Dell OptiPlex GX1 - Page 119

Installing Drives 7-5
The drive’s interface connector is a card-edge connector or a header connector, as
shown in Figure 7-5.
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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 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.
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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
card-edge connector
is usually identified by a notch cut about a
quarter of an inch from the end of the connector, as shown in Figure 7-5. A header
connector is usually keyed by the omission of one of its pins (see Figure 7-5), with the
corresponding hole filled in on the connector cable.
The pin-1 end of a connector on a board or a card is usually indicated by a silk-
screened “1” printed directly on the board or card.
header
connector
on drive
interface
cables
colored strip
notch
colored strip
card-edge
connector
on drive