Almost forgot about this from Disk Utility: Disk Utility can’t repair this. If you have any idea to get the HDD working or even safe the files, I would be really grateful. But before trying this method, make sure that the recovery drive is located in the drive (a separate copy of os installed on it). This was the try: sudo diskutil eraseDisk JHFS+ DISKVOLUME disk1 Started erase on disk1 Unmounting disk Error: -69888: Couldnt unmount disk. This fix has worked for many users, so there are high chances that this will work for you as well. Fix “Couldn’t Unmount Disk” Error with USB Boot Drive If the issue is still there, then assume that the error is caused by modifying the bootable disk. A new try to erase Macintosh HD and creating Macintosh HD failed with the following alert: Erasing Macintosh HD disk2s5) and creating Macintosh HD Preparing to erase APFS volume content Checking mount state The volume Macintosh HD on disk2s5 count be. Stack Exchange Network Stack Exchange network consists of 183 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build. Once the process is finished, check if the issue has resolved. Press a key or wait a few seconds to continue starting up. I want to erase a disk (Mac system) to resize OS X Mountain Lion to the max volume but I couldn't resize it nor unmount the other disk. Or go to Erase in order to format the disk. Step 3: Visit First Aid and try to repair the disk. Step 2: A boot menu will appear, here, select to choose “Disk Utility”. If you have replaced physical disks, see the Related Information section. Note: Always double check the disk group UUID with the command: esxcli vsan storage list. Step 1: Restart your Mac while pressing and holding the Option key, and then select to choose Recovery partition. esxcli vsan storage remove -u < VSAN Disk Group UUID>.If that’s not the case, this fix is worth trying, here’s how to resolve the error with the recovery partition: To access the disk utility, follow the step below: Step 1: Click on the Spotlight icon from the menu bar. To unmount the volume, start by accessing the disk utility. The simplest solution to unmount volume for repair is to unmount the disk on disk utility. Mind you, this fix will not work if the error was caused by modifying the bootable disk while creating a partition or formating. Method 1: Right Steps to Unmount Volume for Repair on Disk Utility. Fix “Couldn’t Unmount Disk” Error with Recovery Partition Let there be any Mac OS X version as it doesn’t matter (assuming 10.7 to 10.14 and above), this error can be easily resolved only if Disk utility is present on the drive.Īnyways, let’s head towards the actual fixes. Keeping the fact in mind that Disk Utility able to execute from the external drive, we can use it to boot Mac from another bootable drive. Good thing is that a valid solution is available that will help us to resolve the “Couldn’t Unmount Disk” Error on Mac. SEE ALSO iTunes Not Showing Album Artwork? Here's how to fix it. chencho said: EDIT: Seems I need to umount the lxc pct unmount 702 and now it start again.
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