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Is there a table of how to interpret the SMART attribute "power on hours" depending on the HDD manufacturer? Some of them use hours, some minutes or even seconds...

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Good question indeed. I wonder why someone has down-voted it! –  Lorenzo Jan 29 at 15:00
    
I've never seen a drive that used anything other than hours to represent "power on hours"...do you have an example? For instance I have an SSD that stores power on time in milliseconds, but it also says that it does. –  Michael Hampton Jan 31 at 12:11

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up vote 2 down vote accepted

See this FAQ answer from the Smartmontools project:

http://sourceforge.net/apps/trac/smartmontools/wiki/FAQ#Iseesomestrangeoutputfromsmartctl.Whatdoesitmean

There are links there to vendor specific pages which may provide you with the information you're looking for.

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