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How to Troubleshoot Error Code “Couldn’t Unmount Disk” on Mac PC? from avawilliams's blog

 Whenever your device is not permitted to revamp specific accesses or directories in the Disk Utility, such as you are attempting to repair your hard drive. If your device cannot remove or partition of your hard drive, that time users are encountering an error message which says; “Disc erase failed couldn’t unmount disc.”, or “Disk Erase failed with the error: “Couldn’t Unmount Disk”.”

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