![]() If First Aid keeps reporting "Unable to unmount volume for repair" when scanning your external drive, you can do it in macOS Recovery. Since OS X 10.7 Lion, every Mac has a recovery partition that users can turn to when they are having issues with the regular macOS. To get rid of the program, look for the uninstall feature in the preferences or check the website for a guide. Please note that simply dragging the software to Trash doesn't clear the installation files on your system fully. If it doesn't have an update yet, you should completely uninstall the software from your Mac. In this case, you need to check and install the available updates to the software on the manufacturer's official website. : (-69673)." if either the software or the firmware isn't working properly, especially after a macOS update. You may encounter "Unable to unmount volume for repair. When you get to the Finder, again check the. Don't forget to replace disk_identifier with yours.ĭiskutil unmountDisk force /dev/disk_identifier Uninstall the drive manufacturer's softwareĭo you have any of the drive manufacturer's software installed on your Mac that allows you to unlock, maintain, or back up to or from the drive? When such software exists, there's often a related firmware on the drive. When you get to the finder, go to System Preferences, click on Time Machine, and flip the TM 'on/off' switch to OFF. To do it, execute the command below in Terminal. This way, you can terminate any background processes that are secretly using the drive. If you can't unmount the drive on Mac with the aforementioned methods, you should force unmount the drive in Terminal. If, instead, the command returns the error, " Error: -69673: unable to unmount volume for repair," you need to force unmount the disk. Now, the drive will be grayed out in Disk Utility and you can re-run First Aid to check whether the issue is gone. Once it's done, Terminal will report back that the targeted disk or volume is unmounted. diskutil unmountDisk /dev/disk_identifierSuppose the identifier of the drive is disk2, then the command will be diskutil unmountDisk /dev/disk2. Execute the following command to unmount the drive in question.Note down the disk identifier of the drive that First Aid can't unmount on Mac.Run the command below to list all drives connected to your Mac.Open Terminal from the Applications > Utilities folder.Nevertheless, if your drive is exhibiting behaviors, such as: : (-69673)." If your drive is in good condition, it likely is actively used by other programs or processes, which are preventing First Aid to unmount it. There are several reasons for "Unable to unmount volume for repair. Recover lost files when facing 'Unable to unmount volume for repair' on Mac How to fix 'Unable to unmount volume for repair 69673' on internal drives? How to fix 'Unable to unmount volume for repair 69673' on external drives? Guide to "Unable to unmount volume for repair. Here, we will help you get your lost files back and fix the "Unable to unmount volume for repair. : (-69673)." As the message implied, the error occurs due to a volume could not be unmounted. However, it sometimes fails its job and shows the error that reads " Unable to unmount volume for repair. I tried force unmounting the disk using the Terminal command, but the disk doesn't actually show up in /Volumes/, so it didn't work.Disk Utility First Aid is the common go-to if you need to check and repair an internal or external drive on Mac. Back up as many of your files as possible, reformat the disk, and restore your backed-up files." If I attempt to erase the partition, it says "Volume Erase failed with the error: Couldn’t open disk." And if I attempt to erase the Disk (one level up from the partition in the Disk Utility), it says "Disk Erase failed with the error: Couldn’t unmount disk." However if I try to repair the Time Machine partition, it says "Disk Utility can’t repair this disk. The HD DOES show up in the Disk Utility Program. The light on the hard drive is blinking, indicating it thinks its being accessed, but I don't think it's actually doing anything. I've tried unplugging/replugging the HD and restarting the computer, but it doesn't show up in finder or Time Machine anymore. The hard drive disappeared from the finder window and progress on backing up in the Time Machine window disappeared. I was backing up my Mac today (Time Machine) when I think I jostled the USB cable.
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