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This question already has an answer here:

I have 13 inch mid 2010 macbook pro. Just installed new 1T hard drive but now am hesitating on what to do next. I have my old hard drive converted to external drive and a back up drive as well.

merged by bmike Aug 1 '16 at 1:59

This question was merged with How do I get an operating system onto a new hard drive? because it is an exact duplicate of that question.

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