[CentOS] [Q} how can O.S. predicate a disk going to failure??

2009/8/4 mcclnx mcc <mcclnx at yahoo.com.tw>:
[snip]
>
> my questions are:
>
> 1. is this disk really "degrade" or not?
>
> 2. how O.S. can predicate disk going to failure?
>
> 3. do I need replace this disk now?

I understand that the drive electronics can check things such as the
time it takes to read a sector, number of failures per read, retries
before success etc.. This information gets processed and reported to
the OS via SMART as some others have replied.

But I really just want to say that within one day of getting SMART
errors, my disk failed.