I hope this helps someone else, as I struggled with this for a few hours. Once you have done this, you can format the entire Volume. You do this by selecting the partition in the left pane, and OPTION+CLICKING the 'Unmount' button.
Unmount disk osx mac os#
In Mac OS X, select the disk on the desktop and either drag the disk to the trash (which changes to an Eject icon), or select "File→Eject" from the Finder's menu bar. THE EASIEST WAY TO UNMOUNT: Simply use Disk Utility to 'Force Unmount'. In order to unmount a disk in Windows, open "My Computer," select the disk, and click the "Eject this disk" option in the left sidebar.
The erase fails instantly as Couldn’t unmount disk appears in the Details text box. Several types of disks can be unmounted, including external hard drives, USB flash drives, iPods, flash memory cards, and disk images. The Disk Utility in Recovery Mode is unable to erase the top level disk containing the Macintosh HD (and with all disks/volumes showing, ie.: Apple Disk Image Media which contains OS X Base System volume). Intel processor: Turn on your Mac, then immediately press and hold these two keys until you see an Apple logo or other image: Command () and R. Therefore, before removing an external data storage device, such as a USB flash drive, the disk should be unmounted to avoid possible data corruption. Since unmounting a disk prevents the computer from accessing it, there is no risk of the disk being disconnected in the middle of a data transfer. When a disk is mounted, it is active and the computer can access its contents. Of course, in order for a disk to be unmounted, it must first be mounted. If the Security Options button is not available, Disk Utility cannot perform a secure erase on the storage device.Unmounting a disk makes it inaccessible by the computer. Secure erase options are available only for some types of storage devices. (Optional) If available, click Security Options, use the slider to choose how many times to write over the erased data, then click OK. If the Scheme pop-up menu isn’t available, make sure you selected the storage device you want to erase-it’s at the top of the hierarchy.Ĭlick the Format pop-up menu, then choose a file system format. For many users, the easiest way to unmount a drive in Mac is to either just drag a volume into the Trash, use the eject keys, disconnect the drive, or use one. If the Unable to Unmount error is triggered by First Aid or non-boot partition formatting, you may. Ĭlick the Scheme pop-up menu, then choose GUID Partition Map. Use the Mac Recovery partition to fix disk utility errors. In the sidebar, select the storage device you want to erase, then click the Erase button. Don't worry, launchd will restart it, but this time it should behave a bit better. If you want to erase any other type of storage device: Double-click Disk Utility in the /Applications/Utilities folder. Open up Activity Monitor Locate the mdsstores process Click once to highlight the mdsstores process Click on the X icon just above 'Process Name' Click on Force Quit Enter your Admin credentials and click Okay Now retry your unmount.
Note: If you want to get your Mac ready to trade in, sell, or give away, and your computer is a Mac with Apple silicon or an Intel-based Mac with an Apple T2 Security Chip, use Erase Assistant.
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