What is the unit of `Power_On_Hours` in `smartctl`?
SMART Monitoring Tools

The smartctl tool claims hours, so that suggests one or more of the following:


A fault in the tool;
A fault in your drive reporting firmware;
Or that your drive was only active for six hours during that period.


Drives will power up and down whenever they can to save energy. Six hours of storage access may not be unrealistic but it all depends on how the computer is used.

Try using the -v flag to customise the output. You can specify times in minutes or other units. This may give a better insight into the reported values.

If you need help using and understand the results of smartctl, please contact the developers. They are best placed to provide authoritative answers.