5) Run sudo diskutil verifyVolume /dev/diskN (where N is the volume name not the disk name) to try and see if the file system structure can be read at all. 4) Open Disk Utility again and try to repair/fix the partition. 2) Reboot the Mac (without the drive connected) 3) Connect the drive.With the volume unmounted it should allow the process to complete. Almost forgot about this from Disk Utility: Disk Utility can’t repair this disk.If you plan on using the drive for Mac only then you will want to erase the disk. If you have any idea to get the HDD working or even safe the files, I would be really grateful. Sudo diskutil eraseDisk JHFS+ DISKVOLUME disk1 Started erase on disk1 Unmounting disk Error: -69888: Couldnt unmount disk But it didnt work as well. This feature has been tested using OS X v Unable to unmount volume for repair.Again, if the disk throwing the errors is the same as the primary boot partition that Recovery is also on, the above. Go to First Aid to verify and repair the disk, or go to Erase to format the disk. Select Disk Utility from the boot menu.
1.4 Fix Error “Couldn’t Unmount Disk” in Disk Utility for Mac _ ConclusionFix Error “Couldn’t Unmount Disk” in Disk Utility for MacGenerally the “Couldn’t Unmount Disk” error appears when the recently start drive is being modified. 1.3 Way to Forcibly Unmount a Disk by Command Line in Mac OS 1.2 Way to Resolve the Disk Utility Errors through Mac Recovery Partition Bit different on Mac after all methods fail to repair the disk set that you. Unable To Unmount Volume For Repair Mac OS X It IsWe will cover both with a little explanation. Just for the boot drive, it should not matter that which version of Mac OS X it is for (assuming 10.7, 10.8, 10.9, 10.10, 10.12, 10.13, 10.14, etc at least), they just need is that it also has the Disk Utility – which they all do.Similarly, this will permit you to fix the issue, regardless of the purpose, by one of two means, the first is a sure thing to resolve the issue, whilst the other only works occasionally. However, for the former condition where the boot drive is being modified, the simplest fix is to boot from another drive & run Disk Utility from there rather. However, you guys will also need any Mac OS X boot drive in order to complete this task. Way to fix the Unmount Error with a USB Boot DriveThis is the suggested method just because it should constantly fix the error. However, that approach must be used with caution as it also leads to data loss on the drive in query. Here hold down the OPTION key during the start. First of all, attach the USB boot drive to the Mac & restart But others should work as well, if they are installation drives or only recovery drives, the essential thing is that they are bootable & also separate from the initial boot disk that saves the installed OS: Steps However, the above-mentioned steps did the trick & everything was working again as expected.This is the perfect instance of why it’s very valuable to have a beneficial USB thumb drive set up with whatever version of Mac OS X is managing on your Macs. Again it was triggered when attempting to format those partitions. That simply came right along with an individual “partition failed” error. Here perform the real task that threw the “Couldn’t Unmount” errorTherefore I ran into this twice currently, first when attempting to modify partitions on a drive. Head to the “First Aid” and verify the disk, then repair whether needed At the boot menu, you must have to select “Disk Utility” (whether using an Installer disk, pull down the “Utilities” menu in order to access Disk Utility) ![]() Head to the “First Aid” to verify & repair the disk, or head to the “Erase” to format the diskAgain, whether the disk throwing the errors is similar to the initial boot partition that Recovery is also on. Choose “Disk Utility” from the boot menu Restart the Mac holding down the “Option” key and select the Recovery partition And you will then must have to use the process above with a boot disk instead. Just because forcibly unmounting a disk can also cause data loss of the drive being forcibly unmounted. However, this is not the top-suggested option just because of potential for data loss.Similarly, caution must be used with this approach though. In that situation, you will then must have to start from a separate USB drive to resolve the error.Read this guide: In Windows or Linux Find Windows Product Key through Command Way to Forcibly Unmount a Disk by Command Line in Mac OSSome other method utilizes the command line in order to force unmount a disk. Using the sudo which will gain superuser privileges for the task:Sudo diskutil unmountDisk force /dev/disk3Here hit return & enter the admin password just to forcibly unmount the disk from the Mac.When completed so then you can also quit out of the Terminal as normal. Though just for the example syntax here we will use /dev/disk3 to forcibly unmount from command line. You guys are also able to target the disk to unmount as so. Similarly, in which case guys can also first find the disk with:Next, when guys easily find the matching disk to the identifier (/dev/disk1, /dev/disk2, /dev/disk3, etc). Next hit the RETURN key in order to force the drive to unmount.Whether that does not work, so then you can also take this a step further:You probably also have to target the disk by device identifier just to forcibly unmount it.
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