Quote Originally Posted by canthearu View Post
Does anyone know a program that correctly decode the Power on Hours?
According to the manual:
The raw value reports two values: the first 4 bytes report the cumulative number of power-on hours over the life of the device,
the remaining bytes report the number of milliseconds since the last hour increment.

That does not seem to mean anything however.

If you run this command with smartctl you will see the true power on hours under the device statistics

smartctl -q noserial -i -l devstat,0 -l devstat /dev/sda

The last letter is a reference to the sata port so you will need to change the value depending on which sata port you are on. The command will only work with the 520& 710. (No other drives support device statistics).