Seagate ST34555N Installation Guide download pdf (Page 22)

20 Hawk 4XL Installation Guide, Rev. A

the case, change the ID so that each device on the SCSI chain

has its own unique ID. Also check your system or controller

user’s manual to ensure that you have not violated its SCSI ID

numbering recommendations.

Drive termination

If you are installing a Hawk 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 2 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 externally—this means the SCSI con-

troller is no longer on the end of the SCSI chain and should not

be terminated.

Note.

Some controllers prefer to remain terminated even if they

are in the middle of the chain. Also, some controllers treat

the internal and external chains as separate logical

buses. This means you may need to terminate both the

first and last devices on both logical buses to achieve

proper termination. If necessary, refer to your system or

controller documentation to see how this is handled in

your particular system.

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Seagate ST34555N Installation Guide Page 22