All other SMART data are zero besides the 5 Reallocated sectors. 

The thing that indicates failure is a GROWING number of r-s counts.  I have a 
couple NASes that track r-s counts and report if they grow.  One here and there 
makes no difference.  I have disks that will get one or two in say a year and 
continue to run fine (some for many many years now).  But if you see them begin 
to creep up over a period of a few days or a few weeks then the disk will 
likely fail.

-Tom

On Jun 18, 2013, at 4:18 PM, Przemek Klosowski <przemek.klosow...@gmail.com> 
wrote:

> On Mon, Jun 17, 2013 at 9:53 AM, Tom Easterday <tom-...@bgp.nu> wrote:
>> File system check claims the disks are fine.  SMART shows 5 reallocated 
>> sectors and everything is good.
> 
> No, it's not. First of all, check if you have Current Pending
> sectors---those are ones that were written to but can't be read back,
> so they can't be retired/reallocated. The firmware recovery for this
> condition usually takes a long time (firmware retries, recalibrates,
> etc), and OS recovery may be flaky. If you have CPS, you need to find
> the sectors and overwrite them, which will allow reallocation.
> 
> Furthermore, Google did a study (
> http://research.google.com/archive/disk_failures.pdf ) showing that
> reallocated sectors are a significant future failure predictors, so
> replace that baby while you can.
> 
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