Western Digital Power_On_Hours_Count

I notice that the normalised value of Western Digital's 
Power_On_Hours_Count attribute appears to reflect the drive's remaining 
life in months. It begins life with 100 months and then decrements this 
attribute by 1 for each month of run time.

For example, one WD1600AAJS model has a POH count of 56 (= 100 - 44). The 
hours count of 32377 corresponds to 44.35 months. Another drive has 
recorded 33585 hours and a value of 54 (= 100 - 46). Once again the hours 
count corresponds to 46.01 months.


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