How can smart test fail but the drive operates flawlesly?


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Hi,

 

This is possibly a silly question but I was wondering how a smart test can fail, but the entire mechnical hdd is able to write the entire disk and read it back with no errors reported. What am I not understanding?

 

Tested clearing the disk with shred 3 passes and tested reading the whole disk back with dd and got no errors, normal performance figures. How is this possible?

 

Maybe some of you drive experts can figure this out.


 

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Red
Device Model:     WDC WD60EFRX-68MYMN1
Serial Number:    WD-#################
LU WWN Device Id: 5 0014ee 2b73476cd
Firmware Version: 82.00A82
User Capacity:    6,001,175,126,016 bytes [6.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5700 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
SMART support is: Available - device has SMART capability.
SMART support is: Enabled



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       -       0
  3 Spin_Up_Time            0x0027   253   228   021    Pre-fail  Always       -       5800
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       50
  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   048   048   000    Old_age   Always       -       38350
 10 Spin_Retry_Count        0x0032   100   253   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       49
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       41
193 Load_Cycle_Count        0x0032   170   170   000    Old_age   Always       -       91648
194 Temperature_Celsius     0x0022   115   103   000    Old_age   Always       -       37
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
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      -       0

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  Short offline       Completed: read failure       70%     38209         3130108536
# 2  Extended offline    Completed without error       00%     38138         -
# 3  Short offline       Completed: read failure       60%     38042         3130108384
# 4  Extended offline    Completed without error       00%     37998         -
# 5  Short offline       Completed without error       00%     37874         -

 

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At least the short test seems to succeed now. Left the long test running, but it will take until morning. My confidance in SMART is not great at the moment :)

 

Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%     38358         -
# 2  Short offline       Completed: read failure       70%     38209         3130108536
# 3  Extended offline    Completed without error       00%     38138         -
# 4  Short offline       Completed: read failure       60%     38042         3130108384
# 5  Extended offline    Completed without error       00%     37998         -

Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Short offline       Completed without error       00%     38358         -
# 2  Short offline       Completed: read failure       70%     38209         3130108536
# 3  Extended offline    Completed without error       00%     38138         -
# 4  Short offline       Completed: read failure       60%     38042         3130108384
# 5  Extended offline    Completed without error       00%     37998         -

 

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One thing I forgot to mention, if if didn't do a pre-read test first then it's not so strange, i.e., a disk is failing, you do a full write and it starts working, sometimes just for a little while, others it can work for years without issues, not normal would be a read test not failing after a SMART test fail.

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Well it seems to be "fixed" now. Not sure how much I trust the disk but it does seem to operate and the full smart test went OK

 

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       -       0
  3 Spin_Up_Time            0x0027   248   228   021    Pre-fail  Always       -       6591
  4 Start_Stop_Count        0x0032   100   100   000    Old_age   Always       -       51
  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   048   048   000    Old_age   Always       -       38381
 10 Spin_Retry_Count        0x0032   100   253   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   253   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       50
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       41
193 Load_Cycle_Count        0x0032   170   170   000    Old_age   Always       -       91660
194 Temperature_Celsius     0x0022   119   103   000    Old_age   Always       -       33
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
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      -       0

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%     38370         -
# 2  Short offline       Completed without error       00%     38358         -
# 3  Short offline       Completed: read failure       70%     38209         3130108536
# 4  Extended offline    Completed without error       00%     38138         -
# 5  Short offline       Completed: read failure       60%     38042         3130108384

 

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