November 13, 201015 yr I am not sure what to think of the preclear script output on a new 2TB drive.... Are these errors relatively benign, or should the drive be RMAed. More in general, is there some sort of smart-for-dummies resource I should be looking at? thanks =========================================================================== = unRAID server Pre-Clear disk /dev/sdk = cycle 1 of 1 = 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 - Testing if the clear has been successful. DONE = Disk Post-Clear-Read completed DONE Disk Temperature: 28C, Elapsed Time: 28:55:58 ============================================================================ == == Disk /dev/sdk has been successfully precleared == ============================================================================ S.M.A.R.T. error count differences detected after pre-clear note, some 'raw' values may change, but not be an indication of a problem 54c54 < 1 Raw_Read_Error_Rate 0x000f 100 100 006 Pre-fail Always - 8858 --- > 1 Raw_Read_Error_Rate 0x000f 119 100 006 Pre-fail Always - 215132998 58c58 < 7 Seek_Error_Rate 0x000f 100 253 030 Pre-fail Always - 47 --- > 7 Seek_Error_Rate 0x000f 100 253 030 Pre-fail Always - 239267 64c64 < 188 Unknown_Attribute 0x0032 100 253 000 Old_age Always - 0 --- > 188 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 0 66,67c66,67 < 190 Airflow_Temperature_Cel 0x0022 076 072 045 Old_age Always - 24 (Lifetime Min/Max 20/24) < 195 Hardware_ECC_Recovered 0x001a 100 100 000 Old_age Always --- > 190 Airflow_Temperature_Cel 0x0022 072 071 045 Old_age Always - 28 (Lifetime Min/Max 20/29) > 195 Hardware_ECC_Recovered 0x001a 050 044 000 Old_age Always 70,73c70,73 < 199 UDMA_CRC_Error_Count 0x003e 200 253 000 Old_age Always - 0 < 240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 208859964637188 < 241 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 0 < 242 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 1632 --- > 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 > 240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 75217762254881 > 241 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 4195964891 > 242 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 3796633323 ============================================================================
November 13, 201015 yr You have to be very careful about reading that output. Not everything in that report is an error. Basically, it is showing you some parameters before and after the preclear finished so you can compare the values and determine if there was any change. The only items of interest really are the Error_rates, which started with 100 or higher and finished at 100 (first column of numbers). The second column is the max lifetime and the third is the fail point. Your drive looks fine, just a little more chatty with its condition than most. If you're worried about that ECC_Recovered code, here is an excerpt from the Wikipedia entry on S.M.A.R.T. values: ID Attribute name Description 195 Hardware ECC Recovered The raw value has different structure for different vendors and is often not meaningful as a decimal number. I'll accompany this with my usual disclaimer of "I'm no expert" and let Joe or one of the other guys correct me if / where I'm wrong.
November 13, 201015 yr The 253 values are those the manufacturer uses when a drive is from the factory. The 100 values are those assigned when a drive is first put into use by you. nothing looks abnormal at all. This is a perfectly working drive. As far as interpreting the output, look to the wiki: http://en.wikipedia.org/wiki/S.M.A.R.T. The numbers in the "RAW" column are typically only meaningful to the manufacturer... The few exceptions are temperature, re-allocated sectors, and sectors pending re-allocation.
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