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couldn 39 t unmount

diskutil error 9939

diskutil error p Please enter a title You can not post a blank message Please type your message and try again keestux Level points Q diskutil The partition cannot be resized but there is plenty of space This is the error I get The partition cannot be resized Try reducing the amount error - couldn t unmount disk of change in the size of the partition First of all this is really not a helpful message disk erase failed with the error couldn t open device Why can't diskutil tell me how much change I need But worse of all

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