Step 3: Choose Disk Utility in appeared boot menu Step 2: Now, choose Recovery Partition option from the appeared menu

Step 1: At first, restart your Mac and press & hold option key Step 6: Follow the steps if you want to unmount further the disk on your Mac Procedure 2: You can use Recovery Partition Step 5: After that, replace /dev/diskx with the correct disk number Step 4: Now, type sudo diskutil unmountDisk force /dev/diskx command in command line Step 3: Once list of all disks appears, you need to found the disk that you want to unmount Step 1: At first, access Terminal application You may also read: How to Fix Error 0xc000009a B1 Initialize Library Failed Issue On Windows PCs Ways to Fix Couldn’t Unmount Disk Mac: Tips & Tricks Procedure 1: fix couldn’t Unmount Disk error by using command line Let’s take have a look at solution to fix this issue. In case you have this issue on your PC, you might face several issues including sudden elimination of the running application, lost or corrupted files on hard drive, unable to open particular files or programs and unable to partition Mac HFS as well. The alert message might popup on your Mac when the driver is being used by other apps or process.Īs we know that, Disk Utility is important feature that helps to solve any problems related to disk or storage on your System.It might possible to get this error if boot drive of your System has modified or corrupted.When the device is not allowed to repair specific permissions or directories in Disk utility, then might popup this error message on your Mac screen.When a device cannot erase or partition the drive, users are delivered Couldn’t Unmount Disk error or related messages.Reasons behind Couldn’t Unmount Disk Error on Mac Procedure 3: To fix couldn’t Unmount Disk error Mac, you can check USB Boot Drive.Procedure 2: You can use Recovery Partition.Procedure 1: fix couldn’t Unmount Disk error by using command line.Ways to Fix Couldn’t Unmount Disk Mac: Tips & Tricks.Reasons behind Couldn’t Unmount Disk Error on Mac.

Mac could not unmount disk