1 Currently unreadable (pending) sector.

[Abhinav2004]

Hi

So today I started my home NAS and to my unfortunate fate I found this:

I searched for the error mentioned in the title on this forum and followed the instructions to perform a normal SMART test on my drive but it completed the test without errors. That seems a bit weird. So could someone help me out with this? Following is the log that the test spat out:

Code:

# smartctl -a /dev/ada1
smartctl 6.4 2015-06-04 r4109 [FreeBSD 10.3-RELEASE amd64] (local build)
Copyright (C) 2002-15, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:	 Western Digital Red
Device Model:	 WDC WD20EFRX-68EUZN0
Serial Number:	WD-WCC4M5YF6529
LU WWN Device Id: 5 0014ee 261c322a1
Firmware Version: 82.00A82
User Capacity:	2,000,398,934,016 bytes [2.00 TB]
Sector Sizes:	 512 bytes logical, 4096 bytes physical
Rotation Rate:	5400 rpm
Device is:		In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:	Sun Jan  8 21:22:42 2017 IST
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:		 (27360) seconds.
Offline data collection
capabilities:			 (0x7b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					Conveyance Self-test supported.
					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:	 ( 276) minutes.
Conveyance self-test routine
recommended polling time:	 (   5) minutes.
SCT capabilities:		   (0x703d)	SCT Status supported.
					SCT Error Recovery Control supported.
					SCT Feature Control supported.
					SCT Data Table supported.

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME		  FLAG	 VALUE WORST THRESH TYPE	  UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate	 0x002f   200   200   051	Pre-fail  Always	   -	   3
  3 Spin_Up_Time			0x0027   178   173   021	Pre-fail  Always	   -	   4066
  4 Start_Stop_Count		0x0032   100   100   000	Old_age   Always	   -	   111
  5 Reallocated_Sector_Ct   0x0033   200   200   140	Pre-fail  Always	   -	   0
  7 Seek_Error_Rate		 0x002e   200   200   000	Old_age   Always	   -	   0
  9 Power_On_Hours		  0x0032   088   088   000	Old_age   Always	   -	   8889
10 Spin_Retry_Count		0x0032   100   100   000	Old_age   Always	   -	   0
11 Calibration_Retry_Count 0x0032   100   100   000	Old_age   Always	   -	   0
12 Power_Cycle_Count	   0x0032   100   100   000	Old_age   Always	   -	   111
192 Power-Off_Retract_Count 0x0032   200   200   000	Old_age   Always	   -	   75
193 Load_Cycle_Count		0x0032   200   200   000	Old_age   Always	   -	   159
194 Temperature_Celsius	 0x0022   115   105   000	Old_age   Always	   -	   32
196 Reallocated_Event_Count 0x0032   200   200   000	Old_age   Always	   -	   0
197 Current_Pending_Sector  0x0032   200   200   000	Old_age   Always	   -	   1
198 Offline_Uncorrectable   0x0030   100   253   000	Old_age   Offline	  -	   0
199 UDMA_CRC_Error_Count	0x0032   200   200   000	Old_age   Always	   -	   0
200 Multi_Zone_Error_Rate   0x0008   200   200   000	Old_age   Offline	  -	   1

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description	Status				  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline	Completed without error	   00%	  8888		 -

SMART Selective self-test log data structure revision number 1
SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
	1		0		0  Not_testing
	2		0		0  Not_testing
	3		0		0  Not_testing
	4		0		0  Not_testing
	5		0		0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

Thanks in advance :)
Abhinav

 

[m0nkey_]

You clearly are not running any sort of scheduled SMART tests.

Schedule some SMART tests and replace the drive.

 

[wblock]

Isn't the alert from a scheduled SMART test?

 

[bigphil]

Isn't the alert from a scheduled SMART test?

No. It's from the auto polling interval. You have to setup scheduled SMART scans yourself.

 

[Robert Trevellyan]

Code:

197 Current_Pending_Sector  0x0032   200   200   000	Old_age   Always	   -	   1

This indicates a sector that may be marginal, because a read failed, but it hasn't been reallocated yet, because it hasn't shown a failed write. Get a proper SMART testing schedule set up and keep an eye on it. If the count starts to rise, you might consider revalidating the disk with badblocks, and/or replacing it.