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SMART Errors

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So I just found some errors in the Disk error Log area of the Disk Health page for one of my disks.  I am not great at reading these errors and understanding the severity of them. I have pasted the errors below.  Should I replace this disk?  Or is this normal?

 

ATA Error Count: 67 (device log contains only the most recent five errors)

CR = Command Register [HEX]

FR = Features Register [HEX]

SC = Sector Count Register [HEX]

SN = Sector Number Register [HEX]

CL = Cylinder Low Register [HEX]

CH = Cylinder High Register [HEX]

DH = Device/Head Register [HEX]

DC = Device Command Register [HEX]

ER = Error register [HEX]

ST = Status register [HEX]

Powered_Up_Time is measured from power on, and printed as

DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes,

SS=sec, and sss=millisec. It "wraps" after 49.710 days.

 

Error 67 occurred at disk power-on lifetime: 26486 hours (1103 days + 14 hours)

  When the command that caused the error occurred, the device was active or idle.

 

  After command completion occurred, registers were:

  ER ST SC SN CL CH DH

  -- -- -- -- -- -- --

  40 51 bb 4c a9 9e 00  Error: UNC 187 sectors at LBA = 0x009ea94c = 10398028

 

  Commands leading to the command that caused the error were:

  CR FR SC SN CL CH DH DC  Powered_Up_Time  Command/Feature_Name

  -- -- -- -- -- -- -- --  ----------------  --------------------

  25 00 00 07 a6 9e e0 08  24d+21:25:30.150  READ DMA EXT

  27 00 00 00 00 00 e0 08  24d+21:25:29.703  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

  ec 00 00 00 00 00 a0 08  24d+21:25:29.579  IDENTIFY DEVICE

  ef 03 46 00 00 00 a0 08  24d+21:25:29.460  SET FEATURES [set transfer mode]

  27 00 00 00 00 00 e0 08  24d+21:25:29.458  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

 

Error 66 occurred at disk power-on lifetime: 26486 hours (1103 days + 14 hours)

  When the command that caused the error occurred, the device was active or idle.

 

  After command completion occurred, registers were:

  ER ST SC SN CL CH DH

  -- -- -- -- -- -- --

  40 51 bb 4c a9 9e 00  Error: UNC 187 sectors at LBA = 0x009ea94c = 10398028

 

  Commands leading to the command that caused the error were:

  CR FR SC SN CL CH DH DC  Powered_Up_Time  Command/Feature_Name

  -- -- -- -- -- -- -- --  ----------------  --------------------

  25 00 00 07 a6 9e e0 08  24d+21:25:09.712  READ DMA EXT

  27 00 00 00 00 00 e0 08  24d+21:25:09.256  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

  ec 00 00 00 00 00 a0 08  24d+21:25:09.133  IDENTIFY DEVICE

  ef 03 46 00 00 00 a0 08  24d+21:25:09.013  SET FEATURES [set transfer mode]

  27 00 00 00 00 00 e0 08  24d+21:25:09.011  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

 

Error 65 occurred at disk power-on lifetime: 26486 hours (1103 days + 14 hours)

  When the command that caused the error occurred, the device was active or idle.

 

  After command completion occurred, registers were:

  ER ST SC SN CL CH DH

  -- -- -- -- -- -- --

  40 51 bb 4c a9 9e 00  Error: UNC 187 sectors at LBA = 0x009ea94c = 10398028

 

  Commands leading to the command that caused the error were:

  CR FR SC SN CL CH DH DC  Powered_Up_Time  Command/Feature_Name

  -- -- -- -- -- -- -- --  ----------------  --------------------

  25 00 00 07 a6 9e e0 08  24d+21:24:49.325  READ DMA EXT

  27 00 00 00 00 00 e0 08  24d+21:24:48.870  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

  ec 00 00 00 00 00 a0 08  24d+21:24:48.747  IDENTIFY DEVICE

  ef 03 46 00 00 00 a0 08  24d+21:24:48.627  SET FEATURES [set transfer mode]

  27 00 00 00 00 00 e0 08  24d+21:24:48.626  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

 

Error 64 occurred at disk power-on lifetime: 26486 hours (1103 days + 14 hours)

  When the command that caused the error occurred, the device was active or idle.

 

  After command completion occurred, registers were:

  ER ST SC SN CL CH DH

  -- -- -- -- -- -- --

  40 51 bb 4c a9 9e 00  Error: UNC 187 sectors at LBA = 0x009ea94c = 10398028

 

  Commands leading to the command that caused the error were:

  CR FR SC SN CL CH DH DC  Powered_Up_Time  Command/Feature_Name

  -- -- -- -- -- -- -- --  ----------------  --------------------

  25 00 00 07 a6 9e e0 08  24d+21:24:28.939  READ DMA EXT

  27 00 00 00 00 00 e0 08  24d+21:24:28.484  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

  ec 00 00 00 00 00 a0 08  24d+21:24:28.361  IDENTIFY DEVICE

  ef 03 46 00 00 00 a0 08  24d+21:24:28.241  SET FEATURES [set transfer mode]

  27 00 00 00 00 00 e0 08  24d+21:24:28.240  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

 

Error 63 occurred at disk power-on lifetime: 26486 hours (1103 days + 14 hours)

  When the command that caused the error occurred, the device was active or idle.

 

  After command completion occurred, registers were:

  ER ST SC SN CL CH DH

  -- -- -- -- -- -- --

  40 51 bb 4c a9 9e 00  Error: UNC 187 sectors at LBA = 0x009ea94c = 10398028

 

  Commands leading to the command that caused the error were:

  CR FR SC SN CL CH DH DC  Powered_Up_Time  Command/Feature_Name

  -- -- -- -- -- -- -- --  ----------------  --------------------

  25 00 00 07 a6 9e e0 08  24d+21:24:08.552  READ DMA EXT

  27 00 00 00 00 00 e0 08  24d+21:24:08.037  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

  ec 00 00 00 00 00 a0 08  24d+21:24:07.914  IDENTIFY DEVICE

  ef 03 46 00 00 00 a0 08  24d+21:24:07.794  SET FEATURES [set transfer mode]

  27 00 00 00 00 00 e0 08  24d+21:24:07.793  READ NATIVE MAX ADDRESS EXT [OBS-ACS-3]

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