April 26, 201016 yr I know I am worrisome over the SMART table outputs after running preclear, but some of the values look bad in my uneducated opinion (those in the last column....) Brand new 2 TB Seagate, retail.... ======================================================================= == == Disk /dev/sdg 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 - 30610 --- > 1 Raw_Read_Error_Rate 0x000f 119 100 006 Pre-fail Always - 207738410 58c58 < 7 Seek_Error_Rate 0x000f 100 253 030 Pre-fail Always - 18 --- > 7 Seek_Error_Rate 0x000f 100 253 030 Pre-fail Always - 469544 64,67c64,67 < 188 Unknown_Attribute 0x0032 100 253 000 Old_age Always - 0 < 189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0 < 190 Airflow_Temperature_Cel 0x0022 071 071 045 Old_age Always - 29 (Lifetime Min/Max 24/29) < 195 Hardware_ECC_Recovered 0x001a 100 100 000 Old_age Always --- > 188 Unknown_Attribute 0x0032 100 100 000 Old_age Always - 0 > 189 High_Fly_Writes 0x003a 099 099 000 Old_age Always - 1 > 190 Airflow_Temperature_Cel 0x0022 066 065 045 Old_age Always - 34 (Lifetime Min/Max 24/35) > 195 Hardware_ECC_Recovered 0x001a 050 048 000 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 - 82987358093319 < 241 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 0 < 242 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 1780 --- > 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 > 240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 30047591202843 > 241 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 648355664 > 242 Unknown_Attribute 0x0000 100 253 000 Old_age Offline - 3566995329 the last column of the first two Raw_Read_Error_Rate entries have always been 0 for other drives. should I worry about this? it says successfully precleared, so maybe I am worrying for nothing. (this is going to be my new parity drive). thanks for any help, c+h
April 26, 201016 yr Two of the items concern me: Raw_Read_Error_Rate and Seek_Error_Rate. Your post-clear report looks obscenely high. Perhaps Joe L knows better what to expect from Seagate drives. Before: 1 Raw_Read_Error_Rate 0x000f 100 100 006 Pre-fail Always - 30610 7 Seek_Error_Rate 0x000f 100 253 030 Pre-fail Always - 18 After: 1 Raw_Read_Error_Rate 0x000f 119 100 006 Pre-fail Always - 207738410 7 Seek_Error_Rate 0x000f 100 253 030 Pre-fail Always - 469544 According to Wikipedia [ http://en.wikipedia.org/wiki/S.M.A.R.T. ] Read Error Rate Indicates the rate of hardware read errors that occurred when reading data from a disk surface. The raw value has different structure for different vendors and is often not meaningful as a decimal number. Seek Error Rate Rate of seek errors of the magnetic heads. If there is a partial failure in the mechanical positioning system, then seek errors will arise. Such a failure may be due to numerous factors, such as damage to a servo, or thermal widening of the hard disk. The raw value has different structure for different vendors and is often not meaningful as a decimal number.
April 26, 201016 yr Your normalized value for seek error rate is 100. It was 100 prior to the pre-clearing. (100 seems to be the starting value for this model drive once it starts being used at all. The 253 shown in the "worst value" column is the value given at the factor as the pre-initialization value.) The threshold to consider a drive having failed is 30. Your normalized value did not change after the pre-clearing. It is still 100. As mentioned, the last column can be ignored in the report. There are very few attributes where it is humanly readable. (Typically temperature, re-allocated sectors, and sectors pending re-allocation) All the other "raw values" have meaning only to the manufacturer, and they aren't telling anybody how to interpret them, as it is their trade secret. In the same way, the raw-read-error-rate "starting value" of 100 increased to 119. (It is BETTER after the pre-clearing than before it) It has a failure threshold of 6 and your disk is apparently performing better than average as the current value is better at the end of the pre-clear cycle than at the beginning. Enjoy your new disk. These numbers do not imply the disk is going to last forever, but they are certainly indications it is working well now. If it got through the pre-clearing, odds are in your favor if it not failing as you start to load data onto it. Joe L.
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