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

I could not mount my hard disk due to this error :com.apple.DiskManagement.disenter error -119930878

Solution :

1) GO to activity monitor

2) Go to disk tab

3) Quit diskunmountwatch process

Try mounting your disk again, it worked for me!!

I had the same problem. It was caused by the drive being removed without being ejected correctly. I tried a few of the solutions but the thing that worked was actually just waiting like 20 minutes and it eventually sorted itself out. Someone else said it on here but the more data you have on your drive the longer it takes to figure itself out. So I would try giving it a few hours before going into the terminal or buying expensive apps.

I had the same issue and I had to shutdown the machine, power on again and the issue was fixed.

This worked for me, however it was called fsck_*** . I ended the task and the drive mounted fine.

Thank you....

Make sure you go to the "disk" tab in the Activity monitor to look for the process.

Had the same issue yesterday, ended up downloading DiskWarrior to rebuild the directory file (It took like an hour for it to be rebuilt and had no data loss)

This worked perfectly.

1. Press ⌘ + Spacebar and search for `Activity Monitor`
2. Select the CPU tab on top
3. Select `fsck_ext`
4. Press the `x` button in the top left
5. Done

DiskWarrior. It's really, really expensive, but it mounted my

unreadable hardrives and rebuilt the directories so disks mount. No

data loss! No guarantees, but it worked for me.

I tried DiskWarrior. It's really, really expensive, but it mounted my

unreadable hardrives and rebuilt the directories so disks mount. No

data loss! No guarantees, but it worked for me.

I tried DiskWarrior. It's really, really expensive, but it mounted my

unreadable hardrives and rebuilt the directories so the disks mount. No

data loss! No guarantees, but it worked for me.

I tried DiskWarrior. It's really, really expensive, but it mounted my

greyed out hardrives and rebuilt the directories so the disks mount. No

data loss! No guarantees, but it worked for me.

force exit fsck_ext from Activity Monitor under CPU tab worked for me!

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

My Lacie 2TB portable hard drive suddenly couldn't be mounted on my Macbook Pro (Running Catalina) after it shut down because of low battery power. When I restarted... nothing. I tried to mount it on my MacPro, (High Sierra), same thing and I freaked.

After reading here that all I had to do to restore it, is wait, I didn't think it could be that easy... but it was. It took about an hour, leaving the drive connected before the computer could mount the drive. All is good.

I had another disc give that error (dissenter error) and this time the fsck_ext didn't show up in Activity Monitor. It wouldn't mount on the iMac - so I plugged it into a PC and formatted it ExFat from there no problem, and it now works on the Mac.

Interestingly I ran into the same issue with my new MacBook usb-c and Catalina. After I accidentally unplugged the external drive (sometimes it just removes itself, probably due to power issues) I can't mount the drive anymore. Its a portable 4TB WD drive USB3 with extfat. If I mount it on Linux on another computer it works again. It's a nasty workaround but it works for me.