Power_On_Hours value is much less then selftest LifeTime(hours)

Hello,

I've recently bought the "new" HDD Hitachi Ultrastar A7K2000 and found
the following in the output of the smartctl (check particularly the
Power_On_Hours and LifeTime(hours)):

ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE     
UPDATED  WHEN_FAILED RAW_VALUE
...
  4 Start_Stop_Count        0x0012   100   100   000    Old_age  
Always       -       2
  5 Reallocated_Sector_Ct   0x0033   100   100   005    Pre-fail 
Always       -       0
  7 Seek_Error_Rate         0x000b   100   100   067    Pre-fail 
Always       -       0
  8 Seek_Time_Performance   0x0005   100   100   020    Pre-fail 
Offline      -       0
  9 Power_On_Hours          0x0012   100   100   000    Old_age  
Always       -       45
...
SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining 
LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%    
36872         -
# 2  Short offline       Completed without error       00%    
36784         -
...

I'd appreciate if somebody could give an explanation of these numbers.


Regards,
Vlad.

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