So far after pre clearing probably over 30 drives, I have never had one fail, today one did. What does this log mean?

 

Nov 30 16:22:22 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 40% zeroed
Nov 30 16:52:31 preclear_disk_ZCT13WYW_28571: smartctl exec_time: 1s
Nov 30 17:06:19 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 45% zeroed
Nov 30 17:50:53 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 50% zeroed
Nov 30 18:36:15 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 55% zeroed
Nov 30 19:22:08 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 60% zeroed
Nov 30 20:09:00 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 65% zeroed
Nov 30 21:00:23 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 70% zeroed
Nov 30 21:52:53 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 75% zeroed
Nov 30 22:48:28 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 80% zeroed
Nov 30 22:55:03 preclear_disk_ZCT13WYW_28571: smartctl exec_time: 2s
Nov 30 23:46:46 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 85% zeroed
Nov 30 23:55:33 preclear_disk_ZCT13WYW_28571: smartctl exec_time: 1s
Dec 01 00:25:52 preclear_disk_ZCT13WYW_28571: smartctl exec_time: 1s
Dec 01 00:48:56 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 90% zeroed
Dec 01 01:56:20 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 95% zeroed
Dec 01 03:11:57 preclear_disk_ZCT13WYW_28571: Zeroing: progress - 100% zeroed
Dec 01 03:11:57 preclear_disk_ZCT13WYW_28571: Zeroing: dd - wrote 8001563221504 of 8001563221504.
Dec 01 03:11:58 preclear_disk_ZCT13WYW_28571: Zeroing: dd exit code - 0
Dec 01 03:12:02 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 5 Reallocated_Sector_Ct 0
Dec 01 03:12:02 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 9 Power_On_Hours 32
Dec 01 03:12:02 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 183 Runtime_Bad_Block 0
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 184 End-to-End_Error 0
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 187 Reported_Uncorrect 0
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 190 Airflow_Temperature_Cel 46
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 197 Current_Pending_Sector 0
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 198 Offline_Uncorrectable 0
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: S.M.A.R.T.: 199 UDMA_CRC_Error_Count 0
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sd 8:0:0:0: [sdl] Spinning up disk...
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sd 8:0:0:0: [sdl] Very big device. Trying to use READ CAPACITY(16).
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sd 8:0:0:0: [sdl] 15628053167 512-byte logical blocks: (8.00 TB/7.28 TiB)
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sd 8:0:0:0: [sdl] 2048-byte physical blocks
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sd 8:0:0:0: [sdl] Write Protect is off
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sd 8:0:0:0: [sdl] Mode Sense: 4f 00 00 00
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sd 8:0:0:0: [sdl] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sdl: sdl1 sdl2
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: sd 8:0:0:0: [sdl] Attached SCSI disk
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: Command: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh --notify 2 --frequency 1 --cycles 1 --no-prompt /dev/sdl
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: Pre-Read: dd if=/dev/sdl of=/dev/null bs=2097152 skip=0 count=8001563221504 conv=notrunc iflag=nocache,count_bytes,skip_bytes
Dec 01 03:12:03 preclear_disk_ZCT13WYW_28571: syslog: Zeroing: dd if=/dev/zero of=/dev/sdl bs=2097152 seek=2097152 count=8001561124352 conv=notrunc iflag=count_bytes,nocache,fullblock oflag=seek_bytes

 

You should post on the plugin support thread instead.