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. (For example to Erase/Partition the disk). Attempt again to perform whichever task caused your ‘Couldn’t Unmount Disk’ error.Also perform a permissions repair if required.
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