Dell Precision 650 - Manual (Page 104)

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.