Seagate BARRACUDA2 - Manual (Page 24)

22 ST12450W/WD Installation Guide, Rev. B
Terminator power
ST12450W drives may be configured in four different
ways (see Figure 5); however, you usually will not need
to change this option and should normally leave the
drive configured as it was shipped from the factory.
ST12450WD drives should be configured with a jumper
connecting J01 pins 1 and 3 (and no jumper on J01 pins
2 and 4) as illustrated in Figure 5.
Figure 5. Setting terminator power jumpers
Pin 1
Term. power from drive.
Term. power from SCSI bus.
Term. power to SCSI bus.
Term. power to SCSI bus and drive.
J01
Pin 1
Pin 2
Pin 3
*
*
*
* Valid for single-ended drives only.
Power
Connector
J4 J01