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Question: How do I reformat my hard drive

My 2010 MacBook is very slow booting up . I am running latest os high Sierra . I want to format my HD and reinstall high Sierra.

MacBook, Mac OS X (10.7.5)

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First make sure you have a backup.

Then restart from the recovery partition by holding command-R at startup; erase your drive and reinstall.

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Question: How do I reformat my hard drive