Seagate ST32550W/WD/WC/DC, ST31250W/WD/WC/DC, ST31250N/ND Terminating the drive ST32550W shown

Barracuda 2LP Installation Guide, Rev. E 39

Terminating the drive

W/WD drives

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.

J1 Pin 1

Pin 1 J2

Pin 1

J1

Pin 2

Enable SCSI terminator (default)

Disable SCSI terminator

Figure 11. Terminating the drive (ST32550W shown)