FloPinguin

This time not. But the following reasons were enough for me to take the disk out of service: Read errors while parity checking even after sata cable replacing and switching Read errors while file moving, always with the same files, I couldn't move them (Tried it multiple times) Two preclears with different scripts failed while pre-reading at about 90% After removing the disk, my samba share performance increased A LOT (This problem got fixed). But at about the same time I upgraded Unraid from 6.7 to 6.8.3, so maybe it was not the disks fault. But I think so.

Done. Completed again without errors. I also did another preclear (This time with the Joe L script), and at 90% pre-read it just stopped (No more progress was visible for multiple hours). The other preclear with the gfjardim script also died at about 90%. I suspect the SMART system of this drive isn't working like it should.

Oh and my syslog is really full of errors

I think I have found a bug. After some read errors, preclear died while pre-reading and says "RESULT: Preclear Finished Successfully!" (Two syntax errors happened). ############################################################################################################################ # # # unRAID Server Preclear of disk WD-WCC130368601 # # Cycle 1 of 1, partition start on sector 64. # # # # # # Step 1 of 5 - Pre-read in progress: (90% Done) # # # # # # # # # # # # # # # # # # # # ** Time elapsed: 8:06:10 | Current speed: 123 MB/s | Average speed: 123 MB/s # # # ############################################################################################################################ # Cycle elapsed time: 8:06:12 | Total elapsed time: 8:06:12 # ############################################################################################################################ ############################################################################################################################ # # # S.M.A.R.T. Status (device type: default) # # # # # # ATTRIBUTE INITIAL STATUS # # 5-Reallocated_Sector_Ct 0 - # # 9-Power_On_Hours 10329 - # # 194-Temperature_Celsius 44 - # # 196-Reallocated_Event_Count 0 - # # 197-Current_Pending_Sector 0 - # # 198-Offline_Uncorrectable 0 - # # 199-UDMA_CRC_Error_Count 142 - # # # # # # # # # # # ############################################################################################################################ # SMART overall-health self-assessment test result: PASSED # ############################################################################################################################ /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh: line 844: 8:06:10 + 3 : syntax error in expression (error token is ":06:10 + 3 ") /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh: line 1139: 8:06:10 : syntax error in expression (error token is ":06:10 ") --> ATTENTION: Please take a look into the SMART report above for drive health issues. --> RESULT: Preclear Finished Successfully!. Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: Command: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh --notify 1 --frequency 2 --cycles 1 --no-prompt /dev/sdf Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: Preclear Disk Version: 1.0.16 Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: S.M.A.R.T. info type: default Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: S.M.A.R.T. attrs type: default Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: Disk size: 12000105070592 Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: Disk blocks: 2929713152 Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: Blocks (512 bytes): 23437705216 Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: Block size: 4096 Jun 03 19:07:38 preclear_disk_5A32483747533054_9294: Start sector: 512 Jun 03 19:07:39 preclear_disk_5A32483747533054_9294: Pre-Read: dd if=/dev/sdf of=/dev/null bs=2097152 skip=0 count=12000105070592 conv=notrunc,noerror iflag=nocache,count_bytes,skip_bytes Jun 03 19:09:40 preclear_disk_5A32483747533054_9294: SIGINT received, exiting... Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: Command: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh --notify 1 --frequency 2 --cycles 1 --no-prompt /dev/sdf Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: Preclear Disk Version: 1.0.16 Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: S.M.A.R.T. info type: default Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: S.M.A.R.T. attrs type: default Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: Disk size: 12000105070592 Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: Disk blocks: 2929713152 Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: Blocks (512 bytes): 23437705216 Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: Block size: 4096 Jun 03 19:12:52 preclear_disk_5A32483747533054_29410: Start sector: 512 Jun 03 19:12:54 preclear_disk_5A32483747533054_29410: Pre-Read: dd if=/dev/sdf of=/dev/null bs=2097152 skip=0 count=12000105070592 conv=notrunc,noerror iflag=nocache,count_bytes,skip_bytes Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: Command: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh --notify 1 --frequency 2 --cycles 1 --no-prompt /dev/sdg Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: Preclear Disk Version: 1.0.16 Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: S.M.A.R.T. info type: default Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: S.M.A.R.T. attrs type: default Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: Disk size: 12000105070592 Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: Disk blocks: 2929713152 Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: Blocks (512 bytes): 23437705216 Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: Block size: 4096 Jun 03 19:13:03 preclear_disk_5A32483553365254_32761: Start sector: 512 Jun 03 19:13:04 preclear_disk_5A32483553365254_32761: Pre-Read: dd if=/dev/sdg of=/dev/null bs=2097152 skip=0 count=12000105070592 conv=notrunc,noerror iflag=nocache,count_bytes,skip_bytes Jun 03 20:50:59 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 10% read @ 209 MB/s Jun 03 20:51:21 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 10% read @ 203 MB/s Jun 03 22:30:43 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 20% read @ 201 MB/s Jun 03 22:31:30 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 20% read @ 198 MB/s Jun 04 00:13:51 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 30% read @ 190 MB/s Jun 04 00:15:08 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 30% read @ 186 MB/s Jun 04 02:01:15 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 40% read @ 180 MB/s Jun 04 02:02:57 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 40% read @ 180 MB/s Jun 04 03:54:16 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 50% read @ 173 MB/s Jun 04 03:56:26 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 50% read @ 175 MB/s Jun 04 05:54:34 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 60% read @ 153 MB/s Jun 04 05:57:13 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 60% read @ 160 MB/s Jun 04 07:25:01 preclear_disk_5A32483747533054_29410: Pause requested Jun 04 07:25:01 preclear_disk_5A32483747533054_29410: Paused Jun 04 07:25:02 preclear_disk_5A32483553365254_32761: Pause requested Jun 04 07:25:02 preclear_disk_5A32483553365254_32761: Paused Jun 04 07:37:05 preclear_disk_5A32483553365254_32761: Resumed Jun 04 07:37:05 preclear_disk_5A32483747533054_29410: Resumed Jun 04 07:43:18 preclear_disk_5A32483553365254_32761: Pause requested Jun 04 07:43:18 preclear_disk_5A32483553365254_32761: Paused Jun 04 07:43:18 preclear_disk_5A32483747533054_29410: Pause requested Jun 04 07:43:18 preclear_disk_5A32483747533054_29410: Paused Jun 04 07:43:22 preclear_disk_5A32483747533054_29410: Resumed Jun 04 07:43:23 preclear_disk_5A32483553365254_32761: Resumed Jun 04 08:16:35 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 70% read @ 151 MB/s Jun 04 08:19:44 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 70% read @ 146 MB/s Jun 04 10:40:31 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 80% read @ 130 MB/s Jun 04 10:44:13 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 80% read @ 131 MB/s Jun 04 13:24:36 preclear_disk_5A32483553365254_32761: Pre-Read: progress - 90% read @ 108 MB/s Jun 04 13:29:10 preclear_disk_5A32483747533054_29410: Pre-Read: progress - 90% read @ 109 MB/s Jun 04 15:53:29 preclear_disk_5A32483553365254_32761: Pause requested Jun 04 15:53:29 preclear_disk_5A32483553365254_32761: Paused Jun 04 15:53:29 preclear_disk_5A32483747533054_29410: Pause requested Jun 04 15:53:29 preclear_disk_5A32483747533054_29410: Paused Jun 04 15:53:31 preclear_disk_5A32483553365254_32761: Resumed Jun 04 15:53:31 preclear_disk_5A32483747533054_29410: Resumed Jun 04 15:56:59 preclear_disk_5A32483747533054_29410: Pause requested Jun 04 15:56:59 preclear_disk_5A32483747533054_29410: Paused Jun 04 15:56:59 preclear_disk_5A32483553365254_32761: Pause requested Jun 04 15:56:59 preclear_disk_5A32483553365254_32761: Paused Jun 04 15:57:03 preclear_disk_5A32483747533054_29410: Resumed Jun 04 15:57:03 preclear_disk_5A32483553365254_32761: Resumed Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: Command: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh --notify 1 --frequency 2 --cycles 1 --no-prompt /dev/sdb Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: Preclear Disk Version: 1.0.16 Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: S.M.A.R.T. info type: default Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: S.M.A.R.T. attrs type: default Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: Disk size: 4000787030016 Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: Disk blocks: 7814037168 Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: Blocks (512 bytes): 7814037168 Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: Block size: 512 Jun 04 16:13:01 preclear_disk_WD-WCC130368601_1194: Start sector: 97 Jun 04 16:13:03 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd if=/dev/sdb of=/dev/null bs=2097152 skip=0 count=4000787030016 conv=notrunc,noerror iflag=nocache,count_bytes,skip_bytes Jun 04 16:40:24 preclear_disk_5A32483553365254_32761: Pre-Read: dd - read 12000107167744 of 12000105070592. Jun 04 16:40:24 preclear_disk_5A32483553365254_32761: Pre-Read: elapsed time - 21:15:04 Jun 04 16:40:24 preclear_disk_5A32483553365254_32761: Pre-Read: dd exit code - 0 Jun 04 16:40:24 preclear_disk_5A32483553365254_32761: Zeroing: emptying the MBR. Jun 04 16:40:24 preclear_disk_5A32483553365254_32761: Zeroing: dd if=/dev/zero of=/dev/sdg bs=2097152 seek=2097152 count=12000102973440 conv=notrunc iflag=count_bytes,nocache,fullblock oflag=seek_bytes Jun 04 16:40:24 preclear_disk_5A32483553365254_32761: Zeroing: dd pid [13782] Jun 04 16:47:33 preclear_disk_5A32483747533054_29410: Pre-Read: dd - read 12000107167744 of 12000105070592. Jun 04 16:47:33 preclear_disk_5A32483747533054_29410: Pre-Read: elapsed time - 21:22:23 Jun 04 16:47:33 preclear_disk_5A32483747533054_29410: Pre-Read: dd exit code - 0 Jun 04 16:47:34 preclear_disk_5A32483747533054_29410: Zeroing: emptying the MBR. Jun 04 16:47:34 preclear_disk_5A32483747533054_29410: Zeroing: dd if=/dev/zero of=/dev/sdf bs=2097152 seek=2097152 count=12000102973440 conv=notrunc iflag=count_bytes,nocache,fullblock oflag=seek_bytes Jun 04 16:47:34 preclear_disk_5A32483747533054_29410: Zeroing: dd pid [29099] Jun 04 16:56:00 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 10% read @ 153 MB/s Jun 04 17:39:26 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 20% read @ 151 MB/s Jun 04 18:14:09 preclear_disk_5A32483553365254_32761: Zeroing: progress - 10% zeroed @ 203 MB/s Jun 04 18:21:52 preclear_disk_5A32483747533054_29410: Zeroing: progress - 10% zeroed @ 212 MB/s Jun 04 18:23:34 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 30% read @ 149 MB/s Jun 04 19:08:56 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 40% read @ 142 MB/s Jun 04 19:49:38 preclear_disk_5A32483553365254_32761: Zeroing: progress - 20% zeroed @ 212 MB/s Jun 04 19:57:35 preclear_disk_5A32483747533054_29410: Zeroing: progress - 20% zeroed @ 209 MB/s Jun 04 20:03:28 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 50% read @ 116 MB/s Jun 04 21:01:07 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 60% read @ 112 MB/s Jun 04 21:27:29 preclear_disk_5A32483553365254_32761: Zeroing: progress - 30% zeroed @ 205 MB/s Jun 04 21:35:57 preclear_disk_5A32483747533054_29410: Zeroing: progress - 30% zeroed @ 204 MB/s Jun 04 22:01:01 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 70% read @ 110 MB/s Jun 04 23:08:58 preclear_disk_5A32483553365254_32761: Zeroing: progress - 40% zeroed @ 191 MB/s Jun 04 23:10:30 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 80% read @ 110 MB/s Jun 04 23:17:33 preclear_disk_5A32483747533054_29410: Zeroing: progress - 40% zeroed @ 190 MB/s Jun 05 00:14:48 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 90% read @ 88 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.4 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.4 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: dd process hung at 3608334045184, killing.... Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Continuing disk read from byte 3608331948032 Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd if=/dev/sdb of=/dev/null bs=2097152 skip=3608331948032 count=392455081984 conv=notrunc,noerror iflag=nocache,count_bytes,skip_bytes Jun 05 00:19:17 preclear_disk_WD-WCC130368601_1194: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh: line 844: 8:06:10 + 3 : syntax error in expression (error token is ":06:10 + 3 ") Jun 05 00:19:18 preclear_disk_WD-WCC130368601_1194: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh: line 1139: 8:06:10 : syntax error in expression (error token is ":06:10 ") Jun 05 00:19:18 preclear_disk_WD-WCC130368601_1194: Preclear: total elapsed time: 8:06:17 Jun 05 00:54:59 preclear_disk_5A32483553365254_32761: Zeroing: progress - 50% zeroed @ 175 MB/s Jun 05 01:03:54 preclear_disk_5A32483747533054_29410: Zeroing: progress - 50% zeroed @ 188 MB/s Jun 05 02:47:36 preclear_disk_5A32483553365254_32761: Zeroing: progress - 60% zeroed @ 163 MB/s Jun 05 02:56:39 preclear_disk_5A32483747533054_29410: Zeroing: progress - 60% zeroed @ 167 MB/s Jun 05 04:48:33 preclear_disk_5A32483553365254_32761: Zeroing: progress - 70% zeroed @ 162 MB/s Jun 05 04:58:09 preclear_disk_5A32483747533054_29410: Zeroing: progress - 70% zeroed @ 154 MB/s Jun 05 07:02:17 preclear_disk_5A32483553365254_32761: Zeroing: progress - 80% zeroed @ 142 MB/s Jun 05 07:12:17 preclear_disk_5A32483747533054_29410: Zeroing: progress - 80% zeroed @ 145 MB/s Fri Jun 5 7:21:58 CEST 2020: preclear will be invoked as: /usr/local/sbin/preclear_disk_ori.sh -M 1 -o 1 -c 1 -J /dev/sdb Jun 05 09:33:36 preclear_disk_5A32483553365254_32761: Zeroing: progress - 90% zeroed @ 120 MB/s Jun 05 09:44:37 preclear_disk_5A32483747533054_29410: Zeroing: progress - 90% zeroed @ 121 MB/s Jun 05 12:33:58 preclear_disk_5A32483553365254_32761: Zeroing: progress - 100% zeroed @ 49 MB/s Jun 05 12:33:58 preclear_disk_5A32483553365254_32761: Zeroing: dd - wrote 12000105070592 of 12000105070592. Jun 05 12:33:58 preclear_disk_5A32483553365254_32761: Zeroing: elapsed time - 19:53:32 Jun 05 12:33:59 preclear_disk_5A32483553365254_32761: Zeroing: dd exit code - 0 Jun 05 12:33:59 preclear_disk_5A32483553365254_32761: Writing signature: 0 0 2 0 0 255 255 255 1 0 0 0 255 255 255 255 Jun 05 12:34:00 preclear_disk_5A32483553365254_32761: Post-Read: verifying the beggining of the disk. Jun 05 12:34:00 preclear_disk_5A32483553365254_32761: Post-Read: cmp /tmp/.preclear/sdg/fifo /dev/zero Jun 05 12:34:00 preclear_disk_5A32483553365254_32761: Post-Read: dd if=/dev/sdg of=/tmp/.preclear/sdg/fifo count=2096640 skip=512 conv=notrunc iflag=nocache,count_bytes,skip_bytes Jun 05 12:34:01 preclear_disk_5A32483553365254_32761: Post-Read: verifying the rest of the disk. Jun 05 12:34:01 preclear_disk_5A32483553365254_32761: Post-Read: cmp /tmp/.preclear/sdg/fifo /dev/zero Jun 05 12:34:01 preclear_disk_5A32483553365254_32761: Post-Read: dd if=/dev/sdg of=/tmp/.preclear/sdg/fifo bs=2097152 skip=2097152 count=12000102973440 conv=notrunc iflag=nocache,count_bytes,skip_bytes Jun 05 12:47:01 preclear_disk_5A32483747533054_29410: Zeroing: dd - wrote 12000105070592 of 12000105070592. Jun 05 12:47:01 preclear_disk_5A32483747533054_29410: Zeroing: elapsed time - 19:59:26 Jun 05 12:47:02 preclear_disk_5A32483747533054_29410: Zeroing: dd exit code - 0 Jun 05 12:47:03 preclear_disk_5A32483747533054_29410: Writing signature: 0 0 2 0 0 255 255 255 1 0 0 0 255 255 255 255 Jun 05 12:47:03 preclear_disk_5A32483747533054_29410: Post-Read: verifying the beggining of the disk. Jun 05 12:47:04 preclear_disk_5A32483747533054_29410: Post-Read: cmp /tmp/.preclear/sdf/fifo /d And the "Download Log" button on "/Tools/Preclear" takes me to an empty page ("/log/NAS-preclear.disk-20200605-1457.zip") and no download starts...

Thanks for your answer. Strangely, the extended SMART test finished without errors. But a preclear I ran afterwards, died because of syntax errors after some reading errors: Jun 05 00:14:48 preclear_disk_WD-WCC130368601_1194: Pre-Read: progress - 90% read @ 88 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.4 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.4 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: dd: error reading '/dev/sdb': Input/output error Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records in Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 1718084+11636 records out Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd output: 3608331948032 bytes (3.6 TB, 3.3 TiB) copied, 29171.5 s, 124 MB/s Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: dd process hung at 3608334045184, killing.... Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Continuing disk read from byte 3608331948032 Jun 05 00:19:14 preclear_disk_WD-WCC130368601_1194: Pre-Read: dd if=/dev/sdb of=/dev/null bs=2097152 skip=3608331948032 count=392455081984 conv=notrunc,noerror iflag=nocache,count_bytes,skip_bytes Jun 05 00:19:17 preclear_disk_WD-WCC130368601_1194: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh: line 844: 8:06:10 + 3 : syntax error in expression (error token is ":06:10 + 3 ") Jun 05 00:19:18 preclear_disk_WD-WCC130368601_1194: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh: line 1139: 8:06:10 : syntax error in expression (error token is ":06:10 ") Jun 05 00:19:18 preclear_disk_WD-WCC130368601_1194: Preclear: total elapsed time: 8:06:17

Hi, I am new to unraid and wasn't experienced with disks. Recently I wanted to add a parity disk to my data-disks-only-array. While building the parity, unraid reported a massive amount of read errors (More than 600,000) on Disk 2 (Error column in the main GUI). Because I have read that this is often caused by cabling, I changed and switched the SATA cables multiple times. But the read errors didn't go away. So the drive is probably faulty. Meanwhile I already found several "dead" files. At the moment I am rescuing the readable data with unBALANCE to another disk. But this is strange: While other people with read errors usually have pending sectors or something like that in their SMART reports, mine seems to be ok. The disk has a bad "UDMA CRC error count" but if I googled right, this is not really problematic. Can I fix the disk somehow or do I have to bin it? I have attached the diagnostics (Downloaded after the read errors happened) All disks are from ebay ("Refurbished") and have never been precleared. I will do this as soon as possible, maybe they are faulty too... And I have ordered brand new ones. nas-diagnostics-20200601-1043.zip