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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. Keyed connectors ensure that the pin-1 wire in the cable (indicated by the colored stripe 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 usually indicated by a silk-screened "1" printed directly on the board or card.
SCSI Device Installation Guidelines
This section describes how to configure and install SCSI devices in your computer. To install a SCSI device, you can use one or both of the following SCSI
controllers:
l The SCSI connector on the system board. To locate the SCSI system board connector, see the system board illustration (for the Dell Precision 450
computer, see "System Board Components" or for the Dell Precision 650 computer, see "System Board Components") or the interior service label.
NOTICE: If your system was purchased with a Serial ATA hard drive, the system includes the newer style Serial ATA style power connector. If you are
adding a Serial ATA hard drive to a system that was not originally equipped with one and the drive you are adding requires the new style Serial ATA
power connector, you may need to obtain a power adapter cable from Dell. If you need a Serial ATA power adapter cable, see Contacting Dell.
IDE Drive Connector
Serial ATA Connector
1
power cable
2
power input connector
1
interface connector
2
colored stripe on cable
3
interface cable
NOTICE: When you connect an 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.
NOTE: The system board SCSI controller supports hard drives only. Do not connect CD or DVD drives, tape drives, DAT drives, and so on.