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what does uncorrectable ECC count mean?


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#1 argonvegell

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Posted 22 August 2017 - 07:11 AM

About 3 months ago, I replaced the 120GB WD HDD which has 200+ bad sectors with a 120GB WD Green SSD on my Dell Inspiron E1505 laptop bought in 2007 and installed Lubuntu 16.04 on it.

It's running great and fast, however, I am a little concerned about the uncorrectable ECC count, I know very little about SSD drives since this is my first experience with using a SSD drive.

According to GNOME Disk Utility, the SSD is okay, reallocated sector count is 0 and reported uncorrectable errors is 0, but the uncorrectable ECC count is 197 sectors, is this something I should be concerned about?


Edited by argonvegell, 22 August 2017 - 07:15 AM.


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#2 Platypus

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Posted 22 August 2017 - 07:50 AM

That seems to me to be inconsistent information, and my first thought is that S.M.A.R.T attributes are not consistently implemented between different manufacturers, and a specific diagnostic for WD drives may report a different result. However as far as I know, manufacturer diagnostic utilities from WD are for Windows and Mac OS:

https://support.wdc.com/downloads.aspx?p=279

So if you wanted to confirm the drive's status (potentially to RMA it if it is actually developing faults), it may be that you'd need to temporarily fit it as a secondary drive in another computer and install the utility to test your drive.

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#3 argonvegell

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Posted 22 August 2017 - 07:59 AM

Well, unfortunately, I don't have access to Windows or MacOS, my Desktop runs Xubuntu, so both my computers runs Linux.

 

I don't think there's anything wrong with my SSD, like I said, the drive runs smooth and fast, no problems with performance, but the uncorrectable ECC count has gotten me a little worried.

 

But what does ECC mean?



#4 Platypus

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Posted 22 August 2017 - 08:27 AM

ECC is Error Checking and Correction and the Uncorrectable ECC Count should record the number of times a data transfer within the drive had an error that was unable to be corrected by the ECC algorithm.

However, you've mentioned it in the context of sectors. How is the information being presented, as an on-screen table? Is it possible that the information is showing in such a way that the label of Attribute ID 197 (Pending Sector Count) appears to be the value of Reported Uncorrectable Errors?


Edited by Platypus, 22 August 2017 - 08:27 AM.

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#5 argonvegell

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Posted 22 August 2017 - 08:41 AM

At the moment, I'm away from the house, so I'll check when I come home.

Thanks.



#6 jonuk76

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Posted 22 August 2017 - 09:03 AM

A disk health utility available for Linux, which may give a bit more info than the standard disk utility is smartmontools. It has an optional GUI front end called GSmartControl.  They should be in the Ubuntu repo's. Guide here - https://help.ubuntu.com/community/Smartmontools


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#7 argonvegell

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Posted 22 August 2017 - 07:48 PM

ECC is Error Checking and Correction and the Uncorrectable ECC Count should record the number of times a data transfer within the drive had an error that was unable to be corrected by the ECC algorithm.

However, you've mentioned it in the context of sectors. How is the information being presented, as an on-screen table? Is it possible that the information is showing in such a way that the label of Attribute ID 197 (Pending Sector Count) appears to be the value of Reported Uncorrectable Errors?

I checked, there is no Attribute ID 197 (Pending Sector Count).

 

Here's the results of smartctl:

smartctl 6.5 2016-01-24 r4214 [i686-linux-4.10.0-32-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Device Model:     WDC WDS120G1G0A-00SS50
Serial Number:    171301A00E4C
LU WWN Device Id: 5 001b44 8b4ee0216
Firmware Version: Z3311000
User Capacity:    120,034,123,776 bytes [120 GB]
Sector Size:      512 bytes logical/physical
Rotation Rate:    Solid State Device
Form Factor:      2.5 inches
Device is:        Not in smartctl database [for details use: -P showall]
ATA Version is:   ACS-2 T13/2015-D revision 3
SATA Version is:  SATA 3.2, 6.0 Gb/s (current: 1.5 Gb/s)
Local Time is:    Wed Aug 23 08:14:55 2017 PHT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status:  (0x00)    Offline data collection activity
                    was never started.
                    Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0)    The previous self-test routine completed
                    without error or no self-test has ever
                    been run.
Total time to complete Offline
data collection:         (  120) seconds.
Offline data collection
capabilities:              (0x11) SMART execute Offline immediate.
                    No Auto Offline data collection support.
                    Suspend Offline collection upon new
                    command.
                    No Offline surface scan supported.
                    Self-test supported.
                    No Conveyance Self-test supported.
                    No Selective Self-test supported.
SMART capabilities:            (0x0003)    Saves SMART data before entering
                    power-saving mode.
                    Supports SMART auto save timer.
Error logging capability:        (0x01)    Error logging supported.
                    General Purpose Logging supported.
Short self-test routine
recommended polling time:      (   2) minutes.
Extended self-test routine
recommended polling time:      (  10) minutes.

SMART Attributes Data Structure revision number: 1
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  5 Reallocated_Sector_Ct   0x0032   100   100   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   000   100   000    Old_age   Always       -       393
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       77
165 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       4298244138
166 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0
167 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0
168 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       1
169 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0
170 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0
171 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0
172 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0
173 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       0
174 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       2
187 Reported_Uncorrect      0x0032   100   100   000    Old_age   Always       -       0
188 Command_Timeout         0x0032   100   100   000    Old_age   Always       -       0
194 Temperature_Celsius     0x0022   062   046   000    Old_age   Always       -       38 (Min/Max 0/54)
199 UDMA_CRC_Error_Count    0x0032   100   100   000    Old_age   Always       -       0
230 Unknown_SSD_Attribute   0x0032   100   100   000    Old_age   Always       -       60129935374
232 Available_Reservd_Space 0x0033   100   100   004    Pre-fail  Always       -       100
233 Media_Wearout_Indicator 0x0032   100   100   000    Old_age   Always       -       55
234 Unknown_Attribute       0x0032   100   100   000    Old_age   Always       -       198
241 Total_LBAs_Written      0x0030   253   253   000    Old_age   Offline      -       156
242 Total_LBAs_Read         0x0030   253   253   000    Old_age   Offline      -       200
244 Unknown_Attribute       0x0032   000   100   000    Old_age   Always       -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]

Selective Self-tests/Logging not supported

In GNOME Disk Utility, uncorrectable ECC count is 198, while in smartctl, it's referred to as 234 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 198.



#8 dropbear

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Posted 22 August 2017 - 10:51 PM

a non-zero value in this sort of field is not good, but it is what it is, some error occurred that couldn't be resolved by the hardware.

S.M.A.R.T doesn't record when it happened.

a more important issue is watching that field to see if it changes.

if it does, then you have real concerns.


Instead of reading this, why not do a backup of your PC.

You won't regret it.


#9 Platypus

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Posted 23 August 2017 - 03:23 AM

To me, that confirms that the parameters are being incorrectly identified, and possibly only the WD utilities will correctly assess the drive. However I doubt if there is any problem.

 

ID# 234 is expected to be the Erase Count.

ID# 187 is Reported Uncorrectable ECC count - in your drive's case having a raw value of zero with the expected health rating of 100%

 

Here is an example of smartctl having the same problem with a Seagate SSD:

 

http://www.dslreports.com/forum/r28867218-hard-drive-Anyone-know-what-SMART-ID-234-is


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#10 argonvegell

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Posted 23 August 2017 - 08:03 AM

Okay, you mean smartctl is in error when it recorded the uncorrectable ECC count then? Looking at the source you've given me, looks like this is a false positive. Thanks for the help :)




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