![]() Which are the files and directories open on that volume. Mds 100 root 33r DIR 1,38 192 2 /Volumes/External2 Once you’ve entered that, type your admin user password at the prompt, and you’ll see a list with entries like To discover which files are open on any volume, use the command Don’t just pull the cable of an external disk: not only will your Mac complain, but you could end up damaging the contents of that file, or even the file system on that volume. What you really want to know is which file(s) are open on the volume, so you have a clue as to what to quit to enable the volume to be ejected cleanly. ![]() When it has occurred in the Finder, solutions are harder to come by. It’s also worth double-checking the volume that you’re trying to run First Aid on: if it’s one of the current boot volume group, System or Data, then you’re probably better off doing this in Recovery mode anyway. This seems to be improving steadily, and less likely to occur in Big Sur than Catalina, for example. It’s unusual for this not to work at all, although it may take a couple of attempts. In Disk Utility, the answer seems to be to try again, several times if necessary. Not only can you encounter this in the Finder, but it can also prevent running First Aid in Disk Utility, which may report that it couldn’t because it was unable to unmount the volume you want checked. There, you are good to go and check whether you can access and use the existing data in your external hard drive again.Among the rough edges in macOS is that infuriating message you may see when you try to eject or unmount a volume: it failed because the volume is in use. After this, you can restart the Mac computer and reconnect the external hard drive. Select the untitled external hard drive and click the “Mount” button from the Disk Utility bar. How to recover data from unmounted external hard drive? If you need to rebuild the disk manually, see Repair a disk in a disk set. If you unmount and disconnect a disk and then reconnect the disk later, Disk Utility rebuilds the disk member automatically if you selected “Automatically rebuild” when creating the disk set. ![]() You can also specify the disk name with the fdisk command. Use the “ -l ” option to read data from the /proc/partitions file and display it. How to show Unmounted drives using the “fdisk” command: The format disk or fdisk is a Linux menu-driven command-line tool to create and utilize the disk partition table. What does ” couldn’t unmount disk ” mean?ĭisk Utility usually works trouble-free, but a frustrating “Couldn’t Unmount Disk” error can halt whatever the attempted task is right in its tracks. Select the volume’s drive letter and click “Remove”. ![]() Right-click and select “Change Drive Letter and Paths”. In your Windows VM open “Administrative Tools” ->”Computer Management” -> “Disk Management”. Data recovery labs are extremely successful at this operation but the price can be too high for many users depending upon the importance of the data on the drive. Can you recover data from a hard drive that won’t mount?ĭata recovery software can often detect and recover files from bad disks that are not detected by the operating system and that refuse to mount.
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