In general, you go to Disk Utility to have a check when your hard drive hasn't shown up in Finder. However, when you click the Mount feature in Disk Utility, an error message pops up, which reads like "Could not mount disk3s2 (com.apple.DiskManagement.disenter error-119930868)" or similar.
So, what does the com.apple.DiskManagement.disenter error mean? This error message usually appears with different error codes like 119930878 and 49153. But in a word, they all indicate that the disk even cannot be mounted by the Mount feature in Disk Utility. Consequently, you can't access the files, photos, videos, documents, or other important data on the hard drive.
Making the hard drive mountable will help you fix this error and read and write to the target drive. As the hard drive even cannot be mounted via the Mount feature, there may have some problems on the drive or on macOS. You can try to find out and fix the possible issues to make your disk mountable and accessible again.
- 1. Check the connections
- 2. Run First Aid feature in Disk Utility
- 3. Using Terminal to mount the disk
- 4. Force quit fsck_ext from the Activity Monitor
- 5. Reformat the hard drive
Priority measures for fixing com.apple.DiskManagement.disenter error
Sometimes, some mount process will take a longer time than usual for unknown reasons. You can wait for a moment to let it mount. If the waiting makes no changes, you can try to restart your Mac. Because sometimes, the unsuccessful mounting is caused by a temporary bug on macOS.
Besides, make sure the file system of the drive is read support on Mac. If the macOS can't read the drive, therefore it can’t be mounted. At present, a hard drive formatted with a file system like APFS, HFS+, exFAT, FAT32, or even NTFS is read support on Mac. But for a Linux hard drive, it can't be read on Mac.
Fix the com.apple.DiskManagement.disenter error
After trying the priority measures, the hard drive still cannot be mounted. It shows that the com.apple.DiskManagement.disenter error is caused by more complex issues. Go to try the ways listed below. Maybe they are the real problem solvers.
For external hard drives:
Check the connections
External hard drive mounting is an automatic communication process between the OS and the file system of the drive via the USB port. If there’s a bug in the plugging process, something wrong with the cable, or USB port, the external hard drive will fail to be connected or mounted.
You can try to eject and unplug the external hard drive and then replug it to another USB port on the Mac. Or replug the hard drive with a new matchable cable. If it still doesn’t mount automatically, mount it through the Mount feature in Disk Utility.
Run First Aid feature in Disk Utility
First Aid is a disk checking tool on Mac. It can detect and repair errors related to the formatting and directory structure of a disk. If there's a file system error caused by incorrect ejecting at last time, a sudden power off, formatting, or other reasons, First Aid may solve it, and then the drive may be mounted.
- Open Disk Utility and select the unmounted drive on the left sidebar.
- Select First Aid and click Run.
Note: First Aid won't erase or corrupt the data on your drive.
After running First Aid, if the hard drive still cannot be mounted automatically, try to mount it via the Mount feature again.
Using Terminal to mount the disk
As a command-line interface on Mac, Terminal allows you to control your operating system and make some changes. When there's a logical error in the process of mounting, the hard drive refuses to be mounted. But the Terminal can work as a bridge to let you take control of the core of the system and then mount the hard drive via command lines.
- Open Finder > Applications > Utilities > Terminal.
- Type the following command to show all the drives on Mac. Then, find the identifier of the unmountable drive.
- Type the following diskutil command to mount the drive. Here the disk1s2 should be replaced with the identifier of your unmountable drive.
diskutil mount /dev/disk1s2
Force quit fsck_ext from the Activity Monitor
If you have used fsck to check the unmountable hard drive, this error may happen when the fsck stuck on the checking process. Using Activity Monitor can quit a process, even if it's in a loop or not responding. Thus, you can try to force quit the fsck in Activity Monitor.
- Open Activity Monitor > search fsck in all tabs (CPU, Memory, Disk, etc.).
- When finding the fsck, select it and click the × icon on the upper-left corner.
- Select Force Quit.
Reformat the hard drive
If the mentioned ways still can't work on fixing the com.apple.DiskManagement.disenter error, it shows that the file system of the drive is probably severely corrupted. You have no choice but to reformat it.
Reformatting a drive will cause data loss. So, to prevent your data from permanent loss, firstly, you should recover data on the hard drive. Here recommend the useful data recovery software to you - iBoysoft Data Recovery Software for Mac. It can help you recover data from an unmountable, corrupted, or inaccessible hard drive.
After recovering data, you can reformat the unmounted external hard drive.
For the internal drives
Some of the above ways like running First Aid and using Terminal are also suitable for fixing the "Could not mount Macintosh HD (com.apple.DiskManagement.disenter error 0)". But as the internal drive contains startup volume (Which has files of the operating system), you can refer to the 7 solutions for fixing Macintosh HD not mounted.
Tips to avoid com.apple.DiskManagement.disenter error
From the mentioned ways above, you can find that the issues that result in this error are complex. And some of the problems are probably due to your wrong operations in daily life. Keep away the listed wrong operations will reduce the risk of encountering this error.
- Don't directly unplug your external hard drive (You should right-click the hard drive and select Eject before unplugging it).
- Don't download untrusted third-party software.
- Don't forget to check your Mac and external hard drives with First Aid in routine.
- Don't power off your Mac suddenly before shutting it down properly.
Don't feel panic when encountering the com.apple.DiskManagement.disenter error. This article offers complete solutions to help you fix the issue and mount your hard drives. Moreover, it also tells you why com.apple.DiskManagement.disenter error appears and how to avoid the error in the future.