8/29/2023 0 Comments Disk utility mac erase failed![]() ![]() I would like to use this as a learning experience, and any guidance would be greatly appreciated. I know that there is a way to repair and format these disks correctly, but my knowledge just isn't there. When I try to erase the disk through the command line, I receive a "Disk cannot be unmounted" error on every disk. Also attached is an image of the error I receive when I try to re-install MacOS. Solution 3: Use Command Prompt to Force Unmount the Disk. My knowledge is very limited when it comes to hard drives, partitions, etc., and I'm pretty sure I messed it all up.Īttached are images of my disk utility and the errors I receive when I try to erase a disk or perform first aid on the disk. How to Fix the Couldn’t Unmount Disk Error on Mac Solution 1: Use a USB Boot Drive to Repair the Hard Drive. Now, select the external device from the sidebar and click on the Erase button. I did this through the command line and probably messed some stuff up because I can't seem to re-install MacOS. To adjust its security level and fix the erase process has failed on Mac, follow these steps: Firstly, launch the Disk Utility application on your Mac and make sure the external device is connected to it. I have a MacBook Pro A1707 (intel chip) that I wanted to factory reset and remove all data from. Re-installing Mac OS after erasing disks Good morning,
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