J. P. Gilliver (John) said:
You could have at least tried to look at the SMART stats,
to see how bad it is. Look for "Reallocated Sector Count"
and "Current Pending Sectors". A non-zero Data field for
those, is generally a bad sign. HDTune can read out SMART,
via the "Health" tab.
http://www.hdtune.com/files/hdtune_255.exe
Paul
"Reallocated Sector Count" (and possibly the other one) seems to be
interpreted different ways by different utilities, and/or used
differently by different manufacturers. I don't have hdtune (or don't
think I have), but I have two other utilities.
Seagate's SeaTools for Windows, under Basic Tests, includes "S.M.A.R.T
Check", which tells me "Congratulations, your Seagate product has passed
an important diagnostic test", and its log file shows that I've run
SMART a few times since 2012, as well as other tests it offers - Short
DST, Short Generic, and Long Generic (which looks to have taken just
under an hour - and not get any longer, 56'29" both times - both times I
ran it, 2012-2-25 and 2012-5-2). It doesn't give any details of the
SMART test other than Pass - fair enough, considering it isn't a Seagate
drive! (Unless they include Samsung, which it is.)
DiscCheckupV3.0 (
http://www.passmark.com/products/diskcheckup.htm, now
at 3.1 I see) lists assorted parameters, with status, value, worst,
threshold, raw value, and predicted TEC Date. This last is shown as N.A.
for all parameters except Reallocated Sector Count, presumably because
the others all (other than Temperature) have the same value under Value
(which I take to mean what it's just been read as) as under Worst.
For "5 Reallocated Sector Count", it shows Status: OK (as it does for
everything else), Value: 94, Worst: 94, Threshold: 10, Raw Value: 59,
Predicted TEC Date: 10 Jul 2072 20:44:11. For "C5 Current Pending
Sector Count", it shows OK, 252, 252, 0, 0, and N.A.
It also has a "SMART History" tag, where I can examine what all the
parameters were for all the times I've run it in the past (it says
Records Found 22, presumably meaning I've run it that many times
including just now). For RS Count, it shows a "Value" and "Worst" of
(both) 98 on 16 occasions from 2010-7-15 to 2010-9-19, and (both) 94 on
6 occasions from 2012-3-24 to today; for CPS Count, it shows Value and
Worst of 252 on all 22 occasions.
From this, I deduce that RS Count is something that this utility is
expecting to go _down_ as things deteriorate, with the threshold of 0
supporting this. Actually, clicking on Help takes me to an excellent
(HTML-based; it's on my disc, otherwise I'd give a link) help section,
which tells me that item 5 "Represents the amount of spare sector pool
available."[/QUOTE]
This is a sequence of values from a disk in declining health.
As recorded in HDTune.
It implies the "total available health" is around (100/100-98)*104 = 5000
Of which at this point, the disk has used up 104 of the 5000 maximum
allowed.
Current Worst Threshold Data Status
Reallocated Sector Count 100 100 36 0 OK
Reallocated Sector Count 100 100 36 57 OK
Reallocated Sector Count 98 98 36 104 OK
And that is not a "honest" indicator. The disk manufacturer does
not want customers receiving a new disk, and seeing a non-zero "Data"
value. So, the value is actually thresholded in some way. The disk
has a growing error count, but nothing shows in Data. Then, one day,
you start to see counts there, meaning you're just past the
threshold. Health seems to go downhill fast. And it could be just
the nature of the thresholding that makes it seem that way.
In any case, none of the drives I've caught, showing a count,
have died on me yet. So swapping out the drive when it
starts to indicate a problem, seems to head off a disaster
in time. Your mileage may vary of course.
My experience with the Maxtor was, death occurred soon after
symptoms (same day). But back in that era, I wasn't using SMART,
so I have no idea if "Reallocated" had been giving any warning or
not.
According to official study, SMART isn't that good at catching
stuff in time. So don't rely on studious usage of SMART
as a substitute for doing backups! I.e. Don't wait until
reallocated shows 98% health, before you do your first
backup. You should be doing the backups all along, as disks
do die without any prior warning in SMART. Seeing as some
failures are traceable to data structure corruption, not
all the failures are media (dirty platter) related.
Paul