This morning I awoke to my 8TB Disk 1 having 171 read errors and the following notifications that I had current pending sectors: Once I rebooted my server, all the read errors were gone. I then did an extended self test that "Completed without error". I am new to NAS and Unraid so I am unsure when is the best time to replace a drive. Even though the extended SMART self test had no errors, I still had 7 Reported Uncorrectable Errors in my Device Statistics Error when I used the smartctl -x command. Heres is the output: root@oracle:~# smartctl -x /dev/sdi smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.12.24-Unraid] (local build) Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Model Family: Western Digital Gold Device Model: WDC WD8002FRYZ-01FF2B0 Serial Number: VJHAUP9X LU WWN Device Id: 5 000cca 261d303a4 Firmware Version: 01.01H01 User Capacity: 8,001,563,222,016 bytes [8.00 TB] Sector Sizes: 512 bytes logical, 4096 bytes physical Rotation Rate: 7200 rpm Form Factor: 3.5 inches Device is: In smartctl database 7.3/5706 ATA Version is: ACS-2, ATA8-ACS T13/1699-D revision 4 SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s) Local Time is: Sun Oct 12 14:27:03 2025 EDT SMART support is: Available - device has SMART capability. SMART support is: Enabled AAM feature is: Unavailable APM feature is: Disabled Rd look-ahead is: Enabled Write cache is: Enabled DSN feature is: Unavailable ATA Security is: Disabled, frozen [SEC2] Wt Cache Reorder: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x82) Offline data collection activity was completed without error. Auto Offline Data Collection: Enabled. 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: ( 101) seconds. Offline data collection capabilities: (0x5b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. No 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: (1250) minutes. SCT capabilities: (0x003d) 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 FLAGS VALUE WORST THRESH FAIL RAW_VALUE 1 Raw_Read_Error_Rate PO-R-- 100 100 016 - 0 2 Throughput_Performance P-S--- 134 134 054 - 104 3 Spin_Up_Time POS--- 180 180 024 - 365 (Average 365) 4 Start_Stop_Count -O--C- 100 100 000 - 79 5 Reallocated_Sector_Ct PO--CK 100 100 005 - 0 7 Seek_Error_Rate PO-R-- 100 100 067 - 0 8 Seek_Time_Performance P-S--- 128 128 020 - 18 9 Power_On_Hours -O--C- 096 096 000 - 31985 10 Spin_Retry_Count PO--C- 100 100 060 - 0 12 Power_Cycle_Count -O--CK 100 100 000 - 79 22 Helium_Level PO---K 100 100 025 - 100 192 Power-Off_Retract_Count -O--CK 099 099 000 - 1390 193 Load_Cycle_Count -O--C- 099 099 000 - 1390 194 Temperature_Celsius -O---- 200 200 000 - 30 (Min/Max 18/41) 196 Reallocated_Event_Count -O--CK 100 100 000 - 0 197 Current_Pending_Sector -O---K 100 100 000 - 0 198 Offline_Uncorrectable ---R-- 100 100 000 - 0 199 UDMA_CRC_Error_Count -O-R-- 200 200 000 - 0 ||||||_ K auto-keep |||||__ C event count ||||___ R error rate |||____ S speed/performance ||_____ O updated online |______ P prefailure warning General Purpose Log Directory Version 1 SMART Log Directory Version 1 [multi-sector log support] Address Access R/W Size Description 0x00 GPL,SL R/O 1 Log Directory 0x01 SL R/O 1 Summary SMART error log 0x02 SL R/O 1 Comprehensive SMART error log 0x03 GPL R/O 1 Ext. Comprehensive SMART error log 0x04 GPL,SL R/O 8 Device Statistics log 0x06 SL R/O 1 SMART self-test log 0x07 GPL R/O 1 Extended self-test log 0x08 GPL R/O 2 Power Conditions log 0x09 SL R/W 1 Selective self-test log 0x10 GPL R/O 1 NCQ Command Error log 0x11 GPL R/O 1 SATA Phy Event Counters log 0x12 GPL R/O 1 SATA NCQ Non-Data log 0x15 GPL,SL R/W 1 Rebuild Assist log 0x21 GPL R/O 1 Write stream error log 0x22 GPL R/O 1 Read stream error log 0x24 GPL R/O 256 Current Device Internal Status Data log 0x25 GPL R/O 256 Saved Device Internal Status Data log 0x30 GPL,SL R/O 9 IDENTIFY DEVICE data log 0x80-0x9f GPL,SL R/W 16 Host vendor specific log 0xe0 GPL,SL R/W 1 SCT Command/Status 0xe1 GPL,SL R/W 1 SCT Data Transfer SMART Extended Comprehensive Error Log Version: 1 (1 sectors) Device Error Count: 7 (device log contains only the most recent 4 errors) CR = Command Register FEATR = Features Register COUNT = Count (was: Sector Count) Register LBA_48 = Upper bytes of LBA High/Mid/Low Registers ] ATA-8 LH = LBA High (was: Cylinder High) Register ] LBA LM = LBA Mid (was: Cylinder Low) Register ] Register LL = LBA Low (was: Sector Number) Register ] DV = Device (was: Device/Head) Register DC = Device Control Register ER = Error register ST = Status register 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 7 [2] occurred at disk power-on lifetime: 31973 hours (1332 days + 5 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER -- ST COUNT LBA_48 LH LM LL DV DC -- -- -- == -- == == == -- -- -- -- -- 40 -- 43 00 00 00 00 00 00 00 00 00 00 Error: UNC at LBA = 0x00000000 = 0 Commands leading to the command that caused the error were: CR FEATR COUNT LBA_48 LH LM LL DV DC Powered_Up_Time Command/Feature_Name -- -- -- == == == -- -- -- -- -- --------------- -------------------- 60 01 00 00 10 00 03 9f 99 53 00 40 08 16d+04:23:54.053 READ FPDMA QUEUED 61 00 10 00 b8 00 03 11 32 2b a8 40 08 16d+04:23:50.901 WRITE FPDMA QUEUED 61 00 a0 00 b0 00 03 11 32 2b 08 40 08 16d+04:23:50.901 WRITE FPDMA QUEUED 61 00 e0 00 a0 00 03 11 32 2a 28 40 08 16d+04:23:50.901 WRITE FPDMA QUEUED 61 01 a8 00 90 00 03 11 32 28 80 40 08 16d+04:23:50.901 WRITE FPDMA QUEUED Error 6 [1] occurred at disk power-on lifetime: 31973 hours (1332 days + 5 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER -- ST COUNT LBA_48 LH LM LL DV DC -- -- -- == -- == == == -- -- -- -- -- 40 -- 43 00 00 00 00 00 00 00 00 00 00 Error: UNC at LBA = 0x00000000 = 0 Commands leading to the command that caused the error were: CR FEATR COUNT LBA_48 LH LM LL DV DC Powered_Up_Time Command/Feature_Name -- -- -- == == == -- -- -- -- -- --------------- -------------------- 60 00 68 00 08 00 03 9f 99 4c 98 40 08 16d+04:23:49.803 READ FPDMA QUEUED 61 04 08 00 f8 00 02 9d 3b 28 90 40 08 16d+04:23:46.800 WRITE FPDMA QUEUED 61 04 00 00 d8 00 02 9d 3b 24 90 40 08 16d+04:23:46.799 WRITE FPDMA QUEUED 61 04 00 00 d0 00 02 9d 3b 20 90 40 08 16d+04:23:46.798 WRITE FPDMA QUEUED 61 04 00 00 88 00 02 9d 3b 1c 90 40 08 16d+04:23:46.797 WRITE FPDMA QUEUED Error 5 [0] occurred at disk power-on lifetime: 31973 hours (1332 days + 5 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER -- ST COUNT LBA_48 LH LM LL DV DC -- -- -- == -- == == == -- -- -- -- -- 40 -- 43 00 00 00 00 00 00 00 00 00 00 Error: UNC at LBA = 0x00000000 = 0 Commands leading to the command that caused the error were: CR FEATR COUNT LBA_48 LH LM LL DV DC Powered_Up_Time Command/Feature_Name -- -- -- == == == -- -- -- -- -- --------------- -------------------- 60 01 00 00 30 00 03 9f 98 fb 00 40 08 16d+04:23:43.844 READ FPDMA QUEUED 60 03 58 00 a8 00 03 11 31 48 80 40 08 16d+04:23:40.953 READ FPDMA QUEUED 60 04 00 00 a0 00 03 11 31 44 80 40 08 16d+04:23:40.953 READ FPDMA QUEUED 60 01 00 00 98 00 03 9f 98 fc 00 40 08 16d+04:23:40.953 READ FPDMA QUEUED 60 04 08 00 90 00 03 11 31 40 78 40 08 16d+04:23:40.953 READ FPDMA QUEUED Error 4 [3] occurred at disk power-on lifetime: 31973 hours (1332 days + 5 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER -- ST COUNT LBA_48 LH LM LL DV DC -- -- -- == -- == == == -- -- -- -- -- 40 -- 43 00 00 00 00 00 00 00 00 00 00 Error: UNC at LBA = 0x00000000 = 0 Commands leading to the command that caused the error were: CR FEATR COUNT LBA_48 LH LM LL DV DC Powered_Up_Time Command/Feature_Name -- -- -- == == == -- -- -- -- -- --------------- -------------------- 60 01 00 00 10 00 03 9f 98 f4 00 40 08 16d+04:23:40.253 READ FPDMA QUEUED 61 04 00 00 f8 00 02 9d 3a 20 b0 40 08 16d+04:23:37.338 WRITE FPDMA QUEUED 61 04 08 00 b8 00 02 9d 3a 1c a8 40 08 16d+04:23:37.338 WRITE FPDMA QUEUED 61 00 10 00 b0 00 02 9d 3a 1c 98 40 08 16d+04:23:37.337 WRITE FPDMA QUEUED 61 04 08 00 a8 00 02 9d 3a 18 90 40 08 16d+04:23:37.336 WRITE FPDMA QUEUED SMART Extended Self-test Log Version: 1 (1 sectors) Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed without error 00% 31983 - 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. SCT Status Version: 3 SCT Version (vendor specific): 256 (0x0100) Device State: Active (0) Current Temperature: 30 Celsius Power Cycle Min/Max Temperature: 30/34 Celsius Lifetime Min/Max Temperature: 18/41 Celsius Under/Over Temperature Limit Count: 0/0 SCT Temperature History Version: 2 Temperature Sampling Period: 1 minute Temperature Logging Interval: 1 minute Min/Max recommended Temperature: 0/60 Celsius Min/Max Temperature Limit: -40/70 Celsius Temperature History Size (Index): 128 (24) Index Estimated Time Temperature Celsius 25 2025-10-12 12:20 32 ************* ... ..( 37 skipped). .. ************* 63 2025-10-12 12:58 32 ************* 64 2025-10-12 12:59 31 ************ ... ..( 12 skipped). .. ************ 77 2025-10-12 13:12 31 ************ 78 2025-10-12 13:13 30 *********** ... ..( 72 skipped). .. *********** 23 2025-10-12 14:26 30 *********** 24 2025-10-12 14:27 32 ************* SCT Error Recovery Control: Read: Disabled Write: Disabled Device Statistics (GP Log 0x04) Page Offset Size Value Flags Description 0x01 ===== = = === General Statistics (rev 2) 0x01 0x008 4 79 --- Lifetime Power-On Resets 0x01 0x018 6 325510502989 --- Logical Sectors Written 0x01 0x020 6 674668127 --- Number of Write Commands 0x01 0x028 6 1778393275929 --- Logical Sectors Read 0x01 0x030 6 3290329868 --- Number of Read Commands 0x01 0x038 6 115147713650 --- Date and Time TimeStamp 0x03 ===== = = === Rotating Media Statistics (rev 1) 0x03 0x008 4 31879 --- Spindle Motor Power-on Hours 0x03 0x010 4 31879 --- Head Flying Hours 0x03 0x018 4 1390 --- Head Load Events 0x03 0x020 4 0 --- Number of Reallocated Logical Sectors 0x03 0x028 4 6786570 --- Read Recovery Attempts 0x03 0x030 4 0 --- Number of Mechanical Start Failures 0x04 ===== = = === General Errors Statistics (rev 1) 0x04 0x008 4 7 --- Number of Reported Uncorrectable Errors 0x04 0x010 4 0 --- Resets Between Cmd Acceptance and Completion 0x05 ===== = = === Temperature Statistics (rev 1) 0x05 0x008 1 30 --- Current Temperature 0x05 0x010 1 31 N-- Average Short Term Temperature 0x05 0x018 1 31 N-- Average Long Term Temperature 0x05 0x020 1 41 --- Highest Temperature 0x05 0x028 1 18 --- Lowest Temperature 0x05 0x030 1 37 N-- Highest Average Short Term Temperature 0x05 0x038 1 25 N-- Lowest Average Short Term Temperature 0x05 0x040 1 35 N-- Highest Average Long Term Temperature 0x05 0x048 1 25 N-- Lowest Average Long Term Temperature 0x05 0x050 4 0 --- Time in Over-Temperature 0x05 0x058 1 60 --- Specified Maximum Operating Temperature 0x05 0x060 4 0 --- Time in Under-Temperature 0x05 0x068 1 0 --- Specified Minimum Operating Temperature 0x06 ===== = = === Transport Statistics (rev 1) 0x06 0x008 4 9 --- Number of Hardware Resets 0x06 0x010 4 109 --- Number of ASR Events 0x06 0x018 4 0 --- Number of Interface CRC Errors |||_ C monitored condition met ||__ D supports DSN |___ N normalized value Pending Defects log (GP Log 0x0c) not supported SATA Phy Event Counters (GP Log 0x11) ID Size Value Description 0x0001 2 0 Command failed due to ICRC error 0x0002 2 0 R_ERR response for data FIS 0x0003 2 0 R_ERR response for device-to-host data FIS 0x0004 2 0 R_ERR response for host-to-device data FIS 0x0005 2 0 R_ERR response for non-data FIS 0x0006 2 0 R_ERR response for device-to-host non-data FIS 0x0007 2 0 R_ERR response for host-to-device non-data FIS 0x0008 2 0 Device-to-host non-data FIS retries 0x0009 2 8 Transition from drive PhyRdy to drive PhyNRdy 0x000a 2 6 Device-to-host register FISes sent due to a COMRESET 0x000b 2 0 CRC errors within host-to-device FIS 0x000d 2 0 Non-CRC errors within host-to-device FIS I feel that it is too early to replace this drive because I still have parity protection. However, I'd like the community's opinion on whether it's smarter to replace now.