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20 ST12450W/WD Installation Guide, Rev. B
Terminating the drive
If you are installing a Barracuda 2, 2HP drive in a system
that has other SCSI devices installed, terminate only the
end devices on the SCSI chain. A SCSI “device” is any
disc drive, scanner, tape-backup unit, or other piece of
hardware connected to your system using the SCSI bus.
The top example in Figure 3 shows an internal hard disc
at one end of the SCSI bus with the SCSI controller at the
other end (both are terminated). The bottom example
shows two additional SCSI devices connected exter-
nally—this means the SCSI controller is no longer on the
end of the SCSI chain and should not be terminated.
Internal
SCSI device
Internal
SCSI device
Controller
External
SCSI device
External
SCSI device
External
SCSI
cable
Internal SCSI cable
Terminate
Internal
SCSI device
Internal
SCSI device
Controller
Internal SCSI cable
Terminate
Figure 3. SCSI bus termination