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Helpful answers
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Aug 4, 2016 3:29 PM in response to Daniel Croninby think.different,Is this the internal or an external drive?
Remember if it is the boot drive, then you can't erase it it unless you boot into the imac via another boot drive, or the recovery partition if the os is 10.7 Lion or newer.
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Aug 4, 2016 3:55 PM in response to Daniel Croninby macjack,Hi Daniel, just to add to think.different's good advice...
If you have another Mac available you can boot yours in
Target Disk Mode and make a backup of your files to an external disk.
Share files between two computers with target disk mode - Apple Support
After the backup, use disk utility on it from the other Mac, if it sees it.