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if the "Analyse data field" option is selected as condition calculation method on the advanced options page, the remaining lifetime is calculated by the following method:
By default, the total expected lifetime of a hard disk in perfect condition is defined as 5 years (running every day and night on all days). This is equal to 1825 days in 24/7 mode or 43800 hours.
The elapsed power on time decreases this value.
The result is decreased according the number of days when the temperature was too high. If the maximum (peak) temperature was high, it is not so critical but if the average temperature was too high (it means the temperature was high for longer time) the result is reduced drastically.
The result is multiplied by the square of the health value of the disk.
Note: Hard Disk Sentinel displays 1000 days as maximum value for estimated remaining lifetime. Of course in an ideal situation this value will not decrease even after hundreds of days.
For example: the hard disk is working for 600 days (600 x 24 hours) and its temperature was not too hot (there were no days with too high average temperature) and the health is 70%. The total remaining lifetime is 1225 x 0.7 x 0.7 = 600 days and 6 hours.
As you can see, the health value drastically determines the estimated remaining lifetime of the hard disk. If the health value is low, the remaining lifetime display will remain unchanged for many days, even if the power on time value increases. For example, if the health value is 25% for a hard disk, 16 days needed (assuming the hard disk is working 24 hours daily) to decrease the remaining lifetime with one single day (because 16 x 0.25 x 0.25 = 1).
Note: the estimated remaining lifetime depends on many factors (temperature, health) so it is recommended to perform the steps of the temperature calibration and select the correct condition calculation method based on the actual situation and use the correct offset values for the S.M.A.R.T. attributes if neccessary. Only advanced users should use and modify these options because a wrong combination of settings may result in improper display of some values.