there are settings on each hard drive... They are called jumper settings. Your main drive (200gb) should be put as a master, and the old drive (20gb) should be put as a slave. The jumper settings are small and usually on the back panel where all the wires plug in. It will be a little plastic piece and you pull it off of two little wires... Very easy to miss if your not looking for it. basically you can only have one master and one slave per ribbon. Did that help?
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