Replace VOLUMENAME with the name of a volume on the disk you are trying to unmount. It seems like you want to repair your external drive but it is giving you an error that it is not able to unmount and repair. Following this, attempt to Erase/Partition the drive again in Disk Utility. Using the above command can interrupt file read/writes, which can cause file corruption. However, since you are erasing the drive anyway, this doesn’t really matter in your situation. I would recommend you read this article and use it to help troubleshoot the issue. If you try to verify a volume that is not your startup disk but for some reason Disk Utility can't unmount the volume (for example, the disk may have open files), the verification will appear to start but then stop without displaying any alert message. #MAC DISK UNITLITY UNABLE TO UNMOUNT VOLUME FOR REPAIR VERIFICATION# Verifying volume “Storage” The disk “Storage” could not be unmounted Could not unmount disk for verification, attempting live verify I'm on a Mac OS Catalina trying to wipe a drive via command line. APFS Volume Macintosh HD 10.8 GB disk1s1 2: APFS Volume Macintosh HD - Data 843.8 GB disk1s2 3. I forced unmount and get the error unmount disk failed: at least one volume. If you try to repair a disk that cannot be unmounted, the repair will appear to start, but then stop as Disk Utility displays this message: "Repairing disk failed with error. If you look in the Console (/Applications/Utilities/), you will see an entry like this: How do I fix a Mac OS X White screen that is consistent when booting from a. Verify and Repair disk "Storage." The disk “Storage” could not be unmounted. Disk Utility is unable to repair your internal drive if your Mac is currently booted. In some rare situations, your computer might not respond for several seconds. Method 1: Right Steps to Unmount Volume for Repair on Disk Utility. If you cannot determine which files are open on the disk that you want to verify or repair, restart your computer and then mount the disk again, or start up from your Mac OS X Install DVD or CD to repair.
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