serait-il possible d'avoir quelques éclaircissement sur un retour de smartctl?
je vois un résultat  
Raw_Read_Error_Rate     0x002f   100   100   051    Pre-fail  Always       -       4977
 qui tendrait a indiquer un problème de surface du disque ou de tetes de lecture. mais dans quel mesure ce résultat est bon, moyen, bof, gravement nul?
idem pour 
Spin_Up_Time            0x0023   045   045   025    Pre-fail  Always       -       16748
pre-fail signifiant qu'il n'est plus fiable et qu'il est "en sursis"?
je précise que je n'arrive plus à le lire et que qu'il est indiqué comme inconnu...
merci de vos explications
lui@lui:~$ sudo smartctl -a /dev/sdb
smartctl 6.6 2016-05-31 r4324 [x86_64-linux-4.15.0-136-generic] (local build)
Copyright (C) 2002-16, Bruce Allen, Christian Franke, www.smartmontools.org
3 
=== START OF INFORMATION SECTION ===
Model Family:     Seagate Samsung SpinPoint M8 (AF)
Device Model:     ST1000LM024 HN-M101MBB
Serial Number:    S2RXJ9BCA18121
LU WWN Device Id: 5 0004cf 208bef590
Firmware Version: 2AR10002
User Capacity:    1000204886016 bytes [1,00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5400 rpm
Form Factor:      2.5 inches
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ATA8-ACS T13/1699-D revision 6
SATA Version is:  SATA 3.0, 3.0 Gb/s (current: 1.5 Gb/s)
Local Time is:    Wed Mar  3 17:07:07 2021 -10
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART Status not supported: Incomplete response, ATA output registers missing
SMART overall-health self-assessment test result: PASSED
Warning: This result is based on an Attribute check.
General SMART Values:
Offline data collection status:  (0x00)	Offline data collection activity
					was never started.
					Auto Offline Data Collection: Disabled.
Self-test execution status:      (   0)	The previous self-test routine completed
					without error or no self-test has ever 
					been run.
Total time to complete Offline 
data collection: 		(13200) seconds.
Offline data collection
capabilities: 			 (0x5b) SMART execute Offline immediate.
					Auto Offline data collection on/off support.
					Suspend Offline collection upon new
					command.
					Offline surface scan supported.
					Self-test supported.
					No Conveyance Self-test supported.
					Selective Self-test supported.
SMART capabilities:            (0x0003)	Saves SMART data before entering
					power-saving mode.
					Supports SMART auto save timer.
Error logging capability:        (0x01)	Error logging supported.
					General Purpose Logging supported.
Short self-test routine 
recommended polling time: 	 (   2) minutes.
Extended self-test routine
recommended polling time: 	 ( 220) minutes.
SCT capabilities: 	       (0x003f)	SCT Status supported.
					SCT Error Recovery Control supported.
					SCT Feature Control supported.
					SCT Data Table supported.
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   100   100   051    Pre-fail  Always       -       4977
  2 Throughput_Performance  0x0026   252   252   000    Old_age   Always       -       0
  3 Spin_Up_Time            0x0023   045   045   025    Pre-fail  Always       -       16748
  4 Start_Stop_Count        0x0032   099   099   000    Old_age   Always       -       1574
  5 Reallocated_Sector_Ct   0x0033   252   252   010    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   252   252   051    Old_age   Always       -       0
  8 Seek_Time_Performance   0x0024   252   252   015    Old_age   Offline      -       0
  9 Power_On_Hours          0x0032   100   100   000    Old_age   Always       -       3923
 10 Spin_Retry_Count        0x0032   252   252   051    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       17
 12 Power_Cycle_Count       0x0032   098   098   000    Old_age   Always       -       2162
191 G-Sense_Error_Rate      0x0022   100   100   000    Old_age   Always       -       31
192 Power-Off_Retract_Count 0x0022   252   252   000    Old_age   Always       -       0
194 Temperature_Celsius     0x0002   064   054   000    Old_age   Always       -       34 (Min/Max 24/76)
195 Hardware_ECC_Recovered  0x003a   100   100   000    Old_age   Always       -       0
196 Reallocated_Event_Count 0x0032   252   252   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   252   252   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   252   252   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0036   100   100   000    Old_age   Always       -       10
200 Multi_Zone_Error_Rate   0x002a   100   100   000    Old_age   Always       -       15
223 Load_Retry_Count        0x0032   100   100   000    Old_age   Always       -       17
225 Load_Cycle_Count        0x0032   096   096   000    Old_age   Always       -       42908
SMART Error Log Version: 1
No Errors Logged
SMART Self-test log structure revision number 1
No self-tests have been logged.  [To run self-tests, use: smartctl -t]
SMART Selective self-test log data structure revision number 0
Note: revision number not 1 implies that no selective self-test has ever been run
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Completed [00% left] (0-65535)
    2        0        0  Not_testing
    3        0        0  Not_testing
    4        0        0  Not_testing
    5        0        0  Not_testing
Selective self-test flags (0x0):
  After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.
lui@lui:~$