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Connect the USB boot drive to your Mac, then reboot.Here are the steps you need to follow to resolve this error using a USB boot drive: You can use an installation drive or a recovery drive, as long as it is bootable and it is separate from the primary boot disk where your macOS is installed. DISK UTILITY MAC WILL NOT OPEN MACIf “Couldn’t Unmount Disk” error occurs when you are trying to modify the boot drive, the easiest solution is to boot your Mac using another drive, and then run Disk Utility from that disk. Once you’ve completed the steps above, you can now proceed with the main solutions: Solution #1: Use a USB Boot Drive to Repair the Hard Drive. This should fix any errors related to corrupted junk files or cached data on your Mac.
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