Re: SSD's Power_On_Hours issues

Opty wrote:
> Hello!
>
> Shortly:
>
> (1) Transcend SSD370S 128 GB: After power-on, Power_On_Hours doesn't
> increase until I run offline test.
>
> (2) ADATA Premier Pro SP920 128 GB: After unexpected power loss,
> Power_On_Hours reset to 0 (zero). Also when on, Power_On_Hours
> increase faster than real time clock (4 hours in S.M.A.R.T. vs. 3,75
> hours actually).
>
> (3) Kingston SSDNow KC400 128 GB: After unexpected power loss,
> Power_On_Hours reset to 0 (zero).

Thanks for the info.


> Any ideas?

This are drive firmware issues which cannot be fixed by smartmontools. 
Allowed by ATA standards because the attribute table in the SMART DATA 
block is declared as 'vendor specific' since ATA-4 (1998).

Please check whether these drives support ATA Device Statistics 
(smartctl -l devstat, included in -x). If yes, its Power on Hours count 
may be more reliable.


Thanks,
Christian


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