Time Machine - Change External hard drive preference

I have an external hard drive I want to use with Time Machine on my MacBook Pro. I had selected "Don't Use" at one point. How do I change that preference? It's not displaying that drive as an option.
ealebrunDeveloperAsked:
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mccrickCommented:
Make sure that the drive is formatted for Mac before using with Time Machine for better results.
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mrmythCommented:
Plug in the hard drive. Go to Apple > System preferences> Time Machine. You can click on "Select Disk" on there.
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mrmythCommented:
BTW I also like Time Machine Editor http://timesoftware.free.fr/timemachineeditor/ because it allows you to set the times that it backs up, so you don't get system slowness every hour.
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mccrickCommented:
... but try just letting it do its thing first for a week or so. You probably won't notice any slowdowns and you will have a very reliable, up to date backup.
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ealebrunDeveloperAuthor Commented:
The problem is that I would need to reformat the disk for Mac. I ended up buying a new external.
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