General Procedure For Installing Scsi Devices; Figure 9-14. Internal Scsi Cable - Dell Precision 410 User Manual

68-pin SCSI cable
(to hard-disk drive)

Figure 9-14. Internal SCSI Cable

•
If you are installing an internal wide SCSI device
(such as a wide SCSI hard-disk drive), you have a
68-pin internal SCSI cable as shown in Figure 9-14.
One end of this cable attaches to the SCSI host
adapter and the two connectors on the other end of
the cable are used for attaching up to two SCSI hard-
disk drives installed in the hard-disk drive bracket.
NOTE: If you are installing a third SCSI hard-disk
drive, the 68-pin internal SCSI cable you receive
with your upgrade kit is different from the one shown
in Figure 9-14. See "Installing a Third SCSI Hard-
Disk Drive" found later in this chapter.
•
If you are installing an external SCSI device, you
have a shielded external cable that connects to the
external SCSI connector on the SCSI host adapter
card. You have a separate power cable to connect the
SCSI device to an AC power source.
Before installing SCSI devices in your computer, you
may need to configure the termination on your SCSI
device(s). Both types of internal SCSI cables contain ter-
minators on the device end of the cables, so the devices
connected to these cables must have termination dis-
abled. External SCSI cables do not have terminators, so
termination must be enabled on the SCSI device itself.
If you are installing only internal SCSI devices, verify
that termination is enabled on the SCSI host adapter and
disabled for all other internal SCSI devices. If you are
installing both internal and external SCSI devices, verify
that termination is enabled on the external SCSI device
50-pin SCSI cable
(to device in
externally accessible
drive bay)
and disabled for the SCSI host adapter and all internal
SCSI devices.
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 connectors
on a single SCSI host adapter card.
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.
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 cush-
ion it.
Configure the device for a SCSI ID number and ter-
mination, if necessary. For instructions, see the
documentation that came with the SCSI device as
well as "SCSI Configuration Guidelines" found ear-
lier in this section.
Installing Drives 9-11