How to Troubleshoot Error Code “Couldn’t Unmount Disk” on Mac PC?

Whenever your device is not permitted to revamp specific accesses or directories in the Disk Utility, such as you are attempting to repair your hard drive. If your device cannot remove or partition of your hard drive, that time users are encountering an error message which says; “Disc erase failed couldn’t unmount disc.”, or “Disk Erase failed with the error: Couldn’t unmount disk.”
However, Due to this error “Couldn’t Unmount Disk” users cannot complete essential tasks. There are multiple reasons behind the occurrence of this error. Generally, one of the most important causes behind this error is that specific boot drive which is corrupted or modified.  Moreover, the warning message might blink on your screen while the driver is being used by some other apps or processes. At times, the error occurs due to some problem in the internal drive.
Some common causes of this error code “Couldn’t Unmount Disk.”
  • Failure to separate the Mac HFS.
  • Unable to start or launch any programs or files.
  • Stored corrupted or lost data on the hard drive.
  • Unexpected removal of any running app.
Nonetheless, the error “couldn’t unmount Disk” might be encountered by malware infection or cyber threats. Once perform a full system scan to detect viruses on your system. If in case, the error is not related to virus infection, follow the steps mentioned below.
Steps to Troubleshoot Error Code “Couldn’t Unmount Disk” on Mac PC
Before starting the process, let’s discussed the two methods which are given below to fix the issue. In both methods, one of them will surely work, but for this, you have to follow the steps in the exact sequence to avoid trouble and errors. Here how to do it:
Solution-1: Verify USB Boot Drive
  1. Ensure that your device is connected with the USB boot drive.
  2. Launch the Start Menu to restart your device. While the time you restarting your system seize the “Option Key.” now, a menu list will appear on the screen pick he attached boot drive option.
  3. Permit the “Disk Utility” from the list of Boot menu on your screen.
  4. Lastly, navigate to the First aid and check the disk and revamp it. If needed.
When completed, check for the error, if still, the error persists, try next option.
Solution-2: Using the Recovery Partition Option.
  1. Restart your computer system by navigating to the Start menu. While the time rebooting the system hold the Option key.
  2. Now, select “Recovery Partition” option.
  3. After that, select “Disk Utility” option.
  • Navigate to First Aid, when you need to check and revamp the disk.
To Format, the disk, navigate to Erase option.


Ava Williams is a Microsoft Office expert and has been working in the technical industry since 2002. As a technical expert, Harry Williams has written technical blogs, manuals, white papers, and reviews for many websites such as office.com/setup.

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