AMD Athlon Manual page 56

A Guide to Building a PC with an AMD Athlon™ Processor
22914B/0—September 1999
Step 30. Install the Primary and Secondary IDE Cables
On the system board, there are two forty-pin connectors (see Photo 42). One is marked
PRIMARY, this is for the high-speed storage devices (the hard drive). The other is
marked SECONDARY, this is for the low-speed storage devices (the CD-ROM and
some tape backup drives could use this). In Photo 42, the pins are surrounded by a
plastic shroud. Most motherboards will have these plastic shrouds.
As Photo 11 on page 21 shows, the cables for the IDE-type drives are similar in
appearance, but very different in wire count. The cable with the fine wires is the high-
speed hard-drive cable. This goes into the PRIMARY connector.
On the board, one end of the connector is marked 1 2 (see the circles in Photo 42), the
other end is marked 39 40. The edge of the cable that is red (or marked with red ink)
must be next to the 1 2. Push the hard drive cable squarely onto the PRIMARY pins.
Next take the cable from the CD-ROM drive (the cable with the larger wires) and place
on the pins marked SECONDARY, again pushing it on squarely and firmly.
1, 2 marking
Photo 42. Primary and Secondary IDE Cables
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