December 13th, 2021, 13:33
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE
1 Raw_Read_Error_Rate POSR-K 134 134 051 - 2175
3 Spin_Up_Time POS--K 189 185 021 - 5508
4 Start_Stop_Count -O--CK 100 100 000 - 109
5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0
7 Seek_Error_Rate -OSR-K 200 200 000 - 0
9 Power_On_Hours -O--CK 100 100 000 - 179
10 Spin_Retry_Count -O--CK 100 100 000 - 0
11 Calibration_Retry_Count -O--CK 100 253 000 - 0
12 Power_Cycle_Count -O--CK 100 100 000 - 70
192 Power-Off_Retract_Count -O--CK 200 200 000 - 64
193 Load_Cycle_Count -O--CK 200 200 000 - 2287
194 Temperature_Celsius -O---K 129 098 000 - 23
196 Reallocated_Event_Count -O--CK 200 200 000 - 0
197 Current_Pending_Sector -O--CK 200 200 000 - 0
198 Offline_Uncorrectable ----CK 100 253 000 - 0
199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 0
200 Multi_Zone_Error_Rate ---R-- 100 253 000 - 0
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE
1 Raw_Read_Error_Rate POSR-K 001 001 051 NOW 65535
3 Spin_Up_Time POS--K 192 185 021 - 5375
4 Start_Stop_Count -O--CK 100 100 000 - 110
5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0
7 Seek_Error_Rate -OSR-K 200 200 000 - 0
9 Power_On_Hours -O--CK 100 100 000 - 213
10 Spin_Retry_Count -O--CK 100 100 000 - 0
11 Calibration_Retry_Count -O--CK 100 253 000 - 0
12 Power_Cycle_Count -O--CK 100 100 000 - 70
192 Power-Off_Retract_Count -O--CK 200 200 000 - 64
193 Load_Cycle_Count -O--CK 200 200 000 - 2290
194 Temperature_Celsius -O---K 111 098 000 - 41
196 Reallocated_Event_Count -O--CK 200 200 000 - 0
197 Current_Pending_Sector -O--CK 200 200 000 - 5
198 Offline_Uncorrectable ----CK 100 253 000 - 0
199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 0
200 Multi_Zone_Error_Rate ---R-- 100 253 000 - 0
Raw_Read_Error_Rate - Stores data related to 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. For some drives, this number may increase during normal operation without necessarily signifying errors.
Current_Pending_Sector - Count of "unstable" sectors (waiting to be remapped, because of unrecoverable read errors). If an unstable sector is subsequently read successfully, the sector is remapped and this value is decreased.
December 14th, 2021, 4:42
December 15th, 2021, 16:58
maximus wrote:.
December 18th, 2021, 18:48
I've never seen this message. Keep on hiding the log!iklazusf wrote:Drive is now powered off until I get a new drive so I can ddrescue the whole thing, since that still looks it will be the less aggressive way to get the data. My biggest concern is the mapping of any bad blocks to filesystem but maybe I'm lucky and will be able to recover 100%
However I'm confused about what has happened as I was using ddrescue at a file level. Which if I understood correctly uses the OK/kernel but just retries things a few times before failing.
smartclt shows there have been 13 read errors. These are visible in the log and also show accounted for as Current_Pending_Sector.
Conversely there are been 13 errors reported by the kernel.
However I don't understand a few things:
1) Why don't the reported bad/unreadable sectors match?
For example:
smartctl says Error: UNC 256 sectors at LBA = 0xacb60238 = 2897609272
Why should they? How is this related?
While the kernel says blk_update_request: critical medium error, dev sdb, sector 2897609216 op 0x0:(READ) flags 0x80700 phys_seg 16 prio class 0
Could be, depending on the command given to the drive.
2) How many bytes of data does each error results in being lost?
From smartctl : Sector Sizes: 512 bytes logical, 4096 bytes physical
So from the above: 256 sectors * 512 bytes = 131072 bytes! Is this correct? Or was it only a single sector: 512 bytes?
Wrong conclusion. If I break into your house, your wife hears me, says "go see where the invader is" and the only thing you do is looking in the entrance hall while I hide in your cave, would you ask your wife "Did you really hear an invader?".
3) Was there really an unrecoverable error?
I used ddrescue with the mapfile option. However at the end of the execution it stated that all data had been copied. The files in question are video files and so far I wasn't able to detect any visible corruption. Either corruption is minimal (eg: 512 bytes) or non existent at all.
January 16th, 2022, 11:20
January 19th, 2022, 7:58
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