Seagate ST12450W/WD

ST12450W/WD Installation Guide, Rev. B 21

ST12450W (single-ended) drives are terminated with

permanently mounted active IC terminators. If you install

an ST12450W drive and it is not on the end of the

SCSI bus, remove the jumper from pins 11 and 12 of

connector J4 (see Figure 4). This disables the termina-

tors on the drive. If you install an ST12450W drive on the

end of the SCSI bus, ensure that a jumper is installed on

pins 11 and 12 of connector J4.

Note. Use active t erminators when terminating the bus.

ST12450WD (differential) drives do not have internal

terminators or any other way of adding internal termina-

tion to the drive. You must provide external termination

to these drives when termination is required.

Power

Connector

Pin 1

J4 J01

Enable drive terminators.*

J4 Pin 1

Disable drive terminators.

* Valid for single-ended drives only.

Drive Termination Options

Figure 4. Terminating ST12450W drives