Thus, if you are facing the same below-shown error, read this article till the end and get rid of it with less effort. One such error message is ‘Disk Erase failed with the error: Couldn’t unmount disk’ or “ Disc erase failed couldn’t unmounts disc’. Mostly you can rely on Disk Utility but sometimes it fails to solve the disk issues and throws different errors. Luckily, it can be fixed by using recovery partition & command line.ĭisk Utility plays a vital role in fixing disk errors and issues on Mac OS. No doubt, it’s the most annoying issue encountered by Mac users. I suggest using Ethernet if possibleīecause it is three times faster than wireless.Couldn’t unmount disk error message generally occurs on Mac devices when trying to repair, format, partition, or modify the boot drive/internal disk using Disk Utility. Note : You will need an active Internet connection. Reinstall Lion/Mountain Lion, Mavericks : Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. The Erase button and wait until the process has completed. The Security button and set the ZeroData option to one-pass.
Set the format type to Mac OS Extended (Journaled.) Optionally, click on Click on the Erase tab in the DU main window.ģ. After DU loads select your startup volume (usually Macintosh HD) from the Select Disk Utility from the main menu and click on the Continue button.Ģ. Install or Reinstall Mavericks, Lion/Mountain Lion from Scratchīe sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.ġ. This should unmount the drive so you can now do this: For a single drive system this will probably be /dev/disk0. You should also see the name of the disk such as "Macintosh HD." Note down the disk identifier.
If will look like /dev/diskn/ where "n" is an integer starting at 0. From the listing look on the left column for your disk identifier. If you are, then you neeed to do the following: Are you booted from the Recovery HD partition? If not, then you need to first boot from the Recovery HD before you can erase the Macintosh HD.
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