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Barracuda 2LP Installation Guide, Rev. E
Terminating the drive
ST31250W and ST32550W drives are terminated with
permanently mounted IC active terminators. If you install
one of these drives and it is not on the end of the SCSI
bus, disable the terminators by removing the jumper from
pins 5 and 6 of connector J1. If you install the drive on the
end of the SCSI bus, enable termination by installing a
jumper on pins 5 and 6 of connector J1 (see Figure 11).
Note. Use active terminators when terminating the bus.
ST31250WD and ST32550WD drives do not have inter-
nal terminators or any other way of adding internal
termination to the drive. You must provide external active
termination (ANSI SCSI-2 Alternative 2) to these drives
when termination is required.
Figure 11. Terminating the drive (ST32550W shown)
W/WD drives
J1
Pin 1
J2
Pin 1
Pin 1
J1
Pin 2
Enable SCSI
terminator (default)
Disable SCSI
terminator
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