Dell OptiPlex GX620 - Manual (Page 73)

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. Keyed connectors ensure that the pin-1 wire in the cable (indicated by the colored stripe along one edge of the IDE cable—serial ATA cables do not
use a colored stripe) goes to the pin-1 end of the connector. 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.
Power Cable Connectors
Connecting and Disconnecting Drive Cables
When removing an IDE drive data cable, grasp the colored pull-tab and pull until the connector detaches.
When connecting and disconnecting a serial ATA data cable, hold the cable by the black connector at each end.
Like IDE connectors, the serial ATA 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.
Hard Drive
1 colored stripe on IDE cable
2 interface cable connector
3 interface connector
NOTICE: When you connect an IDE interface cable, do not place the colored stripe away from pin 1 of the connector. Reversing the cable prevents the
drive from operating and could damage the controller, the drive, or both.
IDE Drive Power Connector Serial ATA Power
Connector
1 power cable
2 power input connector
CAUTION: Before you begin any of the procedures in this section, follow the safety instructions in the Product Information Guide.