Step 4: Setup the required information (i.e. Step 2: Select the unmountable Macintosh HD from the side bar.
Step 1: Boot your Mac to macOS Recovery mode and select Disk Utility from the macOS Utilities menu. Choose your startup disk (named Macintosh HD by default) from the sidebar and click the Erase button.įor security reasons macOS Catalina splits the logical boot volume, in your case "Macintosh HD" into two physical volumes, one for all the system files and another for the use data which has " - Data" put on the end of the name.Choose Disk Utility and click Continue.Hold down the Command and R keys on the keyboard and turn on the Mac.
How to reset a MacBook Air or MacBook Pro How do I restore factory settings on my MacBook air? New disks are added live, the RAID volume does not need to be unmounted. You can release the keys once you see the Apple logo. A script could interpret the results of diskutil list -plist and use diskutil. To enter Recovery Mode on an Intel-based Mac, restart it and immediately press and hold Command-R. You need to put your MacBook ($639 at Amazon) into Recovery Mode in order to erase all of your data and reinstall MacOS. How do you restore a Mac to factory settings?įactory reset.
In the Disk Utility app on your Mac, select the volume you want to mount. If you eject a volume, you can use Disk Utility to mount the volume so that it's available in the Finder. 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. What happens if you unmount Macintosh HD?
How to unlock the Recovery HD on OS X Lion If you receive an error message such as the update volume could not be mounted for the target or the volume is not mounted when updating to macOS Monterey. How do I unlock the volume on my Macintosh HD? Disk Utility failure: The faults of disk utility make Macintosh HD not mounted. Sometimes, the damaged file system of the hard drive can also make the hard drive non-mounted in the Finder. Why is my Macintosh HD not mounted?Ĭorrupted File system: There is also the possibility that the drive is corrupted because of logical errors, bad sectors, etc. This will definetely unmount the entire disk and all its related volume.
If you upgrade to macOS Catalina 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. MacOS Catalina runs on a dedicated, read-only system volume called Macintosh HD.