Seagate ST12550N/ND/W/WD, ST11950N/ND/W/WD manual Terminating the drive, Scsi bus termination

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ST11950 and ST12550 Installation Guide, Rev. D 23

Terminating the drive

If you are installing the drive in a system that has other SCSI devices installed, terminate only the end devices on the SCSI chain. A SCSI “device” is any disc drive, scanner, tape backup unit, or other piece of hardware connected to your system using the SCSI bus.

The top example in Figure 5 shows an internal hard disc at one end of the SCSI bus with the SCSI controller at the other end (both are terminated). The bottom example shows two additional SCSI devices connected exter- nally—this means the SCSI controller is no longer on the end of the SCSI chain and should not be terminated.

Internal SCSI cable

 

 

 

 

 

 

 

 

Internal

 

Internal

 

Controller

SCSI device

 

SCSI device

 

 

 

 

 

 

 

 

 

 

 

 

 

Terminate

Internal SCSI cable

 

 

 

 

 

 

 

 

Internal

 

Internal

 

Controller

SCSI device

 

SCSI device

 

 

 

 

 

 

 

 

 

 

 

 

 

External

SCSI cable

External

SCSI device

External

SCSI device

Terminate

Figure 5. SCSI bus termination

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Contents Barracuda 1 Disc Drive ST11950N/ND/W/WD ST12550N/ND/W/WD Contents Electrostatic discharge protection ST11950 and ST12550 Installation Guide, Rev. DImportant safety information and precautions Page ST11950 and ST12550 Installation Guide, Rev. D Wichtige Sicherheitshinweise Page Page Page Page SeaFAX USA 408 438-2620 England 10 ST11950 and ST12550 Installation Guide, Rev. DSeaFONE 408 SeaTDD 408Telephone SeaBOARDLocation Number General description 12 ST11950 and ST12550 Installation Guide, Rev. DBarracuda 1 and 2 disc drive N/ND type Characteristics ST11950N/ND ST11950W/WD 14 ST11950 and ST12550 Installation Guide, Rev. DCharacteristics ST12550N/ND ST12550W/WD Amps 16 ST11950 and ST12550 Installation Guide, Rev. DST11950 and ST12550 Installation Guide, Rev. D From previous 18 ST11950 and ST12550 Installation Guide, Rev. DInitial setup information Setting the Scsi ID jumpers 20 ST11950 and ST12550 Installation Guide, Rev. DSetting the Scsi ID on N- and ND-type drives Setting the Scsi ID on W- and WD-type drives 22 ST11950 and ST12550 Installation Guide, Rev. DScsi bus termination Terminating the driveST11950N and ST12550N drives Installing terminator packs ST11950N shownST11950W and ST12550W drives Enabling termination On ST11950W and ST12550W drives 26 ST11950 and ST12550 Installation Guide, Rev. DTermination is supplied Terminator powerChanging other applicable jumper options 28 ST11950 and ST12550 Installation Guide, Rev. DScsi Scsi I/O 30 ST11950 and ST12550 Installation Guide, Rev. DRES PAR DMS RES MTR WP Synchronizing spindles 32 ST11950 and ST12550 Installation Guide, Rev. DJ5 Pin ST11950N/ND ST12550N/ND Drives 34 ST11950 and ST12550 Installation Guide, Rev. DProviding adequate cooling Kühlung des Systems 36 ST11950 and ST12550 Installation Guide, Rev. DAbove unit Über der Einheit Under unit Unter der Einheit Mounting the drive and connecting cables 38 ST11950 and ST12550 Installation Guide, Rev. DInstallation des Laufwerkes und Anschluß der Kabel Dimensions Abbildung 15. Laufwerkabmessungen 40 ST11950 and ST12550 Installation Guide, Rev. DPage DC power connector Abbildung 16. Gleichstromanschluß Hinweis Page Formatting the drive