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Force unmount disk mac terminal12/20/2023 ![]() Replace "format" with the desired file system format (e.g. Type "diskutil eraseDisk format name /dev/identifier" and press Enter. ![]() Identify the drive that you want to format and make a note of its identifier (e.g. This will display a list of all connected drives and their corresponding identifiers. Open the Terminal app, which can be found in the Utilities folder within the Applications folder. To format a drive using the Terminal app, follow these steps: ![]() While the Disk Utility app provides a user-friendly interface for formatting drives, the Terminal app allows for more customization and control over the formatting process. Given the time I've spent trying to fix this it is ultimately faster to just flatten and re-install.Formatting drives using the Terminal app in MacOS can be a more advanced option for users who are comfortable using command-line interfaces. I had intended on further testing/troubleshooting how to get this to work without blowing away my install but my TimeMachine backup (took 12+ hours to restore) somehow prompted me for the wrong Apple ID (I had changed mine about a year ago) and wouldn't let me progress with the restore past that. I tried disabling time machine, running disk recovery, re-installing Sierra through recovery mode (failed / file unavailable), re-installing High Sierra via recovery mode (installer failed), installing Sierra via a USB drive (hold down option, select USB drive with image on it), and probably something else I'm forgetting to mention. Open Diskutil and reformat the drive to APFS ****Note that you will lose any data stored on the drive**** Open Terminal and force unmount the driveģ. Boot into internet recovery mode Option-Command-RĢ. Sep 27 15:32:48 Hostname OSInstaller: Clearing automation and attempting to rebless. Sep 27 15:32:48 Hostname OSInstaller: Disk repair retry failed too many times. Sep 27 15:32:48 Hostname OSInstaller: Restoring the original state found as mounted. Sep 27 15:32:48 Hostname OSInstaller: Volume could not be unmounted. Sep 27 15:32:48 Hostname diskmanagementd: diskmanagement: : mount failed: err=-69888 un0mt1=0 timeout=0 dissenter=1 dissenterpid=0 dissenterstatus=49168=0xc010 ![]() Sep 27 15:32:48 Hostname OSInstaller: Repairing file system. Sep 27 15:32:48 Hostname OSInstaller: Storage system check exit code is 0. Sep 27 15:32:48 Hostname diskmanagementd: diskmanagement: rawLaunch_block_invoke: waitpid(2) pid=586 ret/errno=586/35 status=0x00000000 exit=0 I had no issues upgrading on my older iMac, 15-inch Macbook pro with touchbar, or VMs. I've also re-downloaded the installer several times. I've tried disk utility repairs both in Sierra, while in the High Sierra installer, and by booting into recovery mode. I have the exact same issue with a late 2016 27-inch iMac with 1TB SSD. ![]()
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