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Power to Hard Drive
The standard four-pin power connector
is called a Molex (Figure 108).
One side of the connector is rounded, while the other side is square.
This prevents the connector from being plugged in the wrong way.
Figure 108: Four-pin Molex power connector These connectors provide power to most drives, including 3.5 hard drives, CD-RW drives, DVD drives, etc. One end has rounded corners so that it can only plug in in one direction. Sometimes, it takes a bit of force or wiggling them about to plug them in or remove them.

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Plug in a molex power connector
to the hard drive (Figure 109
and Figure 110).
Sometimes it takes a bit of force to push a molex power connector all
the way in. It sometimes helps to wiggle it from side to side as you
push it in. They can also be difficult to remove. When removing any
cable or power connector, always try to grab it by the connector and
not by the actual ribbon or by the wire. Pulling too hard on a ribbon
cable or on the wire could damage the wires inside. Pulling on the connector
shouldnt hurt anything.
Figure 109: Plugging in a molex power connector to hard drive Case sits on its side.

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Figure 110: Back of hard drive The four pins on the right are for the Molex power connector.

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How to Build Your Own PC (http://www.PCGuide.com/byop/) on PCGuide.com
Version 1.0 - Version Date: May 4, 2005
Adapted with permission from a work created by Charlie Palmer.
PCGuide.com Version © Copyright 2005 Charles M. Kozierok. All Rights Reserved.
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