I suggest using Ethernet if possibleīecause it is three times faster than wireless. Running Mavericks Running Mavericks I am running Mavericks OX 10.9.1 and am trying to erase an external hard drive that has been partioned. Note : You will need an active Internet connection. Question: Q: Disk Erase failed with the error: Couldn’t unmount disk. Reinstall Lion/Mountain Lion, Mavericks : Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Launch up Terminal.app (through /Applications/Utilities or through a Spotlight search). Couldn’t unmount disk, then you may have to force an unmount through the terminal. While booting up, hold down the Option key to boot using the Recovery Partition. If this is the case, you can try resolving the error using Recovery Partition. The Erase button and wait until the process has completed. If you’re trying on a Mac using Disk Utility to erase a hard drive and it won’t unmount, giving you an error similar to Disk erase failed. If the Couldn’t Unmount Disk error message appears when doing First Aid on your disk or formatting a non-boot disk, the first solution will not work. 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. This video show an alternative way to reformat and erase your SD drive when you receive the following error within the disk utility G. ![]() 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. As the name implies, this does a simple erase of the disk and marks the free space as 'empty' with no file system or partition scheme. ![]() 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. diskutil eraseVolume exFAT MyName /dev/disk2 Started erase on disk2 Unmounting disk Error: -69888: Couldnt unmount disk. This should unmount the drive so you can now do this: method is MBR (Master Boot Record) or MSDOS Windows cannot be installed to this disk. For a single drive system this will probably be /dev/disk0. I installed Arch Linux on a GPT partitioned disk in UEFI mode. 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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