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how do I repair corruption and then erase everything on my external backup drive

My backup external drive has 6 partitions. I need to erase all and re allocate the space for new backups. Disk Utility will not unmount this drive, and First Aid 'found corruption that needs to be repaired'. How do I do this - presumably from Recovery????? H E L P! Please

Mac mini, macOS Sierra (10.12.6)

Posted on Mar 17, 2018 4:11 PM

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how do I repair corruption and then erase everything on my external backup drive

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