Installing Drives 7-17
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The type of cabling you receive with your SCSI device depends on the type of device
you are installing.

If you are installing an internal narrow SCSI device (such as a CD-ROM drive or

tape drive)

, you have a 50-pin internal SCSI cable as shown in Figure 7-14. One
end of this cable attaches to the SCSI host adapter. The three connectors on the
other end of the cable are used for attaching up to three narrow SCSI devices
installed in the externally accessible drive bays.

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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 7-14. 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.
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 termi-
nation on your SCSI device(s). Both types of internal SCSI cables contain terminators
on the device end of the cables, so the devices connected to these cables must have
termination disabled. External SCSI cables do not have terminators, so termination
must be enabled on the SCSI device itself.
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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 and disabled for the SCSI host adapter and all internal SCSI
devices.
68-pin SCSI cable
(to hard-disk dr ives)
50-pin SCSI cable
(to devices in
externally ac cessible
drive bay)