![]() ![]() Then this: diskutil erasedisk is the ID of your disk.Type this very carefully (sudo might not be necessary): sudo diskutil unmountDisk force /dev/disk2.(note: be EXTREMELY careful, ask you could wipe your computer if you do this wrong) See the Apple Support article About macOS Recovery on Intel-based Mac computers. To erase the volume, you need to run Disk Utility in macOS Recovery. Thankfully I ended up fixing it quickly (with a little googling). To adjust its security level and fix the erase process has failed on Mac, follow these steps: Step 1. If the Erase button is dimmed, the selected volume can’t be erased because it’s in use. It says again Forced unmount of disk0 failed: at least one volume couldn’t be unmounted Unmount was dissented by PID 0 ( kernel. ![]() When using PARTITION function to erase the existing partition, it would proceed 'Preparing to remove partition' but would take ages & never completes it - I would have to quit Disk Utility to force stop it. diskutil unmountDisk force dev/disk0 etc. Disk Erase failed with the error: Couldn't unmount disk'. Click Done to continue Then i tried terminal. I was getting things like: ”could not modify partition map” and “couldn’t unmount disk.” Other things could be things like “couldn’t open device.” Erasing an External USB or Hard Drive that keeps failing in Disk Utility But when i try (SSD) erase, it says Erase process has failed. 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 The simplest solution to unmount volume for repair is to unmount the disk on disk utility. Right-click the Finder icon at the leftmost of the Dock while holding the Option key. You get this error, and the details vary depending on the format type you try Solution Disk Erase Failed with error Couldnt unmount disk mac. To stop Finder from accessing the drive, you need to relaunch it with the steps below. 5) Run sudo diskutil verifyVolume /dev/diskN (where N is the volume name not the disk name) to try and see if the file system structure can be read at all. 4) Open Disk Utility again and try to repair/fix the partition. That might be because the disk is a Windows/Linux bootable formatted as FAT-32, which OSX cannot read.Īnd then when you try to erase in disk utility, the USB is greyed out and First Aid doesn’t work, you can’t repair it, and you can’t mount or unmount it. 2) Reboot the Mac (without the drive connected) 3) Connect the drive. If will look like /dev/diskn/ where 'n' is an integer starting at 0. You should also see the name of the disk such as 'Macintosh HD.' Note down the disk identifier. ![]() Are you trying to erase a USB drive on your mac but getting this error as soon as you insert it? Disk erase failed could not unmount disk 0 Comments For a single drive system this will probably be /dev/disk0. ![]()
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