![]() Enter the command below to acquire the identifier of your disk. Open Terminal from the Applications > Utilities folder. Then attempt to erase or partition the external disk again. In its place would be "disk0s2." It is this indented entry that you want to erase. If you still cant unmount the disk on Mac, you can force unmount the drive in Terminal. You might see that it is displayed on the list as: To be sure you do this right, please observe that the drive may appear in the list as ghosted because it is unmounted. Use the device reference in this next command. It will appear similar but not the same as this: /dev/disk0s2. In the output, you should find your Fusion drive listed. At the prompt paste these lines individually pressing RETURN at the end of each line. If that doesn't work then quit Disk Utility and open Terminal from the Utilities' menu. If your volume has spaces in the name, be sure to escape the spaces with \, eg: diskutil unmount /Volumes/Disk\ Name Or use quotes to avoid confusion. On newer Macs with the recovery partition, you can enter macOS Recovery, then. It is recommended that diskutil (1) (as in, 'diskutil unmount /mnt') be used instead. The solution is to boot from a different volume from the one you intend to format. If you still can't unmount the disk on Mac, you can force unmount the drive in Terminal. Note or copy the name of the disk you want to unmount. External Hard Drive, Usb drive, Flash drive, Yosemite OS X, El Capitan OS X, Macbook pro, iMac, macbook air, macbook, macbook retina display, macbook retina. Press Return to see the list of connected disks. Starting with Vista you need to manually unmount the hard disk to successfully write to it, or in other words: make sure the disk you edit has no mounted file. Type diskutil list in the Terminal window. After doing that click on the Unmount button in the toolbar to see if the disk disappears from the Desktop. Due to the complex and interwoven nature of Mac OS X, umount may fail often. To unmount a disk in Terminal: Open Terminal in Applications > Utilities or choose Terminal from Utilities in Recovery Mode. Shut down your Mac, then unplug all nonessential devices from your Mac. Try repairing the disk in Disk Utility using First Aid. In Mac OSX, Unix and Linux everything is a file, so you can use this command to monitor opened processes, files, devices…etc.Boot from your USB bootable drive. You may see Fseventsd process and it’s process id in the list, use “sudo kill -9” to kill this process.Īdditional Information: List Open Files (lsof) is a useful tool that will show you opened files. “lsof | grep” then drag the drive to the terminal window to complete the path to the drive’s mount point, and press enter. To terminate the Fseventsd process, login to Terminal and type in: Events are logged in the hidden “.fseventsd” directory at the root of the drive. It is to log the changes in the file system. You may want to login to Terminal mode and check if there is any process locks down the drive for example: fseventsd process.įseventsd is a file system “events” notifier, running as a daemon process, used by Spotlight, Time Machine and other 3rd party softwares. There is a chance that some background process may lock the drive and prevent it from being formatted, please turn off Spot Light and Time Machine.įor more information about Spot Light and Time Machine, please visit:ģ. If your drive has been used under Windows, it might be in Windows NTFS / FAT format, you will need to change the partition format to GUID partition or Apple Partition Map in order to format and mount the drive in disk utility.įor more information about partition in Mac OS disk utility, please check: How do I partition my drive in Mac OS X®?Ģ. For example, when you eject a hard disk or SSD, it's still connected to the. Click the padlock and type in your admin username and password. ![]() ![]() Click on the Apple menu and choose System Preferences. ![]() ![]() Please do the trouble shooting as following:ġ. A drive can be connected but not available to your Mac. If Couldnt Unmount Disk or erase process has failed error occurs, the simplest solution is to boot the Mac system and run Disk Utility on the disk. Plug in a disk with a bootable install of macOS on it. In order to force your Mac to unmount disk, follow the below steps: On your Mac PC, go to the Disk Utility, choose a disk set that you wish to unmount. ![]()
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