Seagate Computer Monitor ST136475LW LC User Guide

Barracuda 36  
Disc Drive  
ST136475LW/LC  
Installation Guide  
 
Barracuda 36 Installation Guide, Rev. B  
1
Preface  
This manual contains information for users of the Seagate®  
Barracuda 36 SCSI disc drives. It provides support services, per-  
formance specifications, and initial setup information. Additional  
information is available in the Barracuda 36 Product Manual  
(part number 77767528). Contact your Seagate sales represen-  
tative if you need to order this publication.  
Electrostatic discharge protection  
Caution. Removal of circuit boards by personnel not perform-  
ing depot repair will damage components and may  
void the warranty.  
All drive electronic assemblies are sensitive to static electricity,  
due to the electrostatically sensitive devices used within the  
drive circuitry. Although some devices such as metal-oxide semi-  
conductors are extremely sensitive, all semiconductors, as well  
as some resistors and capacitors, may be damaged or degraded  
by exposure to static electricity.  
Electrostatic damage to electronic devices may be caused by the  
direct discharge of a charged conductor or by exposure to the  
static fields surrounding charged objects. To avoid damaging  
drive electronic assemblies, observe the following precautions  
when installing or servicing the drive:  
Ground yourself to the drive whenever the drive electronics  
are or will be exposed. Connect yourself to ground with a wrist  
strap (Seagate part number 12263496). Connection may be  
made to any grounded metal assembly. As a general rule,  
remember that you and the drive electronics must all be  
grounded to avoid potentially damaging static discharges.  
 
   
2
Barracuda 36 Installation Guide, Rev. B  
Turn off the power before removing or installing the DC power  
cable.  
Do not remove any circuit boards from the drive.  
Never use an ohmmeter on any circuit boards.  
When installing the drive on a carrier or tray, discharge the car-  
rier or tray prior to inserting it into the system.  
Important safety information and precautions  
Caution.  
Use forced-air ventilation when bench-testing the  
drive to ensure proper cooling of drive components.  
Use proper safety techniques for safe, reliable operation of this  
unit.  
The procedures in this manual and labels on the unit contain  
warnings and cautions that must be carefully read and followed  
to minimize or eliminate the risk of personal injury. The warnings  
point out conditions or practices that may endanger you or oth-  
ers. The cautions point out conditions or practices that may dam-  
age the unit, possibly making it unsafe for use.  
Always observe the following warnings and precautions:  
Follow all cautions and warnings in the procedures.  
Use sound safety practices when operating, installing, or  
removing the unit.  
Use caution when troubleshooting a unit that has voltages  
present. Turn off power to the unit before removing it.  
Ensure that the internal temperature of the rack or cabinet  
does not exceed the limits defined for the drive when the drive  
is mounted in an equipment rack or cabinet. When units are  
stacked vertically, pay special attention to the top where tem-  
peratures are usually highest.  
 
 
Barracuda 36 Installation Guide, Rev. B  
3
Follow the precautions listed above in Electrostatic discharge  
protection.”  
Do not remove any circuit boards from the drive. Return the  
entire drive for depot repair if any circuit board is defective.  
Removal of circuit boards by personnel not performing depot  
repair will damage components and may void the warranty.  
Do not remove the head and disc assembly (HDA) from the  
drive. Return the entire drive for depot repair if the HDA is  
defective.  
Do not attempt to disassemble the HDA. It is not field repair-  
able. If the sealed HDA is opened by personnel not performing  
depot repair, this will damage components and void the  
warranty.  
As a component, this drive is designed to be installed and oper-  
ated in accordance with UL1950, EN60950, CAN/CSA C22.2  
950-95, and VDE0805.  
Seagate takes all reasonable steps to ensure that its products  
are certifiable to currently accepted standards. Typical applica-  
tions of these disc drives include customer packaging and sub-  
system design. Safety agencies conditionally certify component  
assemblies, such as the Barracuda disc drive, based on their  
final acceptability in the end-use product. The subsystem  
designers are responsible for meeting these conditions of  
acceptability in obtaining safety-regulatory agency compliance in  
their end-use products and for certifying where required by law.  
A necessary part of meeting safety requirements is the provision  
for overcurrent protection on drive SELV supply voltages.  
This unit is a component part and as such is not meant to com-  
ply with FCC or similar national requirements as a stand-alone  
unit. Engineering radiated emissions test results are available  
 
4
Barracuda 36 Installation Guide, Rev. B  
through the Seagate Safety Department to assist the subsystem  
designer.  
Wichtige Sicherheitshinweise  
Vorsicht.  
Beim Testen des Laufwerks auf dem Prüftisch ist  
Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der  
Laufwerkkomponenten sicherzustellen.  
Verwenden Sie geeignete Sicherheits- um den sicheren, zuver-  
lässigen Betrieb dieser Einheit zu gewährleisten.  
Die Verfahren in diesem Handbuch und die Aufkleber auf dem  
Gerät enthalten Warn- und Vorsichtshinweise. Diese Hinweise  
sind sorgfältig durchzulesen und zu beachten, um das Risiko  
von Verletzungen auf ein Mindestmaß zu beschränken oder  
ganz zu vermeiden. Die Warnhinweise machen auf Situationen  
oder Praktiken aufmerksam, die Sie oder andere gefährden  
könnten. Die Vorsichtshinweise machen auf Situationen oder  
Praktiken aufmerksam, die Einheit beschädigen können, so daß  
deren Gebrauch mit Risiko behaftet ist.  
Die Warn- und Vorsichtshinweise sind nicht allumfassend! Es ist  
uns einfach nicht möglich, alle Wartungsmethoden oder die  
eventuellen Risiken jeder Methode zu kennen, zu beurteilen und  
Sie entsprechend zu beraten. Aus diesem Grund haben wir auf  
eine derartige umfassende Beurteilung verzichtet. Falls Sie ein  
hier nicht beschriebenes Verfahren oder Werkzeug verwenden,  
stellen Sie zuerst sicher, daß das gewählte Verfahren weder Ihre  
persönliche Sicherheit noch die Leistung der Einheit gefährdet.  
Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht-  
shinweise:  
Beachten Sie alle Warn- und Vorsichtshinweise in diesem  
Handbuch.  
 
 
Barracuda 36 Installation Guide, Rev. B  
5
Treffen Sie beim Betrieb, bei der Installation oder bei der  
Entfernung der Einheit angemessene Sicherheitsvorkehrun-  
gen.  
Wenn eine Einheit unter Spannung steht, gehen Sie bei der  
Fehlerdiagnose besonders vorsichtig vor. Schalten Sie die  
Einheit aus, bevor Sie mit den Installations-und Entfernungsar-  
beiten beginnen.  
Wenn das Laufwerk in einem Einbaugestell oder Gehäuse  
montiert ist, sorgen Sie dafür, daß die Temperatur im Inneren  
des Gestells oder Gehäuses die für das Laufwerk vorgege-  
benen Grenzwerte nicht übersteigt. Wenn Einheiten vertikal  
übereinander betestigt werden, achten Sie besonders auf den  
oberen Stapelbereich, da dort die Temperatur gewöhnlich am  
höchsten ist.  
Befolgen Sie die oben unter Electrostatic Discharge Protec-  
tionangegebenen Sicherheitsmaßnahmen.  
Nehmen Sie keine Platinen aus dem Laufwerk. Wenn eine  
Platine defekt ist, muß das gesamte Laufwerk zur Reparatur  
eingeschickt werden. Die Herausnahme von Platinen durch  
andere Personen als die für die werkseitige Reparatur zustän-  
digen kann zu einer Beschädigung der Komponenten und  
Erlöschen des Garantieanspruchs führen.  
Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus  
dem Laufwerk nehmen! Falls die HDA beschädigt ist, schicken  
Sie das gesamte Laufwerk zur Reparatur ein.  
Die HDA ist nicht vor Ort reparierbar und darf nicht auseinan-  
dergenommen werden! Öffnen der versiegelten HDA durch  
andere Personen als die für die werkseitige Reparatur zustän-  
digen hat eine Beschädigung der Komponenten und  
Erlöschen des Garantieanspruchs zur Folge.  
 
6
Barracuda 36 Installation Guide, Rev. B  
Als Teilkomponente ist dieses Laufwerk für die Installation und  
den Betrieb in Übereinstimmung mit UL 1950, EN60950, CAN/  
CSA C22.2 950-95 und VDE0805 vorgesehen.  
Seagate ist ständig bemüht, die Zulassungsfähigkeit von  
Seagate-Produkten im Rahmen der gegenwärtig geltenden  
Standards zu gewährleisten. Zu den typischen Anwendungen  
dieser Festplattenwerke zählen Systemeinbau durch den  
Kunden und die Konstruktion von Untersystemen. Sicherheitsbe-  
hörden gewähren eine bedingte Zulassung für Komponenten wie  
das Barracuda-Festplattenlaufwerk vorbehaltlich der endgültigen  
Zulasssung im Endprodukt. Designer von Untersystemen sind  
dafür verantwortlich, die Voraussetzungen für die Einhaltung  
sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren  
Endprodukten und - falls gesetzlich vorgeschrieben - für die  
Zulassung zu schaffen. Eine Grundvoraussetzung zur Einhal-  
tung der Sicherheitsanforderungen ist die Bereitstellung eines  
Überlastschutzes für die SELV-Versorgungsspannungen des  
Laufwerks.  
Dieses Gerät ist eine Baugruppe und unterliegt als solche nicht  
den Anforderungen der FCC oder ähnlicher nationaler Behörden  
für eigenständige Geräte. Technische Testergebnisse zu elektro-  
magnetische Strahlung sind für Designer von Untersystemen auf  
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.  
 
Barracuda 36 Installation Guide, Rev. B  
7
Regulatory agency compliance  
Electromagnetic susceptibility  
As a component assembly, the drive is not required to meet any  
susceptibility performance requirements. It is the responsibility of  
those integrating the drive within their systems to perform those  
tests required and design their system to ensure that equipment  
operating in the same system as the drive or external to the sys-  
tem does not adversely affect the performance of the drive. See  
Table 2, DC power requirements.  
Electromagnetic compliance  
Seagate uses an independent laboratory to confirm compliance  
to the directives/standard(s) for CE Marking and C-Tick Marking.  
The drive was tested in a representative system for typical appli-  
cations. The selected system represents the most popular char-  
acteristics for test platforms. The system configurations include:  
486, Pentium, and PowerPC microprocessors  
3.5-inch floppy disc drive  
Keyboard  
Monitor/display  
Printer  
External modem  
Mouse  
Although the test system with this Seagate model complies to  
the directives/standard(s), we cannot guarantee that all systems  
will comply. The computer manufacturer or system integrator  
shall confirm EMC compliance and provide CE Marking and  
C-Tick Marking for their product.  
 
 
8
Barracuda 36 Installation Guide, Rev. B  
Electromagnetic compliance for the European Union  
If this model has the CE Marking it complies with the European  
Union requirements of the Electromagnetic Compatibility Direc-  
tive 89/336/EEC of 03 May 1989 as amended by Directive 92/31/  
EEC of 28 April 1992 and Directive 93/68/EEC of 22 July 1993.  
Australian C-Tick  
If this model has the C-Tick Marking it complies with the Austra-  
lia/New Zealand Standard AS/NZS3548 1995 and meets the  
Electromagnetic Compatibility (EMC) Framework requirements  
of Australias Spectrum Management Agency (SMA).  
 
Barracuda 36 Installation Guide, Rev. B  
9
Seagate Technology support services  
Online Services  
Internet  
For online information about Seagate products, visit  
Presales Support:  
email_presales.shtml or [email protected]  
email_tape_presales.shtml or  
Technical Support:  
email_disc_support.shtml or [email protected]  
email_tape_support.shtml or Ta[email protected]  
®
SeaBOARD  
is a computer bulletin board system that contains  
information about Seagate disc and tape drive products and is  
available 24 hours daily. Set your communications software to  
eight data bits, no parity and one stop bit (8-N-1). This service is  
available worldwide.  
Automated Services  
SeaFONE® (1-800-SEAGATE)  
is Seagate's toll-free number (1-  
800-732-4283) to access our automated self-help services.  
Using a touch-tone phone, you can find answers to service  
phone numbers, commonly asked questions, troubleshooting  
 
 
10  
Barracuda 36 Installation Guide, Rev. B  
tips and specifications for disc drives and tape drives 24 hours  
daily. International callers can reach this service by dialing +1-  
405-936-1234.  
®
SeaFAX is Seagate's automated FAX delivery system. Using a  
touch-tone phone, you can obtain technical support information  
by return FAX 24 hours daily. This service is available worldwide.  
Presales Support  
Our Presales Support staff can help you determine which  
Seagate products are best suited for your specific application or  
computer system.  
Seagate Express  
You can purchase select tape products and tape accessories  
through Seagate Express 24 hours daily by calling 1-800-531-  
0968 or by faxing your order to: +1-972-481-4812.  
Technical Support  
If you need help installing your drive, consult your dealer. Deal-  
ers are familiar with their unique system configurations and can  
help you with system conflicts and other technical issues. If you  
need additional help, you can talk to a Seagate technical support  
specialist. Before calling, note your system configuration and  
drive model number (ST####).  
SeaTDD(+1-405-936-1687) is a telecommunications device  
for the deaf (TDD). You can send questions or comments 24  
hours daily and exchange messages with a technical support  
specialist from 8:00 A.M. to 12:15 P.M. and 1:30 P.M. to 6:00  
P.M. (central time) Monday through Friday.  
 
Barracuda 36 Installation Guide, Rev. B  
11  
Customer Service (CSO)  
Warranty Repair  
Seagate offers worldwide customer support for Seagate drives.  
Seagate direct OEM, Distribution and System Integrator custom-  
ers should contact their Seagate service center representative  
for warranty information. Other customers should contact their  
place of purchase.  
Authorized Service Centers  
If you live outside the US, you can contact an Authorized Service  
Center for service or repair.  
USA/Canada/Latin America Support Services  
Presales Support  
Disc: 1-877-271-3285 or  
+1-405-936-1210  
FAX: +1-405-936-1683  
Tape: 1-800-626-6637 or  
+1-714-641-2500  
FAX: +1-714-641-2410  
Technical Support (SeaFONE)  
1-800-SEAGATE or +1-405-936-1234 (for specific product  
phone number)  
FAX: Disc: +1-405-936-1685; Tape: +1-405-936-1683  
SeaFAX  
1-800-SEAGATE  
SeaTDD  
+1-405-936-1687  
SeaBOARD  
Disc: +1-405-936-1600; Tape: +1-405-936-1630  
 
12  
Barracuda 36 Installation Guide, Rev. B  
Warranty Repair  
USA  
1-800-468-3472  
FAX: +1-405-949-6740  
FAX: +1-405-949-6738  
Mexico and  
Latin America  
+1-405-949-7758  
Authorized Service Centers  
Brazil  
MA Informatica +55-21-516-6649  
FAX: +55-21-516-5280  
FAX: +1-905-660-4951  
Canada  
Memofix  
Adtech  
1
+1-905-660-4936  
+1-905-812-8099 or FAX: +1-905-812-7807  
1-800-624-9857  
1
European Support Services  
For European customer support, dial the toll-free number for  
your specific country for presales support, technical support,  
SeaFAX and warranty repair.  
If your country is not listed here, dial our European call center at  
+31-20-316-7222 from 8:30 A.M. to 5:00 P.M. (European central  
time) Monday through Friday. The European call center is  
located in Amsterdam, The Netherlands.  
Call Center  
Austria  
0 800-20 12 90  
0 800-74 876  
80 88 12 66  
0 800-90 90 52  
0 800-182 6831  
1 800-55 21 22  
Belgium  
Denmark  
France  
Germany  
Ireland  
1Authorized Service Centers  
 
 
Barracuda 36 Installation Guide, Rev. B  
13  
Italy  
1 677 90 695  
Netherlands  
Norway  
Poland  
0 800-732 4283  
800-113 91  
00 800-311 12 38  
900-98 31 24  
Spain  
Sweden  
Switzerland  
Turkey  
0 207 90 073  
0 800-83 84 11  
00 800-31 92 91 40  
United Kingdom 0 800-783 5177  
SeaBOARD  
Germany  
+49-89-1409331  
Fax ServicesAll European Countries  
Presales/Technical Support/Warranty Repair +31-20-653-3513  
Africa/Middle East Support Services  
For presales, technical support, warranty repair and FAX ser-  
vices in Africa and the Middle East, dial our European call center  
at +31-20-316-7222 from 8:30 a.m. to 5:00 p.m. (European cen-  
tral time) Monday through Friday, or send a FAX to +31-20-653-  
3513. The European call center is located in Amsterdam, The  
Netherlands.  
Asia/Pacific East Support Services  
Technical Support  
Australia  
Hong Kong  
Japan  
Singapore  
Taiwan  
+61-2-9725-3366 FAX: +61-2-9725-4052  
+852-2368 9918  
+65-488-7584  
FAX: +852-2368 7173  
FAX: +81-3-5462-2979  
FAX: +65-488-7528  
+886-2-2514-2237 FAX: +886-2-2715-2923  
 
14  
Barracuda 36 Installation Guide, Rev. B  
SeaFAX  
Australia  
+61-2-9756-5170  
Warranty Repair  
Japan  
+81-3-5462-2904 FAX: +81-3-5462-2979  
Asia/Pacific and +65-485-3595  
Australia  
FAX: +65-488-7503  
 
Barracuda 36 Installation Guide, Rev. B  
15  
General description  
Barracuda 36 SCSI disc drives are high-speed, random-access  
digital-data storage devices.  
The drive is a component for installation in an enclosure  
designed for the drive. This is often a rack within the system or  
an external enclosure designed to house one or more disc drives  
or other peripheral units. In either case, the disc drive must  
receive adequate cooling (refer to Providing adequate cooling)  
and it must be sufficiently grounded and shielded from emis-  
sions. The Barracuda 36 Product Manual (part number  
77767528) contains guidelines for a properly designed  
enclosure.  
*
*Model LWversion with 68-pin SCSI I/O connector  
Figure 1. Barracuda 36 family drive  
 
 
16  
Barracuda 36 Installation Guide, Rev. B  
Drive characteristics  
Table 1.  
Interface  
Capacity  
UltraSCSI [1]  
Formatted [2]  
Max. data blocks  
36 Gbyte [2]  
71132960  
Recording  
Cylinders (user)  
11,721  
Read/write data heads 20  
Access time [3]  
Average read  
Average write  
7.6 msec  
8.4 msec  
Disk rotation  
RPM  
Average latency  
7,200 r/min  
4.17 msec  
Internal transfer rate  
(variable with zone)  
137240 Mbits/sec  
Maximum synchronous SCSI transfer rate  
LW/LC 80 Mbytes/sec  
[1] Can also be operated according to SCSI-2 and SCSI-3 protocols.  
Referred to also as SCSI Fast-80.”  
[2] Standard factory units are formatted 512 data bytes per sector with  
spare tracks reserved for reallocating bad sectors.  
[3] Includes controller overhead.  
 
     
Barracuda 36 Installation Guide, Rev. B  
17  
Table 2.  
DC power requirements (Amps), multimode  
(SE/LVD)  
ST136475LW/LC  
Voltage  
+5V  
+12V  
Regulation [5]  
±5%  
±5%[2]  
Max. operating current  
DC [1]  
1.4  
1.5  
0.8  
Avg. idle current  
DCX [1]  
0.75  
Max. starting current  
(peak DC) [3]  
(peak AC) [3]  
1.05  
2.8  
4.2  
Delayed motor  
start (max) [1][4]  
0.65  
0.030  
Peak operating current  
Typical DCX [1][6]  
Maximum DC [1]  
1.05  
1.4  
1.3  
1.5  
Maximum (peak)  
1.7  
3.15  
[1] Measured with an average reading DC ammeter. Instanta-  
neous +12V current peaks will exceed these values.  
[2] A 10% droop is permissible during initial start of the spindle  
but must return to ±5% before reaching 7,200 RPM. The  
±5% must be maintained after the drive signifies that its  
power-up sequence has been completed and that the drive is  
able to accept selection by the host initiator.  
[3] See the +12V current profile in the Barracuda 36 Product  
Manual (publication number 77767528).  
[4] This condition occurs when the Motor Start option is enabled  
and the drive has not yet received a Start Motor command.  
 
       
18  
Barracuda 36 Installation Guide, Rev. B  
[5] See Conducted noise immunityin the Barracuda 36 Prod-  
uct Manual. The specified voltage tolerance is inclusive of  
ripple, noise, and transient response.  
[6] Operating condition is defined as random seek read opera-  
tions with a block count of 64.  
General Notes from Table 2.  
1. Minimum current loading for each supply voltage is not less  
than 4% of the maximum operating current shown.  
2. Use separate ground returns for +5V and +12V supplies.  
3. Where power is provided to multiple drives from a common  
supply, carefully consider individual drive power require-  
ments. Where multiple units are powered on simultaneously,  
be sure the peak starting current is available to each device.  
Table 3 shows the nominal dimensions and weight of the drive.  
Table 3.  
Dimensions of the drive  
inches  
mm  
Height 1.62  
Width 4.00  
Depth 5.75  
41.1  
101.6  
146.05  
Weight 2.2 pounds (0.99 kilograms)  
 
     
Barracuda 36 Installation Guide, Rev. B  
19  
Initial setup information  
The general information beginning on this page applies to all of  
the Barracuda 36 drive models. After reading the general infor-  
mation topics, refer to the appropriate drive-specific section  
listed below for additional information about configuring and  
installing your particular model.  
Drive models  
Page  
ST136475LW  
39  
ST136475LC  
44  
General information  
The following general information topics are discussed:  
SCSI ID jumpers  
Drive termination  
Terminator power  
Interface drivers and data path width notes  
Other applicable jumper options  
Providing adequate cooling  
Mounting the drive and connecting cables1  
Formatting the drive  
1This mounting procedure does not apply to LCmodel drives.  
To mount an LCdrive, plug the drive into the systems single  
connector attachment (SCA) position on the systems back  
panel.  
 
 
20  
Barracuda 36 Installation Guide, Rev. B  
SCSI ID jumpers  
Each device on the SCSI chain must have a unique SCSI ID.  
The host systems SCSI controller usually uses the ID that has  
the highest priority interrupt in the SCSI I/O system. This is  
always ID7. ID0 is lowest priority in an 8-bit I/O system. ID8 is  
lowest priority in a 16-bit I/O system. The lower priority SCSI IDs  
are normally used for other SCSI devices such as this Barracuda  
disc drive.  
Note.  
Most SCSI controllers (host adapters) allow you to skip a  
SCSI ID. For example, you can have ID0, ID1, and ID3  
(skipping ID2). Other controllers do not allow this so be  
sure to refer to your system or controller users manual  
for details about its requirements for proper SCSI device  
installation.  
Note.  
This drive is a SCAM (SCSI Configured Auto Magically)  
compliant drive. If the system into which you are installing  
this drive requires SCAM compliant drives, you do not  
need to be concerned about the drive ID jumper settings,  
as the system automatically assigns your new drive the  
ID it wants it to have. The system may or may not use the  
existing drive ID jumper settings. Setting the drive ID  
doesnt hurt anything, but is not necessary in a SCAM  
compliant system.  
Most Barracuda disc drives are factory set with the SCSI ID set  
at 0. To change the SCSI ID, refer to the appropriate drive sec-  
tion for your model.  
If, after completing the installation process, the drives LED does  
not show on/off activity when the host is trying to communicate  
with the drive, a duplicate SCSI ID may be the problem. If this is  
 
Barracuda 36 Installation Guide, Rev. B  
21  
the case, change the ID so that each device on the SCSI chain  
has its own unique ID. Also check your system or controller  
users manual to ensure that you have not violated its SCSI ID  
numbering recommendations.  
Drive termination  
If you are installing a Barracuda drive in a system that has other  
SCSI devices installed, terminate only the end devices on the  
SCSI chain. A SCSI deviceis any disc drive, scanner, tape  
backup unit, or other piece of hardware connected to your sys-  
tem using the SCSI bus.  
The top example in Figure 2 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 externallythis means the SCSI con-  
troller is no longer on the end of the SCSI chain and should not  
be terminated.  
Note.  
Some controllers prefer to remain terminated even if they  
are in the middle of the chain. Also, some controllers treat  
the internal and external chains as separate logical  
buses. This means you may need to terminate both the  
first and last devices on both logical buses to achieve  
proper termination. If necessary, refer to your system or  
controller documentation to see how this is handled in  
your particular system.  
 
22  
Barracuda 36 Installation Guide, Rev. B  
For information about how to terminate your drive, refer to the  
appropriate drive-specific section.  
Internal SCSI cable  
Internal  
Internal  
Controller  
SCSI device SCSI device  
Terminate  
Internal SCSI cable  
External  
SCSI  
cable  
Internal  
Internal  
SCSI device SCSI device  
External  
External  
Controller  
SCSI device SCSI device  
Terminate  
Figure 2. SCSI bus termination  
Terminator power  
You usually will not need to change this option and can normally  
leave the drive configured as it was shipped from the factory. For  
information about how to change the terminator power option on  
your drive, refer to the appropriate drive-specific section.  
I/O circuits and data path widths  
• “LWand LCmodels use SCSI multimode I/O circuits. Multi-  
mode circuits operate either in single-ended mode or low volt-  
age differential mode. No high voltage differential devices  
should be connected in the I/O daisy chain with LWor LC”  
model drives. The state of the I/O DIFFSNSline determines  
whether the devices on the SCSI bus operate their I/O circuits  
in single-ended or low voltage differential mode. The host  
device on the SCSI bus operates the DIFFSNSline. How-  
ever, the SE jumper on J2 forces DIFFSNSto nominal  
 
 
Barracuda 36 Installation Guide, Rev. B  
23  
ground (see Figure 12). The host device cannot override the  
SE jumper. If DIFFSNSis at nominal ground (0V to .6V), all  
of the bus receivers/drivers operate in single-ended mode. If  
DIFFSNSis between .7V and 1.9V, all bus receiver/drivers  
operate in low voltage differential (LVD) mode.  
• “LCand LWmodels have a wide(16-bit) SCSI data bus  
rather than the standard (non-wide) 8-bit SCSI data bus; how-  
ever, you can use these wide drives on a standard (non-wide)  
8-bit data bus. However, the unused lines must be terminated  
the same as the used lines.  
Figures 3a and 3b show typical drive connections. The following  
tables list the maximum cable lengths and number of devices  
allowed on a daisy-chain cable for I/O data transfer rates shown.  
Note. For LVD operation, twisted pair cables are recom-  
mended. For LVD Fast-40 operation, twisted pair cables  
are strongly recommended. For Fast-80 operation,  
twisted pair cables are required.  
 
24  
Barracuda 36 Installation Guide, Rev. B  
Table 4a. Cable characteristics for single-ended I/O  
circuits  
Maximum distance between  
terminators (meters) [1] [3]  
Number of attached SCSI  
devices  
Fast-5 Fast-10 Fast-20 Fast-40  
1 to 4 maximum capacitance  
(25 pF) SCSI devices  
6
6
6
3
3
3
3
N/A  
N/A  
N/A  
5 to 8 maximum capacitance  
(25 pF) SCSI devices  
1.5  
[2]  
9 to 16 maximum capacitance  
(25 pF) SCSI devices  
[1] For environments where all elements of the bus (cables, device inter-  
faces, environmental noise and other parameters) are controlled to  
be better than minimally required, it may be possible to extend the  
path length and device count.  
[2] Extending the device count beyond eight requires specification con-  
trol beyond the minimum specified in the ANSI T10/1142D docu-  
ment. It is recommended that the devices be uniformly spaced  
between terminators with the end devices located as close as possi-  
ble to the terminators.  
[3] Values specified by data rate shall apply even if a slower data rate is  
negotiated.  
 
     
Barracuda 36 Installation Guide, Rev. B  
25  
Table 4b. Cable characteristics for differential I/O circuits  
Maximum distance between  
terminators (meters) [1] [3]  
Interconnect  
Fast-5 Fast-10 Fast-20 Fast-40  
Point-to-point interconnect  
(2 devices)  
25  
15  
25  
15  
25  
15  
25 [2]  
12  
Daisy-chain interconnect  
(up to 16 devices) [4]  
[1] For environments where all elements of the bus (cables, device inter-  
faces, environmental noise and other parameters) are controlled to  
be better than minimally required, it may be possible to extend the  
path length and device count.  
[2] SCSI devices shall be within a stub length of the termination (.1  
meter).  
[3] Values specified by data rate shall apply even if a slower data rate is  
negotiated.  
[4] Loads spaced at least eight inches (20.3 cm) apart (cables). (Refer  
to SCSI EPI T10/1143D specification.)  
 
       
26  
Barracuda 36 Installation Guide, Rev. B  
Figure 3a. Sixty-eight pin connection to drive  
 
 
Barracuda 36 Installation Guide, Rev. B  
27  
LWModel  
Drive  
Note. Do not mix drives operating  
single-ended with drives  
operating differential on the  
daisy chain.  
[3]  
SCSI ID X  
(or last drive)  
[4]  
Additional  
SCSI devices  
Pin 1  
(check your  
adapter for Pin 1 location)  
SCSI ID 1  
SCSI ID 7  
[1]  
Host  
Adapter  
PCBA  
SCSI ID 0  
[3]  
[2]  
[1] Closed end type 68 pin connector used. Terminator required.  
[2] Open end type (in-line application) connector used. No terminator.  
[3] Host need not be on the end of the daisy chain. Another device can  
be on the end with the terminator, the host having no terminator.  
[4] Total interface cable length must not exceed that specified in ANSI  
Standard X3T10/1142D (including host adapter/initiator). The cable  
length restriction limits the total number of devices allowed.  
[5] SCSI ID7 has highest arbitration priority. For LWmodels, priority is  
ID7 to ID0, then ID15 to ID8 (ID 8 very lowest).  
[6] Last drive on the daisy chain.  
Figure 3b. Multiple-drive connection to host adapter  
 
 
28  
Barracuda 36 Installation Guide, Rev. B  
Note. This drive model plugs directly into a backplane connec-  
tor and therefore uses no cables.  
Figure 3c. Drive model LCwith single 80-pin I/O and  
power connector  
 
Barracuda 36 Installation Guide, Rev. B  
29  
Providing adequate cooling  
The enclosure design must ensure adequate cooling for the  
drive. The maximum ambient air temperature around the drive  
should not exceed 50°C. However, to achieve maximum reliabil-  
ity, the ambient temperature should be about 15°C below this  
value most of the time.  
The drives product manual (77767528) describes how to evalu-  
ate the air-flow design. The evaluation consists of ensuring that  
the case temperature of certain critical components remains  
within acceptable limits during drive operation.  
We recommend orienting the drive or directing the air flow in a  
way that creates the least amount of air-flow resistance while  
providing air flow above the circuit boards and around the head  
and disc assembly (HDA). Also, choose the shortest possible  
path between the air inlet and exit. This minimizes the distance  
traveled by air that is heated by the drive and by other nearby  
heat sources.  
Figure 4 shows two design approaches with one or more fans  
used to generate air flow. The air-flow patterns can be created  
by the fans either pushing or drawing air. The overall flow pattern  
can be directed from front to back, back to front, or side to side.  
 
30  
Barracuda 36 Installation Guide, Rev. B  
Kühlung des Systems  
Die Gehäusekonstruktion muß eine ausreichende Kühlung des  
Laufwerkes gewährleisten. Die Umgebungstemperatur darf max-  
imal 50°C betragen.  
Die Produkthandbuch Barracuda 36 (Dokument 77767528)  
enthalten Anweisungen zur Beurteilung der Luftstromkonstruk-  
tion. Die Beurteilung muß sicherstellen, daß sich die Gehäuse-  
temperatur bestimmter kritischer Komponenten bei  
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.  
Wir empfehlen, das Laufwerk so zu orientieren oder den Luft-  
strom so zu lenken, daß der geringste Luftstromwiderstand  
erzeugt wird und gleichzeitig ein Luftstrom über den Platinen  
und um die Kopf- und Festplatteneinheit (HDA) gegeben ist.  
Wählen Sie einen möglichst kurzen Weg zwischen Lufteinlaß  
und -auslaß. Dadurch wird die Strecke, die die vom Laufwerk  
und anderen nahegelegenen Hitzequellen aufgewärmte Luft  
zurücklegt, auf ein Minimum beschränkt.  
Abbildung 4 zeigt zwei Konstruktionsmöglichkeiten, bei denen  
ein oder mehrere Lüfter den Luftstrom erzeugen. Der Luftstrom-  
verlauf wird durch die Lüfter gesteuert, die entweder Luft einbla-  
sen oder abziehen. Generell kann der Luftstrom entweder von  
vorne nach hinten oder von hinten nach vorne verlaufen.  
 
 
Barracuda 36 Installation Guide, Rev. B  
31  
.
Above unit  
Under unit  
Note. Air flows in the direction shown (front to back)  
or in reverse direction (back to front)  
Above unit  
Under unit  
Note. Air flows in the direction shown or  
in reverse direction (side to side)  
Figure 4. Suggested air flow  
Abbildung 4. Empfohlener Luftstromverlauf  
 
 
32  
Barracuda 36 Installation Guide, Rev. B  
Mounting the drive and connecting cables  
Do not touch the connector pins or any components on the con-  
trol board without observing static-discharge precautions.  
Always handle the drive by the frame only.  
The drive may be mounted in any orientation (horizontally, verti-  
cally, and any combination thereof); however, you must ensure  
that the drive receives adequate air flow for cooling.  
1. Mount the drive to the host systems chassis using four 6-32  
UNC screws. Two mounting holes are in each side of the  
drive and there are four mounting holes in the bottom of the  
drive.  
The maximum length that the screws should extend into the  
chassis mounting holes is 0.15 inch (3.81 mm), measured  
from the outer surface of the chassis. Tighten the screws  
down evenly. Do not over-tighten or force the screw if it does  
not seem to screw in easily, because this means the threads  
are not properly aligned. In this case, back the screw out  
and try again.  
Installation des Laufwerkes  
und Anschluß der Kabel  
Beachten Sie beim Handhaben und Anfassen der Anschlußstifte  
und Komponenten die Vorsichtsmaßnahmen zur Verhinderung  
statischer Aufladung. Fassen Sie das Laufwerk nur am Rahmen  
an.  
Das Laufwerk kann in beliebiger Orientierung (horizontal, ver-  
tikal oder schräg) installiert werden; jedoch muß dafür gesorgt  
werden, daß ein ausreichender Luftstrom zur Kühlung des Lauf-  
werkes vorhanden ist.  
 
 
Barracuda 36 Installation Guide, Rev. B  
33  
1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben  
am Gehäuse des Host-Systems. Die beiden Seiten des  
Laufwerkes sind mit jeweils zwei Befestigungslöchern  
versehen, die Unterseite des Laufwerkes weist vier weitere  
Befestigungslöcher auf.  
Gemessen von der Außenfläche des Gehäuses dürfen die  
Schrauben maximal 3,81 mm in die Befestigungslöcher des  
Gehüuses hineinragen. Die Schrauben müssen gleich-  
mäßig, jedoch nicht zu fest, angezogen werden. Wenn sich  
eine Schraube nicht ohne Widerstand einschrauben läßt,  
sind die Gewinde nicht korrekt aneinander ausgerichtet. In  
diesem Fall die Schraube nicht in das Gewindeloch  
forcieren, sondern die Schraube herausnehmen und erneut  
in das Gewindeloch einführen.  
2. Verify that all connections between the drive and the host  
system are correctly installed.  
2. Prüfen Sie, ob alle Verbindungen zwischen dem Laufwerk  
und dem Host-System korrekt hergestellt sind.  
3. Verify that you have correctly installed jumpers.  
3. Stellen Sie sicher, daß die Kennungsbrücken installiert sind.  
4. Connect the SCSI cable into the drives SCSI connector.  
Take care not to stretch or crimp this cable, and do not block  
the systems cooling air flow with the cable.  
The drive receives DC power through a 4-pin connector  
mounted next to the SCSI connector. The output of a power  
supply must meet SELV (safety extra low voltage) as  
defined in IEC 950. Figure 5 provides the pin information for  
 
34  
Barracuda 36 Installation Guide, Rev. B  
the DC power connector. To connect the DC power cable to  
the drive, simply insert the cable end into the drives DC  
power connector.  
4. Schließen Sie das SCSI-Kabel an den SCSI-Steckverbinder  
des Laufwerkes an. Das Kabel darf nicht gedehnt oder  
gedrückt werden und es darf den Luftstrom zur Kühlung des  
Systems nicht behindern.  
Das Laufwerk wird über einen 4-poligen, neben dem SCSI-  
Anschluß befestigten Steckverbinder mit Gleichstrom ver-  
sorgt. Der Ausgang eines Netzteils muß SELV (safety extra  
low voltage) nach IEC 950 entsprechen. Abbildung 5 zeigt  
die Steckerbelegung für den Gleichstromanschluß. Zum  
Anschluß des Gleichstromkabels an das Laufwerk das  
Kabelende in den Gleichstromanschluß des Laufwerkes  
stecken.  
J1  
Pin 1  
J5  
Pin 1  
DC Power  
4P 3P 2P 1P  
PCBA  
Pin Power  
1
2
3
4
+12V  
+12V ret  
+
+
5V ret  
5V  
Pin Gleichstrom  
1
2
3
4
+12V  
+12V Rückleitung  
+
+
5V Rückleitung  
5V  
Power  
Cable  
Figure 5. DC power connector  
Abbildung 5. Gleichstromanschluß  
 
 
Barracuda 36 Installation Guide, Rev. B  
35  
Note. Signal ground on the printed circuit board assembly  
(PCBA) and the head and disc assembly (HDA) are con-  
nected together in this drive and you cannot separate  
them. The equipment in which you have mounted the  
drive is connected directly to the HDA and PCBA without  
electrically isolating shock mounts. Maximizing the con-  
ductive contact area between HDA ground and system  
ground may reduce radiated emissions.  
If you do not want the system chassis to be connected to  
the HDA/PCBA ground, you must provide a nonconduc-  
tive (electrically isolating) method of mounting the drive in  
the host system. This may increase radiated emissions  
and is the system designers responsibility.  
Hinweis:  
Die Signalerde auf der bedruckte computerplatine mon-  
tage (PCBA) und der Kopf- und Festplatteneinheit (HDA)  
sind in diesem Laufwerk miteinander verbunden und kön-  
nen nicht getrennt werden. Das Gerät, in das Sie das  
Laufwerk eingebaut haben, ist ohne elektrisch isolier-  
ende Stoßdämpfer direkt an die HDA und PCBA ange-  
schlossen. Die elektromagnetische Strahlung kann  
reduziert werden, indem Sie eine möglichst große lei-  
tende Kontakfläche zwischen der HDA-Erdung und der  
Systemerdung vorsehen.  
Wenn Sie das Systemgehäuse nicht an die HDA/PCBA-  
Erdung anschließen wollen, müssen Sie das Laufwerk  
auf nichtleitende Weise (galvanisch isoliert) im Host-Sys-  
tem einbauen. Die daraus u.U. resultierende verstärkte  
 
36  
Barracuda 36 Installation Guide, Rev. B  
elektromagnetische Strahlung fällt in den Zuständigkeits-  
bereich des Systemdesigners.  
5. Replace the host systems cover.  
5. Setzen Sie das Gehäuseoberteil des Host-Systems wieder  
auf.  
 
Barracuda 36 Installation Guide, Rev. B  
37  
C
[3]  
G
[1]  
D
E
F
A
Notes:  
[1] Mounting holes three on each side, 6-32 UNC. Max screw length  
into side of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0  
in-lb (.675 NM) max with minimum thread engagement of 0.12 in.  
(3.05 mm).  
[2] Mounting holes four on bottom, 6-32 UNC. Max screw length into  
bottom of drive 0.15 in. (3.81 mm). Screw tightening torque 6.0 in-lb  
(.675 NM) max with minimum thread engagement of 0.12 in. (3.05 mm).  
[3] Power and interface connectors can extend past the Adimension  
by 0.040 in. (1.02 mm).  
B
[4] Centerline of pad for Pin 1 of power connector.  
[5] Centerline of pad for Pin 1 of J6.  
J
[6] Centerline of pad for Pin 1 of J2. Dimensions indicated are for  
reference only.  
[4] L  
[7] Dimensions to Pin 1 of each connector are nominal values.  
K
H
[8] To pin ends on J6. Pin ends on J6 are nominally flush with end of drive.  
[2]  
Dimension Table  
Inches  
Millimeters  
M [6]  
[6] N  
J2  
A
B
C
5.75 ± .025  
146.05 ± .64  
4.00 ± .015  
101.60 ± .38  
1.620  
+
.027  
41.1  
+ .69  
.21  
.53  
D
E
F
2.362 ± .010  
1.120 ± .020  
4.000 ± .010  
.250 + .010  
.005  
60.00 ± .25  
28.45 ± .51  
101.60 ± .25  
6.35 + .25  
.12  
G
S [8]  
H
J
K
L
1.750 ± .010  
3.750 ± .010  
1.625 ± .020  
.143  
44.45 ± .25  
95.25 ± .25  
41.28 ± .51  
3.63  
J6  
LED  
M
N
P
R
S
.753  
.165  
.405  
2.265  
2.350  
19.13  
4.19  
10.29  
52.53  
59.69  
[7]  
[7]  
P [5]  
R
Figure 6. Mounting configuration dimensions  
 
38  
Barracuda 36 Installation Guide, Rev. B  
Formatting the drive  
Warning.  
Formatting a drive erases all user data. Be sure that  
you understand this principle before formatting any  
hard disc drive. It is not necessary to format a drive  
that previously has been used to store data, unless  
your intention is to erase all user data.  
Note.  
Seagate is not responsible for lost user data.  
1. Turn on DC power.  
2. Boot the system from a system floppy disc or from a previ-  
ously installed hard disc drive if there is one.  
3. Format the disc drive. Barracuda 36 disc drives are  
designed to operate with a variety of operating systems.  
Please refer to your system or SCSI controller manual for  
information about formatting and setting up the drive. Some  
quick desktop system notes are provided below.  
Quick reference desktop system notes  
Note.  
Refer to your system or utility manual for detailed instruc-  
tions)  
DOS. Set the drive type in CMOS to Zero,” “None,or No  
hard drive installed.Use FDISK.EXE and FORMAT.EXE. Sys-  
tems that have operating system Windows 95 release 950B or  
later do not need to partition the drive.  
Macintosh. Use a third-party drive utility (Apples HD Setup  
utility only works with drives having special Apple firmware).  
 
Barracuda 36 Installation Guide, Rev. B  
39  
LW drives  
Setting the SCSIWID/WjuDmdpreirvses section  
Use the J6 jumper block to set the SCSI ID (Figure 7). To change  
the SCSI ID, install jumpers on the appropriate pins as shown in  
the illustration. Optional connections to switching circuits in host  
equipment are provided on J1 auxiliary to set the SCSI ID (see  
Figure 8).  
Terminating the drive  
LWmodel drives do not have internal terminators or any other  
way of adding internal termination to the drive. External termina-  
tion for these drives must be supplied by the host equipment.  
 
 
40  
LW drives  
Barracuda 36 Installation Guide, Rev. B  
Drive  
Front  
Jumper Plug  
(enlarged to  
show detail)  
Pin 1  
[1]  
J6  
L
E
D
R
E
S
Reserved  
A
A
A
A
1 0  
3
2
SCSI ID = 0  
(default)  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
Figure 7. Setting the SCSI ID on model LWdrives  
 
 
Barracuda 36 Installation Guide, Rev. B  
41  
LW drives  
68 Pin SCSI I/O  
Connector  
+5V  
Drive  
HDA  
Rear  
J5  
Pin 1  
Ground  
J1-DC Power  
Pin 1  
4P  
(default)  
3P2P  
1P  
J1  
SCSI ID = 0  
PCBA  
SCSI ID = 1  
SCSI ID = 2  
SCSI ID = 3  
SCSI ID = 4  
SCSI ID = 5  
SCSI ID = 6  
SCSI ID = 7  
For ID selection use  
jumpers as shown or  
connect a cable for  
remote switching as  
shown below.  
SCSI ID = 8  
SCSI ID = 9  
SCSI ID = 10  
SCSI ID = 11  
SCSI ID = 12  
SCSI ID = 13  
SCSI ID = 14  
SCSI ID = 15  
not used  
Pins 1, 3, 5, and 7 are  
A
A
A
A
1 0  
3
2
optional connections to  
switching circuits in host  
equipment to establish  
drive ID.  
Host Alternate  
Usage Plug  
11  
9
7
5
6
3
4
1
2
A
A
A
A
3
0
1
2
Remote Switches  
12 10  
8
+5V  
Pins 2, 4, 6, and 8 are normally  
not grounded. They are driven low  
(ground) for 250 ms after a Reset or  
PWR ON to allow drive to read  
SCSI ID selected. Pin 8 may  
also be used to drive the cathode  
of an external Activity LED.  
+5V  
N.C.  
Ground  
Drive Activity LED  
Dashed area is optional host circuitry (external to the  
drive) connected to host supplied optional usage plug.  
Figure 8. Using J5 connector for model LWdrive  
alternate ID select and LED connection  
 
 
42  
LW drives  
Barracuda 36 Installation Guide, Rev. B  
Other applicable jumper options  
Other option jumpers are available as illustrated in Figures 9 and  
10.  
J2  
Drive with  
HDA up, PCB  
down, viewed  
from front  
Pin 1  
[1]  
Pin 1  
HDA  
Low voltage differential  
Delay Motor Start option  
(valid only if the Enable  
Motor Start jumper is  
not connected)  
J6  
L
E
D
R
E
S
Reserved  
A
A
A
A
0
3
2
1
Disable the Delay Motor  
Start option.  
(default)  
Reserved  
Motor start delay equal  
to the SCSI ID multiplied  
by 12 seconds. For  
example, if the SCSI  
ID = 2, the drive starts  
in 24 seconds.  
11  
12  
Remote  
LED  
CATH  
Shipped with cover installed.  
Do not remove.  
Do not install jumpers  
on these four positions.  
Motor Start option  
Disable motor start  
(default). The drive  
starts according to the  
Delay Motor Start option.  
J6  
(default)  
J6  
Drive Front  
Jumper Type  
(enlarged to  
show detail)  
Enable motor start. The  
drive waits for the Start  
Unit command from the  
host before starting the  
spindle motor.  
Pin 1  
End  
Write Protect option  
J2  
Write protect = Off  
(enables writing.  
(default)  
(default)  
Pin 1  
Write protect = On  
(disables writing).  
DC Power  
Connector  
Parity Check option  
J1  
Enable parity check of  
SCSI bus.  
SCSI I/O  
Connector  
J2 Jumper Type  
(enlarged to  
show detail)  
Disable parity check.  
[1] See Figure 10 for this jumper position option for LWdrives.  
Figure 9. Additional jumper options for LWdrives  
 
 
Barracuda 36 Installation Guide, Rev. B  
43  
LW drives  
Pin 1  
J2  
R R  
S D M W P E E T  
E S E P D S S P  
[3]  
A jumper here forces single-ended  
I/O operation. [2]  
No jumper allows host to select either  
single-ended or LVD operation.  
(default)  
(default) [1]  
Term. Power to SCSI Bus  
Host adapter or other device provides  
term. power to external terminator.  
J2  
J6  
Drive  
Front  
J2 Jumper Plug  
(enlarged to  
show detail)  
[1] TPnot used on LCdrives.  
[2] Jumper not to be used for LWoperation.  
[3] Jumper position names shown here are not marked on the PCBA.  
They are shown here for reference only.  
Figure 10. Additional jumper option for LWdrives  
 
 
44  
Barracuda 36 Installation Guide, Rev. B  
LC drives  
Setting the SCSIWIDC/jDumCpderirvses section  
The SCSI ID for LCmodel drives is normally set over the SCSI  
bus by the host system using connector contacts 39 (ID0), 40  
(ID2), 79 (ID1), and 80 (ID3). Users need not install jumpers to  
select SCSI ID.  
Terminating the drive  
LCmodel drives do not have internal terminators or any other  
way of adding internal termination to the drive. External termina-  
tion for these drives must be supplied by the host equipment.  
 
 
Barracuda 36 Installation Guide, Rev. B  
45  
LC drives  
Pin 1  
J2  
R R R  
S D M W P E E E  
[1]  
Delay Motor Start option  
E S E P D S S S  
The host system has complete control over  
motor start functions. Do not install a jumper  
on these pins.  
(default)  
Enable Motor Start option  
The host system has complete control over  
motor start functions. Do not install a jumper  
on these pins.  
(default)  
(default)  
Write Protect option  
Write protect = Off (enables writing)  
Write protect = On (disables writing)  
Parity Check option  
Enable parity check of SCSI bus.  
(default)  
Disable parity check.  
J2  
J6  
Drive  
Front  
J2 Jumper Plug  
(enlarged to  
show detail)  
[1] Jumper position names shown here are not marked on the PCBA.  
They are shown here for reference only.  
Figure 11. Jumper options for LCdrives  
 
46  
Barracuda 36 Installation Guide, Rev. B  
LC drives  
Single-ended/low-voltage-differential selection  
SE  
The  
and all other devices on the SCSI bus to operate in the single-  
SE  
jumper, when installed on J2, forces the drive I/O circuits  
ended (SE) mode. When the  
jumper is not on, the SCSI I/O  
can operate in either single-ended or low-voltage differential  
(LVD) mode, depending on which mode the host device has  
SE  
selected using the DIFFSNSI/O line. The  
jumper should  
not be installed unless the system documentation specifically  
states that it should be installed. The I/O bus can transfer data at  
a much higher data rate in the LVD mode, but the system must  
be designed to accommodate a higher data rate.  
 
Barracuda 36 Installation Guide, Rev. B  
47  
LC drives  
Pin 1  
J2  
R R R  
S D M W P E E E  
E S E P D S S S  
[1]  
Single-Ended I/O  
A jumper here forces single-ended I/O  
operation.  
No jumper allows host to select either  
single-ended or LVD operation.  
(default)  
J2  
J6  
Drive  
Front  
J2 Jumper Plug  
(enlarged to  
show detail)  
[1] Jumper position names shown here are not marked on the PCBA.  
They are shown here for reference only.  
Figure 12. Additional jumper option for LCdrives  
 
 
 
 
Seagate Technology, Inc.  
920 Disc Drive, Scotts Valley, CA 95066-4544, USA  
Publication Number: 77767529, Rev. B, Printed in USA  
 

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