New hard drives usually have their jumpers set by default to make them the primary drive, so you'll have to wiggle those around to the right position (using the documentation) so that the old drive boots first. The new drive should come with a floppy disk that will format the drive and, if you want, copy everything over bit for bit. But if you want to boot from the new drive, you'll have to move the jumpers around.
Keep in mind that drives on the same cable can only go as fast as the slowest one in the chain. If both are 7200RPM jobs, then it won't make much difference. If the old drive is 5400RPM or slower, you'll want to put it on a separate data cable in order to get the most performance out of the new one. Make sure the new one it's plugged into the "IDE1" port on the motherboard, where it will be labeled it tiny letters.
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