![]() ![]() Windows are accessing folders on the disk. Make sure there are no applications currently running from theĭisk you want to initialize.Alternatively, if you have theįinder set to display disks on the Desktop, you can drag the disk to The left pane of the Finder toolbar window, an eject button shouldĪppear to the right of the disk's listing it looks like an up-facingĪrrow with a line underneath it. Try to unmount the disk manually from the Finder.If you are still having trouble unmounting the disk, try the To boot from a CD, DVD, or different hardĭrive, see ARCHIVED: On a Mac, how do I change my startup volume or boot from an You should always boot from a drive other than the one you're trying ![]() Initialized if the drive is in use, it cannot be unmounted, and thus Enter your admin username and password by clicking the padlock. Select System Preferences from the Apple menu. A drive must be unmounted or taken offline before it can be The couldn’t unmount disk external hard drive mac error on older Macs that don’t have a T2 security chip: Insert a disk containing a bootable installation of macOS. This error means that the hard drive can't be unmounted because a file ![]() May get an error message about the program being unable to unmount the ![]() In Mac OS X, when you attempt to initialize a disk withĭisk Utility or a third-party drive formatting utility, you Information here may no longer be accurate, and links may no longer be available or reliable. This content has been archived, and is no longer maintained by Indiana University. ![]()
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