You can check this folder for any files that you can’t locate. Files or data that you previously stored in the startup volume are now stored in this new volume, and some of these files may appear in a new folder called Relocated Items. If you upgrade to macOS Catalina or later from an earlier version of macOS, the read-only volume is created during the upgrade process. The Disk Utility app in macOS Catalina shows that Macintosh HD is the read-only system volume and Macintosh HD - Data contains the the rest of your files and data. In the Finder, both volumes appear as Macintosh HD. Your files and data are stored in another volume named Macintosh HD - Data. This volume is completely separate from all other data to help prevent the accidental overwriting of critical operating system files. Command-line can be used to eradicate 'Can't unmount disk' from Mac.MacOS Catalina or later runs on a dedicated, read-only system volume called Macintosh HD. Terminal application allows you to control your Mac operations via the command prompt. When the first aid could not unmount the volume for repair, try using the “Use the terminal application” method to unmount the disk volume. Command-line can be used to eradicate 'Can't unmount disk' from Mac. When you run First Aid, it scans the entire disk for errors and lets you know if there are any it can’t repair. Disk Utility has a First Aid feature that fixes all kinds of issues related to your drives: slow performance, corrupt files, or unexpected behavior. Run First Aid to Repair Your Drive Before Erasing It. Here is that message from recovery mode – First Aid found corruption that needs to be repaired. There, I launch Disk Utility Repair on my startup SSD, but still, Disk Utility greets me with the same message. So, I restarted my Mac and went to Recovery Mode by press-holding Command + R. To repair the startup volume, run First Aid from Recovery.
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