You can then restore your backup data using the Migration Assistant. If repairs aren't successful: As long as you have a backup of the data stored on the affected drive, reformat the drive and perform a clean installation of your operating system version.However, don't give up try rerunning the repair a few times. Fix the Macintosh HD not mounted with Disk Utilitys First Aid. If First Aid reports a failure: "The underlying task reported failure" message indicates that it failed at making the needed repair. Could not mount disk2s3 comdisk0s2 Volume on disk0s2 failed to mount error: om: btn.If you must have the file, then check your backup for a usable copy. In particular this step: Next make it writable which will require you to enter your password - the /Volumes/Macintosh HD 1 could be different. If you don't need the file, or you can delete the file and easily recreate it. You can examine the files in the DamagedFiles folder.More than likely, both files have become corrupt, but there's a slight chance you can recover one or both of them. The overlapped error indicates that two (or possibly more) files occupied the same location on the drive receiving repair. If First Aid displays an "overlapped extent allocation" error: Disk Utility will create a DamagedFiles folder at the root level of your startup drive.In some previous versions of First Aid, it was necessary to run the repair process multiple times to ensure the repairs were complete that is no longer required. Method 1: Right Steps to Unmount Volume for Repair on Disk Utility Method 2: Fix with a USB boot drive Method 3: Use the terminal application Method 4: Repair with a recovering partition Method 1: Right Steps to Unmount Volume for Repair on Disk Utility. First aid could not unmount the volume for repair Hi there, I really need your help to keep my 1TB HDD safe. If First Aid reports no issues: If First Aid indicates that the drive appears to be okay or that repairs are complete, you're done.
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