Came home over lunch and ran a few commands, but using -p and -t shows nothing, but just straight up sudo journalctl -u media-fil\\x2dfitt.mount
I found:
Nov 01 17:36:02 bednaManjaro systemd[1]: Mounting File drive (fil-fitt)...
Nov 01 17:36:04 bednaManjaro systemd[1]: Mounted File drive (fil-fitt).
Nov 02 00:27:22 bednaManjaro systemd[1]: Unmounting File drive (fil-fitt)...
Nov 02 00:27:22 bednaManjaro umount[39579]: umount: /media/fil-fitt: target is busy.
Nov 02 00:27:22 bednaManjaro systemd[1]: media-fil\x2dfitt.mount: Mount process exited, code=exited, status=32/n/a
Nov 02 00:27:22 bednaManjaro systemd[1]: Failed unmounting File drive (fil-fitt).
How do I find out WHAT is using it so it’s “busy”?
I cant find any reference in dmesg to this drive. 
I am no expert in using smartctl but here is the output:
sudo smartctl -a /dev/sdb3 ✔
smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.6.0-2-MANJARO] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Red
Device Model: WDC WD30EFRX-68EUZN0
Serial Number: WD-WMC4N1849844
LU WWN Device Id: 5 0014ee 0ae676016
Firmware Version: 80.00A80
User Capacity: 3 000 592 982 016 bytes [3,00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Device is: In smartctl database 7.3/5528
ATA Version is: ACS-2 (minor revision not indicated)
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Thu Nov 2 12:33:47 2023 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
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: (41280) 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: ( 414) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x703d) 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 200 200 051 Pre-fail Always - 0
3 Spin_Up_Time 0x0027 161 161 021 Pre-fail Always - 6916
4 Start_Stop_Count 0x0032 083 083 000 Old_age Always - 17934
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 001 001 000 Old_age Always - 78560
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 099 099 000 Old_age Always - 1129
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 137
193 Load_Cycle_Count 0x0032 176 176 000 Old_age Always - 72060
194 Temperature_Celsius 0x0022 123 106 000 Old_age Always - 27
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 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 100 253 000 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 Short offline Completed without error 00% 11232 -
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.
The above only provides legacy SMART information - try 'smartctl -x' for more
But I just realized that there is an -x tag, because I’m an idiot, so:
sudo smartctl -x /dev/sdb3 ✔
smartctl 7.4 2023-08-01 r5530 [x86_64-linux-6.6.0-2-MANJARO] (local build)
Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org
=== START OF INFORMATION SECTION ===
Model Family: Western Digital Red
Device Model: WDC WD30EFRX-68EUZN0
Serial Number: WD-WMC4N1849844
LU WWN Device Id: 5 0014ee 0ae676016
Firmware Version: 80.00A80
User Capacity: 3 000 592 982 016 bytes [3,00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Device is: In smartctl database 7.3/5528
ATA Version is: ACS-2 (minor revision not indicated)
SATA Version is: SATA 3.0, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Thu Nov 2 12:34:27 2023 CET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
AAM feature is: Unavailable
APM feature is: Unavailable
Rd look-ahead is: Enabled
Write cache is: Enabled
DSN feature is: Unavailable
ATA Security is: Disabled, frozen [SEC2]
Wt Cache Reorder: Enabled
=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED
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: (41280) 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: ( 414) minutes.
Conveyance self-test routine
recommended polling time: ( 5) minutes.
SCT capabilities: (0x703d) 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 FLAGS VALUE WORST THRESH FAIL RAW_VALUE
1 Raw_Read_Error_Rate POSR-K 200 200 051 - 0
3 Spin_Up_Time POS--K 161 161 021 - 6916
4 Start_Stop_Count -O--CK 083 083 000 - 17934
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 001 001 000 - 78560
10 Spin_Retry_Count -O--CK 100 100 000 - 0
11 Calibration_Retry_Count -O--CK 100 100 000 - 0
12 Power_Cycle_Count -O--CK 099 099 000 - 1129
192 Power-Off_Retract_Count -O--CK 200 200 000 - 137
193 Load_Cycle_Count -O--CK 176 176 000 - 72060
194 Temperature_Celsius -O---K 123 106 000 - 27
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
||||||_ K auto-keep
|||||__ C event count
||||___ R error rate
|||____ S speed/performance
||_____ O updated online
|______ P prefailure warning
General Purpose Log Directory Version 1
SMART Log Directory Version 1 [multi-sector log support]
Address Access R/W Size Description
0x00 GPL,SL R/O 1 Log Directory
0x01 SL R/O 1 Summary SMART error log
0x02 SL R/O 5 Comprehensive SMART error log
0x03 GPL R/O 6 Ext. Comprehensive SMART error log
0x06 SL R/O 1 SMART self-test log
0x07 GPL R/O 1 Extended self-test log
0x09 SL R/W 1 Selective self-test log
0x10 GPL R/O 1 NCQ Command Error log
0x11 GPL R/O 1 SATA Phy Event Counters log
0x21 GPL R/O 1 Write stream error log
0x22 GPL R/O 1 Read stream error log
0x80-0x9f GPL,SL R/W 16 Host vendor specific log
0xa0-0xa7 GPL,SL VS 16 Device vendor specific log
0xa8-0xb7 GPL,SL VS 1 Device vendor specific log
0xbd GPL,SL VS 1 Device vendor specific log
0xc0 GPL,SL VS 1 Device vendor specific log
0xc1 GPL VS 93 Device vendor specific log
0xe0 GPL,SL R/W 1 SCT Command/Status
0xe1 GPL,SL R/W 1 SCT Data Transfer
SMART Extended Comprehensive Error Log Version: 1 (6 sectors)
No Errors Logged
SMART Extended Self-test Log Version: 1 (1 sectors)
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Short offline Completed without error 00% 11232 -
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.
SCT Status Version: 3
SCT Version (vendor specific): 258 (0x0102)
Device State: Active (0)
Current Temperature: 27 Celsius
Power Cycle Min/Max Temperature: 20/27 Celsius
Lifetime Min/Max Temperature: 2/44 Celsius
Under/Over Temperature Limit Count: 0/0
Vendor specific:
01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
SCT Temperature History Version: 2
Temperature Sampling Period: 1 minute
Temperature Logging Interval: 1 minute
Min/Max recommended Temperature: 0/60 Celsius
Min/Max Temperature Limit: -41/85 Celsius
Temperature History Size (Index): 478 (223)
Index Estimated Time Temperature Celsius
224 2023-11-02 04:37 32 *************
... ..( 96 skipped). .. *************
321 2023-11-02 06:14 32 *************
322 2023-11-02 06:15 33 **************
... ..( 34 skipped). .. **************
357 2023-11-02 06:50 33 **************
358 2023-11-02 06:51 32 *************
... ..( 17 skipped). .. *************
376 2023-11-02 07:09 32 *************
377 2023-11-02 07:10 33 **************
... ..( 5 skipped). .. **************
383 2023-11-02 07:16 33 **************
384 2023-11-02 07:17 32 *************
385 2023-11-02 07:18 33 **************
... ..( 7 skipped). .. **************
393 2023-11-02 07:26 33 **************
394 2023-11-02 07:27 ? -
395 2023-11-02 07:28 19 -
396 2023-11-02 07:29 20 *
397 2023-11-02 07:30 21 **
... ..( 2 skipped). .. **
400 2023-11-02 07:33 21 **
401 2023-11-02 07:34 22 ***
402 2023-11-02 07:35 22 ***
403 2023-11-02 07:36 23 ****
... ..( 3 skipped). .. ****
407 2023-11-02 07:40 23 ****
408 2023-11-02 07:41 24 *****
... ..( 6 skipped). .. *****
415 2023-11-02 07:48 24 *****
416 2023-11-02 07:49 25 ******
... ..( 2 skipped). .. ******
419 2023-11-02 07:52 25 ******
420 2023-11-02 07:53 26 *******
421 2023-11-02 07:54 26 *******
422 2023-11-02 07:55 27 ********
... ..( 12 skipped). .. ********
435 2023-11-02 08:08 27 ********
436 2023-11-02 08:09 ? -
437 2023-11-02 08:10 20 *
438 2023-11-02 08:11 21 **
... ..( 2 skipped). .. **
441 2023-11-02 08:14 21 **
442 2023-11-02 08:15 22 ***
443 2023-11-02 08:16 22 ***
444 2023-11-02 08:17 23 ****
... ..( 2 skipped). .. ****
447 2023-11-02 08:20 23 ****
448 2023-11-02 08:21 24 *****
... ..( 7 skipped). .. *****
456 2023-11-02 08:29 24 *****
457 2023-11-02 08:30 25 ******
... ..( 3 skipped). .. ******
461 2023-11-02 08:34 25 ******
462 2023-11-02 08:35 26 *******
... ..( 4 skipped). .. *******
467 2023-11-02 08:40 26 *******
468 2023-11-02 08:41 27 ********
... ..( 8 skipped). .. ********
477 2023-11-02 08:50 27 ********
0 2023-11-02 08:51 31 ************
... ..( 39 skipped). .. ************
40 2023-11-02 09:31 31 ************
41 2023-11-02 09:32 32 *************
... ..(181 skipped). .. *************
223 2023-11-02 12:34 32 *************
SCT Error Recovery Control:
Read: 70 (7,0 seconds)
Write: 70 (7,0 seconds)
Device Statistics (GP/SMART Log 0x04) not supported
Pending Defects log (GP Log 0x0c) not supported
SATA Phy Event Counters (GP Log 0x11)
ID Size Value Description
0x0001 2 0 Command failed due to ICRC error
0x0002 2 0 R_ERR response for data FIS
0x0003 2 0 R_ERR response for device-to-host data FIS
0x0004 2 0 R_ERR response for host-to-device data FIS
0x0005 2 0 R_ERR response for non-data FIS
0x0006 2 0 R_ERR response for device-to-host non-data FIS
0x0007 2 0 R_ERR response for host-to-device non-data FIS
0x0008 2 0 Device-to-host non-data FIS retries
0x0009 2 2 Transition from drive PhyRdy to drive PhyNRdy
0x000a 2 3 Device-to-host register FISes sent due to a COMRESET
0x000b 2 0 CRC errors within host-to-device FIS
0x000f 2 0 R_ERR response for host-to-device data FIS, CRC
0x0012 2 0 R_ERR response for host-to-device non-data FIS, CRC
0x8000 4 2430 Vendor specific
But this could just as well be in Marsian, I do not understand what it is telling me. 