The BIOS setting merely controls whether
the BIOS will test the SMART health status of a disc at bootup.
http://smartmontools.sourceforge.net/
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My computer's BIOS has a SMART enable/disable setting. What does it
do, and how should I set it?
Some type of BIOS can check the SMART health status of a disk at
bootup ... This one-time check on bootup is done if the BIOS SMART
setting is set to 'ENABLE', and is not done if the setting is set to
'DISABLE'.
If this one-time check is done, and the disk's health status is found
to be 'FAIL', then typically the BIOS will display an error message
and refuse to boot the machine.
For the proper functioning of smartmontools [or any other SMART
software tool], either BIOS setting may be used.
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- Franc Zabkar