Seagate BARRACUDA ST11950N/ND/W/WD - Manual (Page 25)

ST11950 and ST12550 Installation Guide, Rev. D 23
Terminating the drive
If you are installing the 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 5 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 5. SCSI bus termination