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Re: ssd / smart question



Glenn English:
>
> SMART Attributes Data Structure revision number: 16
> Vendor Specific SMART Attributes with Thresholds:
> ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
>   1 Raw_Read_Error_Rate     0x0000   007   000   000    Old_age   Offline  In_the_past 0
>   9 Power_On_Hours          0x0000   155   001   000    Old_age   Offline      -       0
>  12 Power_Cycle_Count       0x0000   012   000   000    Old_age   Offline  In_the_past 0
> 184 Unknown_Attribute       0x0000   001   000   000    Old_age   Offline  In_the_past 0
> 195 Hardware_ECC_Recovered  0x0000   000   000   000    Old_age   Offline  FAILING_NOW 0
> 196 Reallocated_Event_Count 0x0000   000   000   000    Old_age   Offline  FAILING_NOW 0
> 197 Current_Pending_Sector  0x0000   000   000   000    Old_age   Offline  FAILING_NOW 0

The question is whether these values have been like this from the start.
I think it is a little bit unusual for the drive to have a threshold of
zero for 195-197. And it makes me suspicious that not even attributes 9
and 12 are counted properly.

> 204 Shock_Count_Write_Opern 0x0000   000   000   000    Old_age   Offline  FAILING_NOW 0
> 206 Flying_Height           0x0000   001   000   000    Old_age   Offline  In_the_past 0

I think both of these values don't matter to SSDs at all. They shouldn't
care about shocks and don't have a head which could "fly high".

Conclusion: While the warnings indicate a broken disk, they look a bit
fishy to me. It looks the manufacturer used standard firmware from a
regular hard drive and didn't adapt it to SSDs properly. For comparison,
here are *all* values my Intel X25m reports via SMART:

ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  3 Spin_Up_Time            0x0000   100   000   000    Old_age   Offline      -       0
  4 Start_Stop_Count        0x0000   100   000   000    Old_age   Offline      -       0
  5 Reallocated_Sector_Ct   0x0002   100   100   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0002   100   100   000    Old_age   Always       -       1703
 12 Power_Cycle_Count       0x0002   100   100   000    Old_age   Always       -       509
192 Power-Off_Retract_Count 0x0002   100   100   000    Old_age   Always       -       445
232 Available_Reservd_Space 0x0003   100   100   010    Pre-fail  Always       -       0
233 Media_Wearout_Indicator 0x0002   097   097   000    Old_age   Always       -       0
225 Load_Cycle_Count        0x0000   200   200   000    Old_age   Offline      -       45681
226 Load-in_Time            0x0002   255   000   000    Old_age   Always       -       0
227 Torq-amp_Count          0x0002   000   000   000    Old_age   Always       -       0
228 Power-off_Retract_Count 0x0002   000   000   000    Old_age   Always       -       0

I think I would try finding and using the manufacturer's diagnostic tool
(which might be a pain without Windows) and see what it reports. I would
expect it to report no problems.


J.
-- 
I am no longer prepared to give you the benefit of the doubt.
[Agree]   [Disagree]
                 <http://www.slowlydownward.com/NODATA/data_enter2.html>

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