Fix error

By Connie | Posted to Home > Mac Data Recovery Tips, updated on October 19th, 2021 |

Summary: When mounting the disk using Disk Utility, you come across an message saying " disenter error". Use iBoysoft Data Recovery for Mac to retrieve files from the unmountable hard drive. disenter error

In general, you go to Disk Utility to check your hard drive that's not showing up in Finder. However, when you click the Mount feature in Disk Utility, an error message pops up, which reads like "Could not mount disk2s2 ( error 0)" or similar as below:

  1. error 49153
  2. error 49223
  3. error 49244
  4. error 49218
  5. error 49180

Fix error

So, what does the error mean?

Usually, this error shows up with different codes. And it even happens on macOS Big Sur and Monterey. But it all indicates that some problems on the drive or macOS make the disk even cannot be mounted by the Mount feature in Disk Utility.

Consequently, you can't access the photos, videos, documents, or other files on the hard drive.

Well, you can try to find out and fix the possible issues to make your disk mountable and accessible again.

Priority measures for fixing error

Sometimes, the 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 compatible with macOS. If the macOS can't read the drive, therefore it can't be mounted. At present, APFS, HFS+, exFAT, and FAT32 are read-write support while NTFS read-only suport by Mac OS. But for a Linux hard drive, it can't be read on Mac.

However, some users also find that when they insert an NTFS or exFAT drive into a Mac, this error also appears. That’s because they format the drive on Windows but for cross-platform use. Not all Windows allocation unit sizes (block sizes) are supported by macOS. You can try to update your macOS to fix this issue.

Fix the error

After trying the priority measures, the hard drive still cannot be mounted. It shows that the 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 the USB port not working, 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.
Run First Aid feature to fix unmountable drives

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.
  • diskutil list
  • 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 (the Mac Task Manager) 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.
  • Force quit a process in Activity Monitor

Reformat the hard drive

If the mentioned ways still can't work on fixing the 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 Mac Data Recovery. It can help you recover data from an unmountable, corrupted, or inaccessible hard drive.

After recovering data, you can format the external hard drive on Mac.

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 ( 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 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 error. This article offers complete solutions to help you fix the issue and mount your hard drives. Moreover, it also tells you why error appears and how to avoid the error in the future.

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