Run First Aid to Repair Your Drive Before Erasing It Step 3. What should I do Either make the encryption in FileVault to continue the progress which didn’t work after reading about it and trying things or to erase the HD and start a new install from my Time Machine backup. Show All Devices and Erase the Parent Drive Step 2. When erasing it says Erase process has failed with details saying Couldn’t unmount disk - Operation failed.
#Mac erase process has failed couldn t unmount disk how to#
Quit Disk Utility and return to the Utility Menu. How to erase or reformat a Drive using Disk Utility What if the Erase Button in Disk Utility is grayed Out Step 1.Click on the Apply button, then click on the Done button when it activates.Set the Format type to Mac OS Extended (Journaled.).Click on the Erase tab in Disk Utility's main window.When Disk Utility loads select the drive (usually, the out-dented entry) from the side list.Select Disk Utility and click on the Continue button. In the Volume Format drop-down menu, select Mac OS Extended (Journaled) if you plan to place the Mac Tiger operating system on this drive to make it a bootable drive Click the Restore tab (Mac OSX 10 However, you can delete that hard drive and create a second virtual hard disk Once through, select your Macintosh HD from the Disk Utility tray.The Utility Menu will appear in from 5-20 minutes.Immediately after the chime hold down the Command-Option-Rkeys until a globe appears. Have you ever been in the situation of failed to start erase of disk due to error (-9999, 0)?Are you thinking about the solution to fix this error in a simple way?.Happened to me: disk utility couldn't erase or reformat, tried all of the above, including macissues' bash script for overwriting the disk in terminal, multiple unplug/plug-in for the.
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