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3-18 Dell Dimension XPS D
xxx
Systems Reference and Troubleshooting Guide
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Each device attached to a SCSI host adapter card, as well as the card itself, must have
a unique SCSI ID number from 0 to 7. The SCSI host adapter card is typically config-
ured as SCSI ID 7. The boot hard-disk drive must be configured as SCSI ID 0. Any
other SCSI devices attached to the SCSI host adapter card can be configured for any
SCSI IDs from 1 to 6. Refer to the documentation for each device for instructions on
configuring its SCSI ID.
NOTE: There is
no
requirement that SCSI ID numbers be assigned sequentially or that
devices be attached to the cable in order by ID number.
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The SCSI standard requires termination at two end points. If only internal devices are
connected, the SCSI host adapter card is terminated at one end. The device end of
the cable must then be terminated in one of two ways: either the cable contains a ter-
minator, or the device attached to the end connector must be terminated. However, if
you have both internal and external devices attached to the SCSI host adapter card,
the card should have termination disabled. External SCSI cables do not have termina-
tors, so termination must be enabled on the external SCSI device itself. Any devices
attached to inner connectors on the SCSI cable should have termination disabled.
Refer to the documentation for each device for instructions on enabling and disabling
termination.
The type of cabling you receive with a 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 3-14. One
end of this cable attaches to the SCSI host adapter card. 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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68-pin SCSI cable
(to hard-disk drive)
50-pin SCSI cable
(to device in
externally accessible
drive bay)