The Macintosh HD is unable to be mounted in Disk Utility normally, you can try to fix it with Disk Utility’s First Aid in Recovery Mode. Secondly, Repair the unmounted Macintosh HD in recovery mode. First, restart your mac Sometimes when you turn it back on, everything returns to normal.
![]() Format Wd Passport Couldn'T Unmount Disk Mac Sometimes WhenEnter your admin password if prompted. (Remember to use the ‘diskutil list’ command if you need to find out your disk identifiers): sudo diskutil unmount force /dev/diskx2) Press RETURN. (For example to Erase/Partition the disk).1) Using the Terminal application again, booting from OS X Recovery or an external bootable drive.Enter the following where ‘x’ is your disk identifier. This should force unmount the volume:3) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. Enter your admin password if prompted. Keygen app for macAmsys will not compensate you in any way whatsoever if you ever happen to suffer a loss/inconvenience/damage because of/while making use of information in this blog.This feature has been tested using OS X v10.9.2 which was the latest Mac OS release at the time of writing. This should force erase the entire physical disk and all its related volumes, then create a single Mac OS Extended (Journaled) volume:3) Hopefully you can now perform your desired erase, partition, installation or deployment on this drive.NOTE: Use of the ‘sudo’ command may not be necessary for some of these actions, however, as long as you know the administrator account’s password, starting any unix command with ‘sudo’ will force the command to be run as the unix root user, so you shouldn’t have any permission issues executing the command.While the author has taken care to provide our readers with accurate information, please use your discretion before acting upon information based on the blog post. Enter your admin password if prompted. This should then allow you to partition and work with the physical disk again.Enter the following where ‘MacintoshHD’ is the name of the newly created Mac formatted partition, and where ‘x’ is your disk identifier, (remember to use the ‘diskutil list’ command if you need to find out your disk identifiers): sudo diskutil eraseDisk JHFS+ MacintoshHD diskx2) Press RETURN.
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