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USB drive giving smartd device error, "Currently unreadable (pending) sectors"

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My USB drive with a load of big video files is filling the Ubuntu syslog with smartd messages every 30 minutes - this has been going on for at least a month.

However the drive operates fine, allowing me to write new video files and play back existing ones without a hitch.

This is the log:

Sep  2 13:42:33 localhost smartd[1304]: Device: /dev/sdb [SAT], 1 Currently unreadable (pending) sectors
Sep  2 13:42:33 localhost smartd[1304]: Device: /dev/sdb [SAT], SMART Usage Attribute: 194 Temperature_Celsius changed from 109 to 110

The second log entry appears only about 50% as much as the 'unreadable' entry. How can the temperature be so high? It doesn't feel hot to touch. A bit warm but not hot.

Can I do anything to get rid of the 'unreadable' warning / error?

adam@gondolin:~$ sudo smartctl -q noserial -a /dev/sdb
[sudo] password for adam: 
smartctl 7.2 2020-12-30 r5155 [x86_64-linux-5.15.0-52-generic] (local build)
Copyright (C) 2002-20, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Elements / My Passport (USB, AF)
Device Model:     WDC WD20NMVW-11AV3S2
Firmware Version: 01.01A01
User Capacity:    2,000,365,380,096 bytes [2.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5200 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2 (minor revision not indicated)
SATA Version is:  SATA 3.0, 3.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Fri Oct 21 12:30:29 2022 BST
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:        (36660) seconds.
Offline data collection
capabilities:            (0x7b) SMART execute Offline immediate.
                    Auto Offline data collection on/off support.
                    Suspend Offline collection upon new
                    command.
                    Offline surface scan supported.
                    Self-test supported.
                    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:    ( 404) minutes.
Conveyance self-test routine
recommended polling time:    (   5) minutes.
SCT capabilities:          (0x7035) SCT Status 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   200   200   051    Pre-fail  Always       -       1
  3 Spin_Up_Time            0x0027   204   202   021    Pre-fail  Always       -       4791
  4 Start_Stop_Count        0x0032   096   096   000    Old_age   Always       -       4068
  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   029   029   000    Old_age   Always       -       51872
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   100   100   000    Old_age   Always       -       187
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       144
193 Load_Cycle_Count        0x0032   187   187   000    Old_age   Always       -       41310
194 Temperature_Celsius     0x0022   114   088   000    Old_age   Always       -       38
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       1
198 Offline_Uncorrectable   0x0030   100   253   000    Old_age   Offline      -       0
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      -       0

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num  Test_Description    Status                  Remaining  LifeTime(hours)  LBA_of_first_error
# 1  Extended offline    Completed without error       00%     51834         -
# 2  Extended captive    Interrupted (host reset)      90%     51827         -
# 3  Short offline       Completed without error       00%     51827         -

SMART Selective self-test log data structure revision number 1
 SPAN  MIN_LBA  MAX_LBA  CURRENT_TEST_STATUS
    1        0        0  Not_testing
    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.

I don't get any errors showing in smartctl -t long /dev/sdb

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