Anyway, I’m happy to see my free iMac is finally working after a whole night’s effort. It must be something related to Mojave itself. Now perform the original task that threw the Couldn’t Unmount error. I just simply went to Disk Utility and click Erase. Hold down the OPTION key during boot, then select the attached boot drive (typically has an orange icon at the boot menu) At the boot menu, choose Disk Utility (if using an Installer disk, pull down the Utilities menu to access Disk Utility) Go to First Aid and verify the disk, then repair if needed. Alright, I decided to try it as a last resort. Then I found this post where OP mentioned their problem has been resolved by using a High Sierra USB installer (I’m using Mojave). It doesn’t look like disk0 has been using, as the system is booting from external drive. I tried to put another command line mount to help identify what disks were actually mounted but I couldn’t find where went wrong. I got the error:įorced unmount of disk0 failed: at least one volume could not be unmountedĪfter running the command line, I tried to unmount each one of the disks in the above list (there’s 23 disks in total) and see if I could unmount disk0 after that. With this method I can at least look deeper into the issue. I used command line to force unmount disk within above two modes. I also went to Internet Recovery Mode by pressing Cmd ⌘ Option ⌥ R. I used an USB bootable installer for Mojave to boot, which is the same system of the current disk. Then go to the Erase Tab and select the new expanded partition then click erase. Then expand the first partition to include the whole drive (bottom right hand corner). I have been searching and trying some possible solutions but none of them gave me good result: In DU on the partition tab highlight the last partition and click the Minus Sign. It was similar to error message that you get when trying to delete a file that is still opened. At the prompt paste these lines individually pressing RETURN at the end of each line. If that doesn't work then quit Disk Utility and open Terminal from the Utilities' menu. I realized it’s likely because I was using the local recovery partition disk. After doing that click on the Unmount button in the toolbar to see if the disk disappears from the Desktop. No matter what option I chose, it just showed an error message: Usually it can be repaired through Apple’s default tool Disk Utility.Ī New issue happened when I tried to erase/repair the disk in Disk Utility during Recovery Mode. Go to Applications > Utilities and launch Terminal, or choose it from the Utilities menu in macOS Utilities in Recovery mode. However the screen stopped at the Apple logo. You still won’t be able to unmount a volume that you have booted from, but you can use it to unmount an external disk or from Recovery mode to unmount your main boot disk. Open your terminalThen enter diskutil list to see if you need to rebuild the Recovery HD. I am confident of my ability to fix electronics and it could be a worthy investment if succeed. The screen looked unscratched, so I told my partner we should grab it. Back up as many of your files as possible, reformat the disk, and restore your backed-up files.It sounds super weird, but I found a 27’ iMac when I went to throw out garbage. If you have any idea to get the HDD working or even safe the files, I would be really grateful.Īlmost forgot about this from Disk Utility:ĭisk Utility can’t repair this disk. This was the try: $ sudo diskutil eraseDisk JHFS+ DISK_VOLUME disk1īut it didn't work as well.
Than for each disk: $sudo diskutil unmount force disk1snīecause I wasn't able to do anything with my external HDD I made a desperate attempt to erase everything on it, including unbackuped files, cause this used to be the backup plan. Gave this: Forced unmount of disk1 failed: at least one volume could not be unmounted If I open it in disk util I sometimes see an actual name of a partition, but most likely it's not the real name.Ģ: Apple_HFS Macintosh HD 140.0 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3Ĥ: Microsoft Basic Data BOOTCAMP 110.1 GB disk0s4Īnd then to unmount this: $sudo diskutil unmountDisk force disk1 My 1TB LaCie Rugged THB decided it was a good idea to stop working all of a sudden.
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