Re: [Smartmontools-support]Power_On_Hours decreases too fast

[Bruce A. <ba...@gr...>]

> > >   9 Power_On_Hours          0x0012   001   001   000    Old_age   Always       -       877
> > >  12 Power_Cycle_Count       0x0013   100   100   000    Pre-fail  Always       -       10
> > > 
> > > Nothing happened at 5:44 pm. :-) 
> > 
> > OK!
> > 
> > Strange through -- I wonder if the design life for the disk is 880
> > hours.  They must have had some reason to pick that decay rate for the
> > normalized value.
> 
> This drive was working in a personal video recorder since June 2000. Could it be
> that, despite SMART being off for the 2.5 years before I took it out,
> it was counting the power-on time somewhere (or, maybe, updating 
> coefficients of the normalization formula)?

Yes, the ATA-7 spec says the following for SMART DISABLE:

"This command disables all SMART capabilities within the device including
any and all timer and event count functions related exclusively to this
feature. After command acceptance the device shall disable all SMART
operations. SMART data shall no longer be monitored or saved by the
device. The state of SMART, either enabled or disabled, shall be preserved
by the device across power cycles."

Note the word "exclusively".  So the timer was probably working, assuming
that you had the unit powered off when not in use.

Another subject: how about translating those nice descriptions of the
different Attributes, to put on the web page?

Cheers,
	Bruce