Fix 1: Submit the following commandsOpen the Terminal App in Utilities or Application.
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Cannot upgrade to High Sierra: Unable to unmount volume for repair? Ask Question. Attach the USB thumb drive to your Mac and then make a bootable, High Sierra installation disk out of thumb drive by running the following in Terminal. Force unmount the internal fusion drive and format it. Here is where the scary bit begins. You're going. This article helps to solve the error stating “Can't unmount disk mac”. Error on Mac” mainly occurs when the system is restricted to repair or fix specific. One of these error messages “Disc erase failed couldn't unmount disk.
I have two internal drives in my 27' iMac (10.8.5). An SSD system disk and a 1TB SATA drive.The HDD has been acting up recently, very slow performance, bad behavior etc. Tech Tool Pro and Disk Utility don't seem to be able to fix the drive, so I decided to wipe the data by a reformat and writing zeros to the entire drive.Everytime I try and format, it tells me that the drive cannot be unmounted. I have rebooted a few times, and spent days running everything from TechTool Pro on it and it won't go.
$ diskutil list disk2/dev/disk2#: TYPE NAME SIZE IDENTIFIER0: GUIDpartitionscheme.4.0 TB disk21: EFI EFI 314.6 MB disk2s12: AppleHFS Everest 4.0 TB disk2s2$ diskutil repairVolume /dev/disk2s2Started file system repair on disk2s2 EverestUpdating boot support partitions for the volume as requiredError: -69673: Unable to unmount volume for repair$ diskutil eraseDisk JHFS+ Everest /dev/disk2Started erase on disk2Unmounting diskError: -69888: Couldn't unmount diskAny thoughts on how to get it to unmount and reformatted? Is there a way in Terminal to do this instead? When a disk is first connected, macOS helpfully tries to run fsck on the volume. If the volume is large or has extensive problems, this process can run for a long time before it fails.The following Terminal command should identify the process at fault: sudo lsof grep disknreplacing diskn with the number of the offending disk.Once you have the process ID, you can kill it thus: sudo kill -9 pidreplacing pid with the process ID determined above.Then you can run diskutil normally, either from GUI or command line.
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January 2023
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