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External Drive Won't Mount after "Disk Not Ejected Properly" Message

What is the best method of repairing what appears to be a catalog file's invalid node structure on an external drive?


Background

  • Drive was purchased new in Q3 2018
  • Light to infrequent use of drive
  • No prior issues


Events Prior to Failure

  1. Woke computer from Sleep mode
  2. Connected USB cable to computer from external drive
  3. Disk mounted
  4. Accidental loss of connection via USB 3.0 to Thunderbolt 2 adaptor
  5. "Disk Not Ejected Properly" message
  6. Fully disconnected USB cable from computer to external drive
  7. Reconnected USB cable to computer from external drive
  8. Disk mounted
  9. Restarted computer
  10. Disk mounted
  11. Disk operational throughout the day
  12. Ejected disk
  13. Fully disconnected USB cable from computer to external drive
  14. Closed computer (Sleep mode)
  15. [Next Day]
  16. Reconnected USB cable to computer from external drive
  17. Woke computer from Sleep mode
  18. Disk failed to mount


External Drive Info

SATA External Physical Drive (LaCie d2 Thunderbolt™ 2, 8 TB) • Mac OS Extended (Journaled)


Mac Hardware Info

  • Model Name: MacBook Pro (15-inch, 2018)
  • Model Identifier: MacBookPro15,1
  • Processor Name: 6-Core Intel Core i9
  • Processor Speed: 2.9 GHz


OS Version Info

macOS Catalina 10.15.4 (19E287)


Disk Utility > Mount 'Error Message':

Could not mount “LaCie”. (com.apple.DiskManagement.disenter error 49244.)


Disk Utility > First Aid Details:

  • Repairing file system.
  • Volume is already unmounted.
  • Performing fsck_hfs -fy -x /dev/rdisk2s2
  • Checking Journaled HFS Plus volume.
  • Checking extents overflow file.
  • Checking catalog file.
  • Invalide node structure.
  • The volume LaCie could not be verified completely.
  • File system check exit code is 8.
  • Restoring the original state found as unmounted.
  • File system verify or repair failed. : (-698450)


Operation failed...


Terminal Commands Info


MacBook-Pro:~ UserName$ diskutil verifydisk disk2
Started partition map verification on disk2
Checking prerequisites
Checking the partition list
Checking the partition map size
Checking for an EFI system partition
Checking the EFI system partition's size
Checking the EFI system partition's file system
Checking the EFI system partition's folder content
Checking all HFS data partition loader spaces
Checking booter partitions
Checking Core Storage Physical Volume partitions
The partition map appears to be OK
Finished partition map verification on disk2

MacBook-Pro:~ UserName$ diskutil mount disk2s2
Volume on disk2s2 failed to mount
If you think the volume is supported but damaged, try the "readOnly" option

MacBook-Pro:~ UserName$ diskutil list
/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI EFI                     314.6 MB   disk0s1
   2:                 Apple_APFS Container disk1         1.0 TB     disk0s2


/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +1.0 TB     disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD - Data     381.5 GB   disk1s1
   2:                APFS Volume Preboot                 81.9 MB    disk1s2
   3:                APFS Volume Recovery                528.1 MB   disk1s3
   4:                APFS Volume VM                      1.1 GB     disk1s4
   5:                APFS Volume Macintosh HD            11.1 GB    disk1s5


/dev/disk2 (external, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *8.0 TB     disk2
   1:                        EFI EFI                     209.7 MB   disk2s1
   2:                  Apple_HFS LaCie                   8.0 TB     disk2s2


MacBook-Pro:~ UserName$ sudo fsck_hfs /dev/disk2s2
** /dev/rdisk2s2
   Executing fsck_hfs (version hfs-522.100.5).
** Checking Journaled HFS Plus volume.
   The volume name is LaCie
** Checking extents overflow file.
** Checking catalog file.
   Invalid node structure
(4, 25180)
** The volume LaCie could not be verified completely.


MacBook Pro 15″, macOS 10.15

Posted on Aug 8, 2021 3:09 PM

Reply

Similar questions

5 replies

Oct 4, 2021 10:33 AM in response to FusionFarm

I agree with you. DiskWarrior is second to none rebuilding the directory of HFS+ disks and bringing them to life when all other utilities (including Apple Disk Utility - Fist Aid) fail and even damage more the disk. The problem is that DiskWarrior does not support APFS disks because Apple has not released the required documentation and API. The same can be said for the other two disk utilities: TechTool Pro and Drive Genius. It is true that APFS is much more robust than HFS+, but it would be great to have DiskWarrior to rebuild its directory, just in case it is needed.

Aug 9, 2021 10:15 AM in response to FusionFarm

Hi FusionFarm,


Thanks for contacting the Apple Support Communities today! We understand you're having issues with your external drive not mounting when connected to your MacBook Pro, and we'd be happy to provide you with some steps that may help.


To get started, we'd recommend working through any steps you may not have already tried in this resource here: If a USB device doesn’t work with Mac - Apple Support


Also if possible, would you have an opportunity to test the external drive with another computer?


If still having issues after the steps above, and since you are getting a 'repair failed' error when running First Aid through Disk Utility, it is possible that the external drive may need to be replaced. Fore more details, check out this additional link here: Repair a storage device in Disk Utility on Mac - Apple Support


We hope this is able to help.


Best regards.

External Drive Won't Mount after "Disk Not Ejected Properly" Message

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