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Q: I have downloaded OS X but it says it will not install to Macintosh HD.

So I have a Macbook Air, and have just downloaded the latest OS X El Capitan. But when I go to install it says, 'OS X will not install on Macintosh HD' .

Why is this the case? What do I need to do to make it install? Please somebody help!

MacBook Air, OS X Mavericks (10.9.5)

Posted on Feb 6, 2016 3:51 AM

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Q: I have downloaded OS X but it says it will not install to Macintosh HD.

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