Attach the IDE cable connectors from the ribbon cables both into the old hard drive and the secondary hard drive. The connector furthest from the motherboard (often black) should be plugged into the primary hard drive. The middle connector (often gray) will be plugged into the secondary drive. Most cables are keyed to fit only in a specific direction on the drive connector but if it is not keyed, place the red striped portion of the IDE cable towards pin 1 of the drive.
Installing a Second IDE Hard Drive
By Mark Kyrnin, About.com
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