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C
onnecting Drives
When installing a drive, you connect two cables—
a direct current (DC) power cable and an interface
cable—to the back of the drive. Your drive's power input
connector (to which you connect the DC power cable)
resembles the connector shown in Figure 7-4.
Figure 7-4. DC Power Cable Connector
The drive's interface connector is a card-edge connector
or a header connector, as shown in Figure 7-5.
notch
card-edge
connector
on drive
colored strip
header
connector
on drive
colored strip
Figure 7-5. Drive Interface Connectors
When attaching the interface cable to a drive, be sure to
match the colored strip on the cable to pin 1 of the drive's
power input
connector
DC power cable
interface
cables
interface connector. For the location of pin 1 on the
drive's interface connector, see the documentation that
came with the drive.
When disconnecting an interface cable from the system
board, be sure to press in on the locking tabs on the cable
connector before disconnecting the cable. When attach-
ing an interface cable to the system board, be sure that the
locking tabs snap into place, ensuring that the cable is
firmly attached to the connector on the system board.
Most interface connectors are keyed for correct insertion;
that is, a notch or a missing pin on one connector matches
a tab or a filled-in hole on the other connector (see Fig-
ure 7-5). Keying ensures that the pin-1 wire in the cable
(indicated by the colored strip along one edge of the
cable) goes to the pin-1 end of the connector.
The pin-1 end of a connector on a board or a card is usu-
ally indicated by a silk-screened "1" printed directly on
the board or card.
CAUTION: When connecting an interface cable,
do not reverse the interface cable (do not place the
colored strip away from pin 1 of the connector).
Reversing the cable prevents the drive from
operating and could damage the controller, the
drive, or both.
I
nstalling a Drive in a 5.25-Inch
Drive Bay
The 5.25-inch drive bays can accommodate any of the
following types of half-height drives:
•
A diskette drive or tape drive that uses the diskette/
tape drive interface on the system board
•
A CD-ROM or tape drive that uses the secondary
EIDE interface on the system board
•
A CD-ROM or tape drive that uses its own controller
card
NOTE: For information on configuring, connecting, and
installing SCSI drives, see "Installing SCSI Devices"
found later in this chapter.
Installing Drives
7-3
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