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I have my MacBook Pro backed up with Time Machine on a WD external passport drive. Time Machine no longer recognizes the drive and I cannot open any other files that are on it. I tried disk repair, but get the error message "Could not unmount Disk". Anyone know what this means or what to do next?

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Disk Utility can have some problems if the partition is corrupted. DiskWarrior can usually repair any issues with the drive though.

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