Hi,
I'm trying to determine if a hard disk someone gave to me is reliable enough to use. It's a WDC WD4000F9YZ-09N20L0 (4TB Western Digital Enterprise). The drive originally had the following SMART stats:
Code:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 199 199 051 Pre-fail Always - 80
3 Spin_Up_Time 0x0027 184 184 021 Pre-fail Always - 9766
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 92
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 084 084 000 Old_age Always - 11768
10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 92
183 Runtime_Bad_Block 0x0032 095 095 000 Old_age Always - 5
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 64
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 27
194 Temperature_Celsius 0x0022 116 097 000 Old_age Always - 36
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 16
198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 20
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 33
I decided the first thing I would do with it was run badblocks (linux) on it as an easy way to write the entire drive a couple times. If it's going to die, I wanted to kill it right away. After the first write pass (badblocks -svw) the SMART stats related to reallocation changed. Nothing changed during the second pass. Now it looks like this:
Code:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 200 198 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 184 184 021 Pre-fail Always - 9766
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 92
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 084 084 000 Old_age Always - 11795
10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0
11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 92
183 Runtime_Bad_Block 0x0032 095 095 000 Old_age Always - 5
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 64
193 Load_Cycle_Count 0x0032 200 200 000 Old_age Always - 28
194 Temperature_Celsius 0x0022 105 097 000 Old_age Always - 47
196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 20
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 33
I understand how pending reallocation works., but I don't understand what Offline_Uncorrectable is indicating. So, I have a couple questions.
1) What exactly is Offline_Uncorrectable?
2) Is it possible for that value to decrease? Under what circumstances would this happen?
The only other thing noteworthy thing I've seen so far is that I have 2 of these disks and started running badblocks at exactly the same time. The above disk has been running slightly slower that the other. It's approximately 3% behind the other which is (very roughly) 15-20 minutes of work.
Any thoughts?
Ryan
P.S. I like your posting guidelines
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