January 26, 201610 yr All, I ran the preclear script on a spare Seagate 1TB drive 3 times, and I consistently get these results: ================================================================== 1.15 = unRAID server Pre-Clear disk /dev/sdh = cycle 1 of 1, partition start on sector 63 = = 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: 28C, Elapsed Time: 9:19:22 ========================================================================1.15 == ST31000528AS 6VP240NB == Disk /dev/sdh has been successfully precleared == with a starting sector of 63 ============================================================================ ** Changed attributes in files: /tmp/smart_start_sdh /tmp/smart_finish_sdh ATTRIBUTE NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS RAW_VALUE Raw_Read_Error_Rate = 109 118 6 ok 23022699 Seek_Error_Rate = 65 64 30 ok 3226584 Spin_Retry_Count = 100 100 97 near_thresh 0 End-to-End_Error = 100 100 99 near_thresh 0 Airflow_Temperature_Cel = 72 73 45 ok 28 Temperature_Celsius = 28 27 0 ok 28 Hardware_ECC_Recovered = 45 44 0 ok 23022699 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 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. 1067 sectors had been re-allocated before the start of the preclear. 1067 sectors are re-allocated at the end of the preclear, the number of sectors re-allocated did not change. root@Tower:/usr/local/emhttp# It consistently reports those 1067 sectors. Is this drive OK to use? Larry
January 26, 201610 yr Community Expert In theory if the number of reallocated sectors stays constant it is safe to use. However I would be very wary with such a high number of reallocated sectors. I personally would not use it the array although I might be happy to add it to use it as a backup disk. If you do decide to use it in the array make sure that you have notifications turned on so that you get proactively alerted if the value degrades.
January 26, 201610 yr Author In theory if the number of reallocated sectors stays constant it is safe to use. However I would be very wary with such a high number of reallocated sectors. I personally would not use it the array although I might be happy to add it to use it as a backup disk. If you do decide to use it in the array make sure that you have notifications turned on so that you get proactively alerted if the value degrades. Thanks. I think I'll play it safe and use this drive for something else.
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