From: Franc Zabkar <fzabkar@in...> - 2010-05-13 23:58:03
The raw value of Seek_Error_Rate is indicating that the drive has
recorded 0 errors in 1514487 seeks, ie a perfect score.
The normalised value is calculated as follows:
normalised SER = -10 log(total errors / total seeks)
If errors = 0, then let errors = 1.
So SER = -10 log(1 / 1514487) = 61.8
The raw value of Raw_Read_Error_Rate is a sector count, not an error
count. AIUI, the drive records the total number of read errors in 250
million sectors, and then adjusts the normalised value accordingly. I
don't how the Hardware_ECC_Recovered value is calculated, but its raw
value also appears to be a sector count.
>Vendor Specific SMART Attributes with Thresholds:
>ID# ATTRIBUTE_NAME FLAG VAL WRST TH TYPE UPDATED RAW_VALUE
> 1 Raw_Read_Error_Rate 0f 110 100 06 Pre-fai Always 26841827
> 7 Seek_Error_Rate 0f 061 060 30 Pre-fai Always 1514487
>195 Hardware_ECC_Recovered 1a 034 032 00 Old_age Always 26841827
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