Dell OptiPlex GX280 - Manual (Page 63)

When you install a drive, you connect two cables—a DC power cable and a data cable—to the back of the drive and to the
system board.
Drive Interface Connectors
IDE Drive Connector Serial ATA Connector
1 interface connector
2 interface cable
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 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 Connector
1 power cable
2 power input connector
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.