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time machine cannot be erased.

I have not used my TM for a year. Would like to erase that partition and disk utility fails, says drive cannot be unmounted. How can i correct this prob. I'm not using TM and would like to reclaim that space.

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Are you backing up to another partition on the same hard drive?


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Hi, Hit this in terminal and then try again with disk utilities

sudo umount -f /Volume/username\ Backup

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Derby Smith will be eternally grateful.
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