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.
You're great SAL0808!!!
I did what you suggested about downloading and installing Windows NTFS Tuxera and after the installation, the system was restarted and the external disk came to life !!!
Millions of thanks my dear, I really love you.
mac1317's help worked when I had a disc that wouldn't mount..... now just helped my Time Machine disc that I was error checking with Disk Utility. I did this before and it took over an hour but sorted itself out and I eventually could press "done".
Not today, started, went out, came back 4 hours later and it was still "checking catalogue" (or something!)
Opened Activity Monitor and there at the top of the process list was ....... consuming a whopping 3+ Gb of memory!
Killed it, Disk Utility immediately said it had failed to verify or repair disc but at least I could get out of it!! Just checked this disc, all info still there, Time Machine working OK so no harm done.
However, that process needs looking at!
[Edited by Moderator]
Thank you for all your helpful comments. After two hours of wasted time, I found this forum. I tried Tuxera and it did not work for me but killing the fsck_* in activity monitor has seemed to work for now. This is ridiculous and should be addressed by Apple.
for some of you downloading Tuxera (and paying for it), I would look into getting Paragon Software, on the Seagate website. I would assume It works with only Seagate drives, but it fixes the issue for free. I was also able to mount one of my drives that was greyed out in Disk Utility. Hope this helps!
From what i read i literally did what a few suggested which is to leave my external hard drive connected. I left it on over night and miraculously in the morning i now see the external hard drive. Hope this helps!
Tuxera was my only (quick) solution too. My 4TB external ExFat HD 'suddenly' stopped mounting. After reading a couple of possible solutions I did realise it probably happened when the power supply in the street was cut for couple of hours ( I always leave my MacMini in sleep). So Disk Utility did see the disk but couldn't mount it, killing fsck in the Terminal didn't work.
Tuxera (which I happened to have purchased years ago and occasionally use to write to & format NTFS drives) did the job and mounted this very important hard drive (of which I don't have a backup, ouch). Thanks for this tip!
Does the Mac recognize the drive in the System Information window (hold down the Option key and go to the menu and select System Information)?
That was the problem for me too domagoj240. That's why I purchased the Tuxera NTFS app.
Paragon is not up-to-date for OSX
for Big Sur search for fsck_exfat
It does resolve the issue with the right extension e.g. fsck_hfs. Double click on process listed in Activity Monitor and choose quit.
This doesn't really help. I don't want to lose all the info I have on my external drive. You've made it sound like it's the drive issue but it's really with how the new Catalina update is working to read these drives. Please provide a better fix. I need drive access without reformatting & it's worked fine up till the latest update.
I recently purchased a new IMac and upgraded it to Catalina. BIG mistake!! I have this same problem and it will not mount any external hard drives. These drives all still work fine on my old macBook running Mojave 10.14.1. This problem started when I Accidentally unplugged a drive and didn't trash the icon first. Another problem is Disk Utility and some other programs will not respond to a QUIT command. The only way to get them to quit is to force quit them. I assume you will have a fix soon???
I'm having a similar issue - "com.apple.DiskManagement.disenter error 0." since the Catalina upgrade.
I've a partitioned 2Tb drive - half I drag & drop files to, the other half is for Time Machine. I have another disc that I use as a backup for the files/data but not as Time Machine.
My partition for dragging files into mounts but the Time Machine partition won't. It wt was last seen in action trying to backup a few days ago but announced it had insufficient space.
An ideas?
I'll also post on a Time Machine forum
I am running a MacMini with Catalina (current rev) and got the same error. I have an external Drobo Mini which has been working without any issues for years. But with Catalina I got this error. I ran "First Aid" (Disk Utility) without success. After that there was no indication of any disk I/O going on with the DroboMini...but 5 minutes later it spontaneously mounted itself and is good for both read and write. I have no idea what was going on in the background that caused the disk to finally mount, but I do know that I had nothing to do with it...not the result of any action I took. So the MacMini/Catalina combo seems to have a "mind of its own" and does what it will do without telling the user/owner/admin person that anything is going on. Glad it's working though I do not understand the idiosyncrasies of the process that got it working.
An external disk refuses to mount, com.apple.DiskManagement.disenter error -119930868.
