Hello All.
Some time ago discovered exidently that one of my HDDs show S.M.A.R.T alarm with KillDisck(free version) software, I started to deap what is this mean and found this page where can discover what parameters are realy mater and show that disck can die soon.
https://en.wikipedia.org/wiki/S.M.A.R.T.
So I sujjest all SNO time to time check S.M.A.R.T parameters to discover if HDD start to die.