How can I format an external hard drive to be used with Time Machine?

siliana August 13, 2010
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I need to format my Lacie hard drive 500 GB, so I can use it with Time Machine. I want to reinstall the system on my Macbook Pro because when I tried to use Time Machine with this hard drive where I had the previous back up it takes too long. So I think I need to format again the external hard drive.

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