Method 2: Manually Unmount Disk in Disk Utility The Terminal app will then display all the activity affecting your external drive in real-time (as they happen). To check the activity occurring on your external drive, open the Terminal app (Finder > Applications > Utilities) and execute the following command: sudo fs_usage |grep yourdrivename If your drive failed to unmount because it is currently in use, you can help macOS by figuring out which apps are using the disk and closing it yourself. It’s possible that macOS is failing to unmount your disk because it’s struggling to close the apps or processes. Method 1: Check If Volume Is In Use By Other Apps We’ll demonstrate all methods in the sections below. However, there are scenarios where the unmounting process gets stuck or blocked because of errors (or other factors).įortunately, there are ways to forcefully unmount a volume that could not be unmounted. How to Fix Could Not Unmount the Volume ErrorĪs we described in the previous section, unmounting is crucial for macOS processes – especially if you want to repair a malfunctioning drive. If macOS struggles, it’s a clue that something is wrong. for privacy purposes)ĭue to all of these processes, a healthy drive should be easily mounted and unmounted by the operating system. You may have unmounted the volume manually yourself (e.g. Disk errors may cause the unmounting themselves or at least prompt macOS to unmount connected drives to prevent corruption. As part of its security measures, encrypted volumes may automatically be unmounted when you shut down your Mac. Whenever you set up or use Time Machine, it may mount and unmount designated volumes as part of the backup process. Disk Utility operations like formatting, partitioning, or repairing a disk may unmount volumes as part of their processes. As we mentioned, macOS will “tidy up” your drive’s file system to make sure it’s safe to physically disconnect from the port. Recognizing them is key to avoiding corruption and other errors as well as troubleshooting possible reasons why you can’t unmount a drive. There are loads of scenarios where macOS unmounts your drive. This is what “ safely ejecting” a drive means!
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