November 2, 20169 yr So i had two drives with 1 pending reallocated sector so i replaced them and had them rebuilt one had the issue first then the following week i had the second drive these are 5 year old drives. After the rebuild i ran the preclear on them and got these results wondering if they're worth using at all in any type of environment. Thanks in adavance. ================================================================== 1.15b = unRAID server Pre-Clear disk /dev/sdi = cycle 1 of 1, partition start on sector 64 = Disk Pre-Clear-Read completed DONE = Step 1 of 10 - Copying zeros to first 2048k bytes DONE = Step 2 of 10 - Copying zeros to remainder of disk to clear it DONE = Step 3 of 10 - Disk is now cleared from MBR onward. DONE = Step 4 of 10 - Clearing MBR bytes for partition 2,3 & 4 DONE = Step 5 of 10 - Clearing MBR code area DONE = Step 6 of 10 - Setting MBR signature bytes DONE = Step 7 of 10 - Setting partition 1 to precleared state DONE = Step 8 of 10 - Notifying kernel we changed the partitioning DONE = Step 9 of 10 - Creating the /dev/disk/by* entries DONE = Step 10 of 10 - Verifying if the MBR is cleared. DONE = Disk Post-Clear-Read completed DONE Disk Temperature: 31C, Elapsed Time: 19:39:02 ========================================================================1.15b == WDCWD20EARS-00MVWB0 WD-WMAZA3209988 == Disk /dev/sdi has been successfully precleared == with a starting sector of 64 ============================================================================ ** Changed attributes in files: /tmp/smart_start_sdi /tmp/smart_finish_sdi ATTRIBUTE NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS RAW_VALUE Temperature_Celsius = 119 120 0 ok 31 No SMART attributes are FAILING_NOW 0 sectors were pending re-allocation before the start of the preclear. 0 sectors were pending re-allocation after pre-read in cycle 1 of 1. 0 sectors were pending re-allocation after zero of disk in cycle 1 of 1. 0 sectors are pending re-allocation at the end of the preclear, the number of sectors pending re-allocation did not change. 1 sector had been re-allocated before the start of the preclear. 1 sector is re-allocated at the end of the preclear, the number of sectors re-allocated did not change. root@Tower:/usr/local/emhttp# ================================================================== 1.15b = unRAID server Pre-Clear disk /dev/sdo = cycle 1 of 1, partition start on sector 64 = Disk Pre-Clear-Read completed DONE = Step 1 of 10 - Copying zeros to first 2048k bytes DONE = Step 2 of 10 - Copying zeros to remainder of disk to clear it DONE = Step 3 of 10 - Disk is now cleared from MBR onward. DONE = Step 4 of 10 - Clearing MBR bytes for partition 2,3 & 4 DONE = Step 5 of 10 - Clearing MBR code area DONE = Step 6 of 10 - Setting MBR signature bytes DONE = Step 7 of 10 - Setting partition 1 to precleared state DONE = Step 8 of 10 - Notifying kernel we changed the partitioning DONE = Step 9 of 10 - Creating the /dev/disk/by* entries DONE = Step 10 of 10 - Verifying if the MBR is cleared. DONE = Disk Post-Clear-Read completed DONE Disk Temperature: 33C, Elapsed Time: 20:32:16 ========================================================================1.15b == WDCWD20EARS-00MVWB0 WD-WMAZA2751951 == Disk /dev/sdo has been successfully precleared == with a starting sector of 64 ============================================================================ ** Changed attributes in files: /tmp/smart_start_sdo /tmp/smart_finish_sdo ATTRIBUTE NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS RAW_VALUE Raw_Read_Error_Rate = 195 197 51 ok 13440 Seek_Error_Rate = 100 200 0 ok 0 Temperature_Celsius = 117 121 0 ok 33 No SMART attributes are FAILING_NOW 1 sector was pending re-allocation before the start of the preclear. 1 sector was pending re-allocation after pre-read in cycle 1 of 1. 0 sectors were pending re-allocation after zero of disk in cycle 1 of 1. 0 sectors are pending re-allocation at the end of the preclear, a change of -1 in the number of sectors pending re-allocation. 0 sectors had been re-allocated before the start of the preclear. 0 sectors are re-allocated at the end of the preclear, the number of sectors re-allocated did not change. root@Tower:/usr/local/emhttp#
November 2, 20169 yr The first one is fine. The second one had a recent bad sector, which this Preclear fixed. To be safe, I'd run one more Preclear on it, and check for perfection again.
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