Seagate ST31250W/WD/WC/DC, ST32550W/WD/WC/DC, ST31250N/ND, ST32550N/ND manual Terminating the drive

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34Barracuda 2LP Installation Guide, Rev. E

N/ND drives

Terminating the drive

ST31250N and ST32550N 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 (see Figure 6). 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.

Note. Use active terminators when terminating the bus.

ST31250ND and ST32550ND drives do not have internal terminators or any other way of adding internal termina- tion to the drive. You must provide external active termi- nation (ANSI SCSI-2 Alternative 2) to these drives when termination is required.

	J1
Pin 6	Pin 1
	Pin 1
	Pin 1

J1

Pin 6

J2

Pin 1

Pin 2

Enable SCSI terminator (default)

Disable SCSI terminator

Figure 6. Terminating the drive

Image 36

Contents Barracuda 2LP Contents Preface Electrostatic discharge protectionImportant 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 SeaFAX USA 408 438-2620 England CompuServe ForumSeaFONE 408 SeaTDD 408SeaBOARD 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 Drive models General informationScsi ID jumpers Drive termination Scsi bus terminationTerminator power Synchronizing spindlesProviding 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 jumpers Setting the Scsi IDTerminating the drive Terminating the driveSetting terminator power jumpers Spindle sync connectors Other applicable jumper options Several other jumper options are available as illustratedWD 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 Applicable jumper options Option jumpers are available as illustrated belowPin J4 Pin 1 front view of J4 Page Page