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What causes this particular error and what can I do to mount this drive or retrieve the data from it?
iMac Line (2012 and Later)
I ran into this issue with a Western Digital 2TB drive... I had seen some irreperable disk errors and was ironically, attempting to back the drive up so I could reformat it... so, I was panicking because I've got some important data on the drive and was starting to research data recovery tools. After messing around and doing some research, I discovered the system was trying to run a filesystem check on it and was getting hung up.
I opened a terminal window and entered the following commands
$ ps -ef | grep fsck
$ sudo kill [pid from above]
BAM! Disk mounted just like that.
At this point, I opened Disk Utility and ran First Aid... which ironically unmounted the drive and then got hung up again... DUH! So had to repeat the process. At this point, with the drive mounted, I backed up the drive and reformatted it.
Hope this helps.
Just want to add my voice to the cacophony of frustration. C'mon Apple, this is a big deal!
Thanks for chiming in saddlemeyer! This should be a top priority for them!
Peaeye ABSOLUTELY!!! Thank you. Let's get a response Apple.
This actually worked!! Whew! I thought I lost all my files.
Thanks, this worked for me!
Worked for me, but it wasn't called fsck_ext, it was fsck_something else. Quit the process and the drive mounted.
force exit fsck_ext from Activity Monitor under CPU tab worked for me!
I have the same issue with an external SSD but when I open Activity Monitor there is no fsck_* process running.
This is exactly what I did - I let it sit for a while and eventually it mounted and is fine.
My problem was solved when I did the -First Aid- from the Disk Utility.
How do I mount HD to retrieve Data. Have macOS Catalina Version 10.15.7
HD shows in Disk Utility. Greyed out under HD name
I've got the same problem with an external drive. Unplugged it in error and now it won't mount.
correction: it was sophos!! If you use sophos antivirus, that might be the problem!
for Big Sur search for fsck_exfat
This only works if you don't need the data from the drive.
An external disk refuses to mount, com.apple.DiskManagement.disenter error -119930868.
