Dell PRECISION 530 - Manual (Page 76)

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SCSI devices installed by Dell are configured correctly during the
manufacturing process. You do not need to set the SCSI ID for these SCSI
devices.
If you attach additional optional SCSI devices, refer to the documentation
for each device for information about setting the appropriate SCSI ID
number.
NOTICE: Dell recommends that you use only SCSI cables purchased from
Dell. Cables purchased elsewhere are not guaranteed to work with Dell
computers.
Device Termination
SCSI logic requires that termination be enabled for the two devices at
opposite ends of the SCSI chain and disabled for all devices in between.
Dell recommends that you use terminated cables and that you disable
termination on all devices. See the documentation provided with any
optional SCSI device you purchase for information on disabling
termination on the device.
General Guidelines
Follow these general guidelines when installing SCSI devices in your
computer:
• Although you install SCSI devices essentially the same way as other
devices, their configuration requirements are different. For details on
configuring your particular SCSI subsystem, refer to the
documentation for your SCSI devices and/or your host adapter card.
• Configure the device for a SCSI ID number and disable termination, if
necessary.
• To use an external SCSI device, you must have a SCSI controller card
installed in your computer. Connect one end of the external SCSI
cable to the connector on the back of the SCSI device. Attach the
other end of the external SCSI cable to the connector on the controller
card installed in the computer.