8/3/2023 0 Comments Unmount disk osx(For example to Erase/Partition the disk). This should unmount all volumes of the physical drive:Ĥ) Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error. For a single drive system this will probably be ‘disk0’ :Ģ) Now enter the following where ‘x’ is your disk identifier: sudo diskutil unmountDisk /dev/diskxģ) Press RETURN. In my example below, the disk name is ‘Server’. You should also see the name of the disk such as ‘Macintosh HD’. It will look like ‘diskx’ where ‘x’ is an integer starting at 0. From the listing, look in the Identifier column for your disk identifier. (Or if you are booting to your own bootable drive with a full system, open Disk Utility from /Applications/Utilities). You can try booting from OS X Recovery (by holding ‘CMD’ + ‘R’ keys at startup) or an external drive and use the command line to attempt to unmount or erase the disk:ġ) Once booted from OS X Recovery, select Terminal from the Utilities pull down menu.
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