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40 Barracuda 2LP Installation Guide, Rev. E
W/WD drives
Terminator power
There are four possible terminator power configurations
for ST31250W and ST32550W drives (see Figure 12).
You will not normally need to change this option and can
leave the drive configured as it was shipped from the
factory.
ST31250WD and ST32550WD drives should be config-
ured with a jumper connecting J1 pins 1 and 3 (and no
jumper on J1 pins 2 and 4) as illustrated in Figure 12.
Figure 12. Setting terminator power jumpers
ST31250W and ST32550W
J1 Connector
ST31250WD and
ST32550WD
J1 Connector
J1
Pin 4
Pin 3
Pin 2
Pin 1
Term. power from drive (default)
J1
Pin 1
Pin 2Pin 6
ST31250WD and ST32550WD
ST31250W and ST32550W
Term. power to SCSI bus (default)
Term. power to SCSI bus
Term. power from SCSI bus
Term. power to SCSI bus
and drive
Pin 4
Pin 3
Pin 1
Pin 2
Pin 1
Pin 6