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Problems with hard disk erasing

I want to erase my hard disk and reinstall Yosemite. However when I try that I get a message, error- erasing hard disk failed cause hard disk cannot be deactivated. I have no idea what that means. Has anybody any idea? Thanks.

iMac (21.5-inch Mid 2011), iOS 6.1.2

Posted on Aug 28, 2015 5:44 AM

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Problems with hard disk erasing

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