How to fix “Couldn’t unmount disk Error on Mac”įollowing are some of the solutions that can help to fix the error message “Couldn’t unmount disk on Mac”. Solution 1: Fix the error “Can’t unmount disk mac” using the USB Boot drive #FIRST AID MAC VOLUME COULD NOT BE UNMOUNTED HOW TO# It is the most common solution to fix the error with the support of Boot drive. If the Boot drive was not there, then the error would have remained unresolved. Step1: Be sure that the USB Drive is connected to your Mac device and then start to reboot the system. Step2: Now, when the boot process holds the “Option” key, select the option “attached boot drive” from the utility menu. Step3: After this step, from the Boot menu access Disk Utility. (If you are using Installer disk, then go to the “Utilities” menu and click on “Disk Utility” option). Step4: Go to option “First Aid”, verify the disk and start repairing the drive if required.Īs you can see a boot drive is essential in this case. These steps should eliminate the issue, but if this method fails to do so then opt for the following method.
Solution 2: Fix using a Recovery Partition This method can be beneficial when the disk error occurs while formatting a non-booted partitioning or by First Aid. Step1: Reboot your device (Mac) and hold the “Option” key while booting. Step2: Then, choose “Recovery Partition” option from the Boot menu. Step3: From the Boot menu select “Disk Utility” and go to “First Aid” to verify and repair the disk or go to “Erase” if you wish to format the disk. This method will not work if the disk which is throwing this error and the primary boot partition is the same. The error message “Can’t unmount disk” can also be eradicated from Mac using the command line. Step1: Access the “Terminal Application”. Step2: Then, type “diskutil list” to get the list of all the disks on Mac.
Step3: Now, search for the disk you want to force unmount. Step4: After finding the disk, type “sudo diskutil unmountDisk force/dev/diskx” line and replace “/dev/diskx” with “/dev/disk1” which is an acceptable disk number.įollowing the above-listed steps carefully! If you still find that the drive is failed to get mount on Mac and requires recovery then, use “Bitwar Data Recovery Software for Mac” to recover all your data.Īs professional data recovery software, Bitwar helps you recover deleted files after emptying the Trash, formatted data, hidden data on external hard drive, data lost due to can’t unmount disk error or unreadable disk. #FIRST AID MAC VOLUME COULD NOT BE UNMOUNTED SOFTWARE# #FIRST AID MAC VOLUME COULD NOT BE UNMOUNTED SOFTWARE#.#FIRST AID MAC VOLUME COULD NOT BE UNMOUNTED HOW TO#.
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