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

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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)

Image 41

Contents Barracuda 2LP Contents Electrostatic discharge protection PrefaceImportant safety information and precautions Page Barracuda 2LP Installation Guide, Rev. E Wichtige Sicherheitshinweise Barracuda 2LP Installation Guide, Rev. E Page Barracuda 2LP Installation Guide, Rev. E Page CompuServe Forum SeaFAX USA 408 438-2620 EnglandSeaBOARD SeaFONE 408SeaTDD 408 Location Modem number General description Characteristics ST31250 ST32550 Barracuda 2LP Installation Guide, Rev. E Amps Barracuda 2LP Installation Guide, Rev. E Barracuda 2LP Installation Guide, Rev. E General information Drive modelsScsi ID jumpers Scsi bus termination Drive terminationSynchronizing spindles Terminator powerProviding adequate cooling Kühlung des Systems Suggested air flow Abbildung 3. Empfohlener Luftstromverlauf Mounting the drive and connecting cables Installation des Laufwerkes und Anschluß der Kabel Barracuda 2LP Installation Guide, Rev. E DC power connector Abbildung 4. Gleichstromanschluß Hinweis Formatting the drive Enabling write cache Setting the Scsi ID Setting the Scsi ID jumpersTerminating the drive Terminating the driveSetting terminator power jumpers Spindle sync connectors Several other jumper options are available as illustrated Other applicable jumper optionsWD drives Terminating the drive ST32550W shown Term. power to Scsi bus default Scsi I/O Other option jumpers are available as illustrated below Scsi ID = WC/DC drives Option jumpers are available as illustrated below Applicable jumper optionsPin J4 Pin 1 front view of J4 Page Page