7-12 Dell OptiPlex GXa Mini Tower Systems Reference and Installation Guide
tion is enabled on the external SCSI device and disabled for
the SCSI host adapter and all internal SCSI devices.
General Procedure for Installing SCSI Devices
Configure and install one or more SCSI devices in your
computer as follows:
1. Determine which connector on the internal SCSI
cable you will attach to each SCSI device.
See “SCSI Configuration Guidelines” found earlier
in this section.
2. Unpack each SCSI device and prepare it for
installation.
Configure the device for a SCSI ID number and, if
necessary, enable or disable termination. For instruc-
tions, see the documentation that came with the
SCSI device as well as “SCSI Configuration Guide-
lines” found earlier in this section.
3. If you are installing a SCSI host adapter card,
configure the adapter card.
For instructions on configuring the card, see the doc-
umentation that came with the adapter card as well
as “SCSI Configuration Guidelines” found earlier in
this section.
4. Install the SCSI devices as appropriate.
•To install a SCSI hard-disk drive, complete
steps3 through 7 of “Installing an EIDE Hard-
Disk Drive in the Hard-Disk Drive Bracket”
found earlier in this chapter. Then continue with
step 5 of this procedure.
•To install a SCSI tape drive, CD-ROM drive, or
DAT drive, complete steps 2 through 6 of
“Installing a Drive in a 5.25-Inch Drive Bay”
found earlier in this chapter. Then continue with
step 5 of this procedure.
•To install an external SCSI tape drive, continue
with step 5 of this procedure.
5. If you are installing a SCSI host adapter card,
install it in an expansion slot now.
See “Installing an Expansion Card” in Chapter 6.
If a SCSI host adapter card is already installed,
remove, reconfigure, and reinstall the card at this
time. See the documentation that came with the
SCSI host adapter card as well as “Removing an
Expansion Card” and “Installing an Expansion
Card” in Chapter 6.
Connect the hard-disk drive access cable to the SCSI
host adapter card and to the HDLED connector on
the riser board (see Figure 6-3). This cable carries a
signal from the SCSI host adapter card to the hard-
disk drive access indicator on the computer’s front
panel whenever one of the SCSI hard-disk drives is
accessed.
6. Attach the SCSI cable to each SCSI device.
For additional instructions on connecting SCSI
devices, see “SCSI Cable and SCSI Termination”
found earlier in this section.
If you are installing an internal SCSI device, firmly
press the SCSI cable’s header connector onto the 50-
or 68-pin connector on the back of the device.
CAUTION: Do not connect devices to all three con-
nectors (internal narrow connector, internal wide
connector, and external connector) on a single SCSI
host adapter card. Such a configuration is a viola-
tion of the SCSI specification. You can safely
connect devices to any two of these three connec-
tors on a single SCSI host adapter card.
CAUTION: Ground yourself by touching an
unpainted metal surface on the back of the
computer.
CAUTION: When you unpack the drive, do not
set it on a hard surface, which may damage the
drive. Instead, set the drive on a surface, such as
a foam pad, that will sufficiently cushion it.
CAUTION: You must match the colored strip
on the cable with pin 1 on the drive’s interface
connector to avoid possible damage to your
system.