An external disk refuses to mount, com.apple.DiskManagement.disenter error -119930868.

Force quitting fsck_ext from the Activity monitor fixed the problem. Thanks for the tip mdfilmstudio.

I’ve since allowed the disk check to run its course (took about 30 mins for 1TB disk) now works without issues.

I remove my external drive (ExFAT) without properly ejecting it and faced similar issue. Could not mount it in OSX. I had to scan and fix it from a windows machine then it got fixed.

If your drive has an activity indicator, you could probably notice that it's busy while connected, but not able to mount.

This means that an fsck command is run on it, checking for errors. This is not a specific Catalina issue. Just be patient or kill fsck, say, from 'top' console command

Hi friend. I had your problem and since I saw your comment I searched for like 3 or 4 days and finally I found the solution:

Go to www.Tuxera.com and download it for mac.

After installation , your mac will restart. after that you're good to go.

Just plug your Hard Drive in and use it.

Simple as that

It worked for me. Hope it works for you too.

OK, first off I'm quite a junior when it comes to Mac's. However I got this issue resolved. I did the the convert to APFS system as it seemed to be the "smart" thing to do. However the drive showed out grey. I couldn't mount or erase or restore, just nothing. I believed that in the conversion the drive would be partitioned. It was not. After a call to Apple Care they determined they didn't know what the problem was either. After the call I tried the partition option. Problem fixed in 10 seconds. I don't know if that's the issue but it worked for me. Good luck!

Ok so its been a week since i pressed the "i have this problem too button"

i spent most of my days not being able to write on the disk only read it and last night i tried to repair the disk again in disk utility. it didnt seem to do anything but this morning i noticed it finished the process and i pressed mount and it worked.

Sharing & permissions changed to " you have custom access". what i want to say is ease us and tuxera didnt do anything or the western digital discovery. The only thing that worked was my patience.

Hi. I did what SAL0808 suggested and after installing Windows NTFS Tuxera and once the system was restarted, the external disk returned to life and performed a time machine data backup with no problem.

Hola. A mí me sucedía lo mismo y lo que hice, siguiendo los consejos de un compañero de este fórum fue instalar la app TUXERA.

Tras dicha instalación, y después de reiniciar el equipo, el disco externo montó sin problemas.

Alsoft DiskWarrior. Expensive, but it worked for me. Used the mount button. Then rebuilt the drive's directory with no data loss. I can't guarantee anyone else's results. I don't work for Alsoft. Just saying, it worked for me.

I think i have stumbled upon a solution. It's not ideal, but this is what i found to work consistantly.

1. > Logout
2. Log back in

thats. it!

If that doesn't work, try to shutdown and then start again. But for me just logging out and logging back in seems to have done the trick.

It's super annoying to do every-time i need to connect a device. but for now it seems to have worked.

There may be some process running in the background that hinders the MacBook to mount the disk, for me it was NTFS for Mac application so go through the Activity Monitor and quit unnecessary applications.

I almost cried when this just happen to me on Sandisk 1TB SSD (only a week old).

Fortunately I have manage to Mount the disk again without losing any data.

Open Activity Monitor > highlight Disk and search for fsck > Double click fsck > click Quit > choose Force Quit, the external drive immediately appeared on the desktop with full access to all files 😮‍💨

I eject the disk correctly each time yet have found I need to complete this action to access the disk each time I connect it.

So I tried everything, absolutely EVERYTHING and currently I have Catalina, tried to update to Big Sur but since I have a MacBook Air I don't have a lot of space for that. What worked for me was going to Launch Pad - Open Activity Monitor - and then Force Quit fsck_ext. After that my external hard drive magically appeared on my screen again! I was this close "." to buy a new hard drive.

I've had this issue with 2 separate hard drives and I got both to work!! It really is Catalina or what ever OS software you're using most likely. I always find a solution and forget to post it. Ultimately it comes down to just leaving your ex-drive plugged in for extended period of time and it should show follow steps below!

Step 1. Open Finder

Step 2. Go To Applications

Step 3. Go to Utilities

Step 4. Go to Disk Utility

Step 5. Your drive should appeared greyed out on the left hand side under "External"

Step 6. Click on the drive you'd like to mount

Step 7. Click on Mount (should be next to restore at the top under "Disk Utility"

Step 8. You should get an error message click ok

Step 9. Click on mount again you'll continue you to get the error message so rinse and repeat

Step 10. After 3 or however many attempts you've made to mount your hard drive just leave it plugged in

Step 11. Leave drive plugged into Mac and it should mount within 30 minutes or so after your failed mount attempts