They are unable to erase or partition the drive. I erased the SSD drive in my MacBook.The user often experiences a problem, while handling some of the Macs, when they are not allowed to repair permissions or directory in Disk Utility. Disk-formathard drivemacospartition. MacOS How to partition an SSD that fails with error 69888 couldnt unmount disk.
![]() Format Wd Passport Couldn'T Unmount Disk Free From CrypticFormatting the hard drive or partition scheme will recreate a new HFS file structure on the hard drive, which will be free from cryptic errors. Fixing with Stellar Partition Manager SoftwareIf the OS X is denying you to format, erase and repair the Mac hard drive or a volume due to the Couldn’t Unmount Disk’ Error then use Stellar Partition Manager to format the hard drive with Mac OS X Extended Journaled file system. The one and only requirement are that Disk Utility must reside on the drive.There are three means of resolution of the problem. The version of the OS X does not matter, by at least must be 10.7, 10.8 and 10.9. Disk Utility can be run from the external drive.But, the important point to remember is that the installer or the recovery drive must reside in the drive, separate from the primary boot disk with the installed OS on it. Any OS X boot drive is needed to complete the task. Fixing with USB Boot DriveThis is the most recommended method to repair the error.![]() The errors could have been unresolvable without a boot drive. The original task which was halted due to the above error was performed againThe above steps offer a resolution of the problem. Verification of the Disk is done with the “First Aid.” It is the Utilities Menu for the Installer Disk Disk Utility is accessed through the Boot menu. The OPTION key is held during the booting and then the attached boot drive is selected Change user name for word for macIn this case, a resolution of the problem occurs with the Recovery Partition, which comes with all the newer versions of the Mac OS X. Fixing With Recovery PartitionThe above error may also be triggered due to first Aid or while formatting a non-boot partition. For the older Mac OS X like 10.6 or earlier, the opportunity lies in a SuperDrive and a bootable DVD, and this can also offer the same resolution. The Disk Utility is chosen from the Boot Menu The Mac is rebooted, with the OPTION key being held down and the Recovery Partition is chosen Otherwise, we follow the steps: Then the resolution lies in the previous method. ![]()
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