /dev/sda
GUI
pacman -Sv gsmartcontrol