Solved

differences between HDD Sentinel and S.M.A.R.T. readings

Posted on 2010-08-16
12
667 Views
Last Modified: 2013-12-01
I have a hard drive that had some data issues. I was looking at it with a S.M.A.R.T. program and it did not register anything wrong with it. However it looked like the readings were either maxed out in a bad way or not reading at all. But it gave it a clean bill of health.

I then used HDD Sentinel and it rated the drive with a 13% health rating. I believe this as the HDD has had failures.

Why are these readings so different between 2 pieces of software with the same data. I will post the pictures that I took of the readings later tonight or tomorrow to clear up the readings that I saw.

0
Comment
Question by:ryan80
  • 4
  • 3
  • 3
  • +2
12 Comments
 
LVL 8

Expert Comment

by:bpinning
ID: 33451663
Hey,

"The software (Sentinel) monitors hard disk drive / HDD status, including health, temperature and all S.M.A.R.T. (Self-Monitoring, Analysis and Reporting Technology, built in most hard disks and solid state disks today) values for each disks. Also it measures the disk transfer speed in real time which can be used as a benchmark or to detect possible hard disk failures, performance degradations."

So it may be because the sentinal does a lot more work on the drive to work out its performance and errors, not just looking at the smart status. "The SMART monitoring technology can predict HDD failure by examining the critical values of the disk drive."

How SMART works, http://www.hdsentinel.com/smart/index.php
0
 
LVL 92

Expert Comment

by:nobus
ID: 33452229
most disk diagnostics will read the smart data :  http://hard.software.informer.com/download-hard-disk-smart-reader/
0
 
LVL 12

Author Comment

by:ryan80
ID: 33455695
I have attached some photoes of the SMART and Sentinel results. It is hard to see the Sentinel results, but it says 13% for the top drive.

All of the SMART seems to say that it is 100%, but I am wondering if I am reading it wrong or something looks off.
SNC00076.jpg
SNC00077.jpg
SNC00078.jpg
0
3 Use Cases for Connected Systems

Our Dev teams are like yours. They’re continually cranking out code for new features/bugs fixes, testing, deploying, testing some more, responding to production monitoring events and more. It’s complex. So, we thought you’d like to see what’s working for us.

 
LVL 63

Expert Comment

by:SysExpert
ID: 33456077
I would also check with HDDtune, since it gives a little better explanation and has read tests as well.

Vendor diagnostics on UBCD


 UBCD Free with Disk tests and Vendor utilities
www.ultimatebootcd.com
 
I hope this helps !

0
 
LVL 12

Author Comment

by:ryan80
ID: 33456666
any ideas on the SMART results?
0
 
LVL 63

Accepted Solution

by:
SysExpert earned 250 total points
ID: 33456801
Some programs do a better job of interpreting SMART than others.

I use vendor Diags, since I would think the Vendor would know best.

I would take at look at HDDtune

http://www.hdtune.com/download.html
0
 
LVL 11

Expert Comment

by:ocanada_techguy
ID: 33457490
Well, for one, it seems the drive has been running for the equivalent of 4.8 years of continuous operation.  Drives have MTBF values and you may be exceeding yours.

But really, to the heart of your question, is that s.m.a.r.t "thresholds" are manufacturer and model variant, very "loosey goosey", and moreover, for every one that shows a threshold of 0 zero, that's NOT really the pass/fail threshold at zero, it just means the manufacturer chooses not to "set" one for the purposes of the s.m.a.r.t. bios checking raising the red flag "do not pass go", in other words zero means it's not set, the manufacturer's diagnostics for the model is more likely to tell you the health.

Clearly HDDSentinel is aware of the shortcomings of s.m.a.r.t. and is interpreting the metrics kept by the drive, perhaps other manufacturer metrics, or maybe just judging based on raw and worst values of s.m.a.r.t or some combination, considers what would be judged acceptable values and reporting accordingly.

Check it out http://www.passmark.com/forum/showthread.php?t=1723
0
 
LVL 12

Author Comment

by:ryan80
ID: 33476594
One more question so I can better understand the SMART results. In the 1st picture I have the first line is:


                                           ID            Threshold         Value              Indicator           1/month        TEC
Raw Read Error Rate          1                   16                   100                                           0.0        Unknown

Now this means that the threshold is set to 16, so anything above that is bad?

The value is 100% so that means that it is 100% read error rate?

The indicator seems to say that things are cheery even though there is 100% failure. Is this correct?

what does the 1/month mean?

what is TEC?
0
 
LVL 63

Expert Comment

by:SysExpert
ID: 33476802
I think the valus is a count not a percentage.

this means that you have had 100 errors on RAW reads, and the threshold is only 16

This drive looks to be on it's last legs...

Did you try HDDTune ?

0
 
LVL 12

Author Comment

by:ryan80
ID: 33476870
No I didnt try HDD Tune. Is that a bootable utility or does it need to be loaded in an OS?
0
 
LVL 11

Assisted Solution

by:ocanada_techguy
ocanada_techguy earned 250 total points
ID: 33479058
Nope, and nope not raw count either.  Quoting from the first paragraph of the passmark forum post I referred you to: "According to what I've read, SMART attribute values can range from 1-253, with 1 meaning bad and 253 being the best possible value"  and http://en.wikipedia.org/wiki/S.M.A.R.T. in the thread's 1st reply.
0
 
LVL 11

Expert Comment

by:ocanada_techguy
ID: 33479089
As you can see from http://en.wikipedia.org/wiki/S.M.A.R.T. in some cases higher is better and in some lower is better, in some it's a raw number but MOSTLY each is a representative scale value
0

Featured Post

NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Facing problems with you memory card? Cannot access your memory card? All stored data, images, videos are lost? If these are your questions...than this small article might help you out in retrieving your lost or inaccessible data.
When we purchase storage, we typically are advertised storage of 500GB, 1TB, 2TB and so on. However, when you actually install it into your computer, your 500GB HDD will actually show up as 465GB. Why? It has to do with the way people and computers…
This tutorial will walk an individual through locating and launching the BEUtility application and how to execute it on the appropriate database. Log onto the server running the Backup Exec database. In a larger environment, this would generally be …
This tutorial will show how to configure a new Backup Exec 2012 server and move an existing database to that server with the use of the BEUtility. Install Backup Exec 2012 on the new server and apply all of the latest hotfixes and service packs. The…

823 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question