While high hours are not an indication of failure, the odds of a failure are much higher.

GSmartControl can be used in Ubuntu if you cannot read the output from Disks.

Boot your system into a live Ubuntu session. Locate the Disks application and select the suspicious hard drive.

From the drop-down menu, select SMART Data and Self Tests. This will pull up the SMART data.

Locate the following SMART attributes: Power On Hours and Power Cycle Count.