> >You don't have to guess about failing hard drives. You only have to 
>> read the SMART info from each of your drives. That will tell you.
>
> That is not entirely true. "Desktop" drives will spend a lot of time
trying to relocate data from failing sectors before they consider themselves
failing.


It is completely true. The computer industry has relied on SMART for many
years now. RAID controllers rely on it, for example. 

When a sector is 'reallocated', there's no guarantee the data that the drive
moves to a spare sector is any good. The damage is already done. 

All it takes is one or two bad sectors to destroy the OS or entire
partitions, or you might just have a few files go missing. It's just a
matter of luck. 

That's why it's so important to replace those drives. 




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