seagate ST118273 Installation guide [en, de]

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Barracuda 18

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Disc Drive

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ST118273N/W/WD/LW/WC/LC

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Installation Guide

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Contents

Preface.........................................................................................1

Electrostatic discharge protection................................................1

Important safety information and precautions....... .. .....................2

Wichti g e Si c h er h e its h in w ei se ....... ... ...................... .. .. ........ .. ... .....4

Regulatory agency compl iance......... .......... ................... .. ............7

Seagate technical support services.............................................9

General description....................................................................15

Initial se tup inform a t io n........................... .. ... ....... ... .. ....... ... .. ......21

Kühlung des Systems ................................................................32

Installa tion des Laufwerk es

und Anschluß der Kabel..........................................................34

N drives section .........................................................................41

W/WD/LW drives section ...........................................................45

WC/LC d r ive s se c tion ......... ... .. ............... .. ... ....... ... .. ....... ... .. ......51

©1997, 1998 Seagate Technology, Inc. All rights reserved
Publication Number: 77767513, Rev. C
June 19 9 8

Seagate, Seagate Technology, and the Seagate logo are regis-

tered trademarks of Seagate Technology, Inc. Barracuda,
SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either trade­marks or registered trademarks of Seagate Technology, Inc. or
one of its subsidiaries. All other trademarks or registered trade­marks are the property of their respective ow ners.

No part of this publication may be reproduced in any form without
written permission from Seagate Technology, Inc.

Barracuda 18 Installation Guide, Rev. C 1

Preface

This manual contains information for users of the Seagate®
Barracuda 18 SCSI disc driv es . It provi des support services, per­formance specifications, and initial setup information. Additional
information is available in the
(part number 77767512). Contact your Seagate sales represen­tative if you need to order this publication.

Electrostatic discharge protection

Caution.

All drive electronic assemblies are sensitive to static electricity,
due to the electrostatically sensitive devices used within the
drive cir cui try. Although some devices such as metal-oxide semi­conductors are extremely sensitive, all semiconductors, as well
as some resi stors and capacitors, may be damaged or deg raded
by exposure to static electricity.

Electrost atic damage t o electr onic de vices may be caus ed 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 expos ed. 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.

Removal of circuit boards by personnel not perform­ing depot repair will damage components and may
void the war ranty.

Barracuda 18 Product Manual

2 Barracuda 18 Installation Guid e, Rev. C

• Turn off the power before removing or installing the DC power
cable.

• Do not remov e any circuit boards from the drive.

• Never use an ohmmeter on any circuit boards.

• When installing th e drive on a carrier or t ra y, discharge the car­rier or tray pr io r to ins e rtin g it into th e syst e m .

Important safety information and precautions

Caution.

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 oth­ers. The cautions point out condit ions or practices that m ay dam­age the unit, poss ibly making it unsafe for use.

Always observe the foll owing warnings and pre cautions:

• Follow all cautions and warnings in the procedures.

• Use sound safety practices when operating, installing, or
removing the uni t.

• Use caution when troubleshooting a unit that has voltages
present. Turn off power to the unit before removing i t.

• 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 tem­peratures ar e usually highest.

Use forced-air ventilation when bench-testing the
drive to ensur e proper cooling of drive com ponents.

Barracuda 18 Installation Guide, Rev. C 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 repair­able. 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 oper­ated 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 applica­tions of these disc drives include customer packaging and sub­system 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 obtai ning 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 provi sion
for overcurrent protection on drive SELV supply voltages.

This unit is a component part and as such is not meant to com­ply with FCC or similar national requirements as a stand-alone
unit. Engineering radiated emissions test results are available

4 Barracuda 18 Installation Guid e, Rev. C
through the Seagate Safety Department to assist the subsystem

designer.

Wichtige Sicherheitshinweise

Vorsicht.

Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der
Laufwerkkomponenten sicher zustellen.

Verwenden Sie geeignete Sicherheits- um den sicheren, zuver­lässigen 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 gewä hlte Verfa hren weder Ihre
persönliche Sicherheit noch die Leistung der Einheit gefährdet.

Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht­shinweise:

• Beachten Sie alle Warn- und Vorsichtshinweise in diesem

Beim Testen des Laufwerks auf dem Prüftisch ist

Handbuch.

Barracuda 18 Installation Guide, Rev. C 5

• Treffen Sie beim Betrieb, bei der Installation oder bei der
Entfernung der Einheit angemessene Sicherheitsvorkehrun­gen.

• Wenn eine Einheit unter Spannung steht, gehen Sie bei der
Fehlerdiagnose besonders vorsichtig vor. Schalten Sie die
Einheit au s, bevor Sie m it den Installations-und Entfernungsar­beiten beginne n.

• 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 vorgege­benen 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 Protec­tion” angegebenen 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 zustän­digen kann zu einer Beschädigung der Komponenten und
Erlöschen des Garantieanspruchs führ en.

• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus
dem Laufwerk ne hme n! Falls die HDA beschädigt ist, s chicken
Sie das gesamte Laufwerk zur Reparatur ein.

• Die HDA ist nicht vor Ort reparierbar und darf nicht auseinan­dergenommen werden! Öffnen der versiegelten HDA durch
andere Personen als die für die werkseitige Reparatur zustän­digen hat eine Beschädigung der Komponenten und
Erlöschen des Garantieanspruchs zur Folge.

6 Barracuda 18 Installation Guid e, Rev. C
Als Teilkomponente ist diese s Laufwer k für die Ins tallation und

den Betrieb in Übe reinstim mung mit UL 19 50, EN6 0950, C AN/
CSA C22.2 950-95 und VDE0805 vorges ehen.

Seagate ist ständig bemüht, die Zulassungsfähigkeit von
Seagate-P rodukten im Rahme n der gegenw är tig geltend en
Standa rds z u gewäh r leist en. Zu den ty pisch en An wend unge n
dieser Festplattenwerke zählen Systemeinbau durch den
Kunden und die K on strukti on von Unter systemen. Sicherh eitsbe ­hörden gewähren eine bedingte Zulassung für Komponenten wie
das Barracuda-Fest plattenlaufwerk vorbehalt li ch der endgültigen
Zulasssun g im E ndprod ukt. De signer von Unters ysteme n sind
dafür verantwortlich, die Voraussetzungen für die Einhaltung
sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren
Endprodukten und - falls gesetzlich vorgeschrieben - für die
Zulass ung zu sc ha ffen. Eine Gr un dvorau sset zu ng zu r Ei nha l­tung 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 ähn li cher nationaler Behörden
für eigenst ändige Geräte. Technische Testergebnisse zu elektro­magnetische Str ahlung si nd für Design er von Unte rsyst emen auf
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.

Barracuda 18 Installation Guide, Rev. C 7

Regulatory agency compliance

Electromagnetic susceptibility

As a component assembly, the drive is not required to meet any
susceptibility performance re quirements. 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 sys­tem does not adversely affect the performance of the drive. See
Tables 2a, 2b, and 2c, DC power requir em ents.

Electromagnetic compliance

Seagate uses an independent laboratory to confirm compliance
to the directives/standard(s) for CE M arki ng and C-Tick Marking.
The drive was tested in a repre sentative system for typical appli­cations. The selected system represents the most popular char­acteristics for test platf orms. The system configurations include:

• 486, P entium, and P owerPC microprocessors

• 3.5 -inch f lo ppy 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 C­Tick Marking for their product.

8 Barracuda 18 Installation Guid e, Rev. C

Electromagnetic compliance for the European Union

If this model has the CE Marking it complies with the European
Union requirements of the Electromagnetic Compatibility Direc­tive 89/336/EEC of 03 M ay 1989 as amended by Dir ective 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 Austra­lia/New Zealand Standard AS/NZS3548 1995 and meets the
Electromagnetic Compatibility (EMC) Framework requirements
of Australia’s Spectrum Management Agency (SMA).

Barracuda 18 Installation Guide, Rev. C 9

Seagate Techno logy support services

Presales support

To determine which Seagate products are best suited for your
specific application, contact us about configuration and compati­bility and for current product availability. You can leave a voice
message after business hours or send an e-mail message—we
reply during b u siness hours.

Disc Drives 1-877-271-3285 or 405-936-1210

A.M

Fax: [phone]

central time, M-F); e-mail: [email protected]

(8:00

.

to 12:15 P.M., 1:30 P.M. to 6:00

Tape Product s 1-800-626-6637 or 714-641-2500

A.M

Fax: [phone]

e-mail: [email protected]

Note.

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 972-481-4812.

(6:00

.

to 5:00

P.M

.,

pacific time, M-F);

T e c hnical support services

If you need assistance installing your drive, consult your dealer.
Dealers are familiar with their unique system configurations and
can help you with system conflicts and other technical issues. If
you ne ed additional assistance with you r Seagate
Seagate products, use one of the Seagate technical support ser­vices list ed below.

SeaFONE® 1-800-SEAG ATE

Seagate’s 800 number (1-800-732-4283) allows toll-free access
to automated self-help services, providing answers to commonly
asked questions, troubleshooting tips, and specifications for disc

®

drive or other

P.M

.

,

10 Barracuda 18 Inst allation Guide, Rev. C
drives and tape drives. This service is available 24 hours daily

and requires a touch-tone phone. International callers can reach
this automated self-help service by dialing 405-936-1234.

Online services

Using a modem, you can obtain troubleshooting tips, free utility
programs, drive specifications and jumper settings for Seagate’s
entire product line. You can also download software for installing
and analyzing your drive.

SeaNET

You can obtain technical information about Seagate products
over the Inte rne t fro m Se aga te’s World Wi de We b hom e pa ge
(http://www.seagate.com) or Seagate’s ftp server (ftp://
ftp.seagate.com). You can also send e-mail with your questions
to [email protected] or [email protected].

SeaBOARD®

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 st op bit (8-N-1).

Location Phone number

Australia 61-2-9756-2359
France 33 1-48 25 35 95
Germany 49-89-1409331
Taiwan 886-2-2719-6075
Thailand 662-531-8111
UK 44-1628-478011
USA Disc: 405-936-1600; Tape: 405-936-1630

Barracuda 18 Installation Guide, Rev. C 11

FAX services

SeaFAX®

You can use a touch-tone telephone to access Seagate’s auto­mated FAX system to receive technical support information by
return FAX. This service is available 24 hours daily.

Location Phone number

Australia 61-2-9756-5170
Germany 49-89-14305102
UK 44-1628-894084
USA 1-800-SEAGATE or

Disc: 405-936-1620; Tape: 405-936-1640

Technical support FAX

You can FAX questions or comments to technical support spe­cialists 24 hours daily. Responses are sent during business
hours.

Location Phone number

Australia 61-2-9725-4052
France 33 1-46 04 42 50
Germany 49-89-14305100
Hong Kong 852-2368 7173
Japan 81-3-5462-2979
Korea 82-2-556-4251/7395
Singapore 65-488-7528
Taiwan 886-2-2715-2923
UK 44-1628-890660
USA Disc: 405-936-1685; Tape: 405-936-1683

12 Barracuda 18 Inst allation Guide, Rev. C

Direct-support services

Technical support

For one-on-one help, you can talk to a technical support special­ist during local business hours. Before calling, note your system
configuration and drive model number (ST

Location Phone number

Australia 61-2-9725-3366 (9:00

time, M–F)

France 33 1-41 86 10 86 (9:30

Germany 49-89-1409332 (9:30
Hong Kong 852-2368 9918 (9:00

Kore a 82-2-531-5800 (9:00

Singapore 65-488-7584 (9:00
Taiwan 886-2-2514-2237

UK 44-1628-894083 (10: 00

USA Please dial 1-800-SEAGATE or 405-936-1234

P.M

P.M

P.M

P.M

P.M

A.M

.

to 5:00

.

to 4:00

.

to 5:30

.

to 6:00

P.M

.

to 5:00

.

2:00
2:00

2:00

1:00
to 5:00

2:00

for the specific produc t telephone number.
(8:00
centra l time, M–F)

P.M

P.M

P.M

P.M

.

, M–F)

P.M

to 12:15

A.M

P.M

A.M

A.M

.

, M–F)

A.M

.

.

, M–F)

A.M

.

.

, M–F)

A.M

.

to 12:00

.

, M–F)

.

to 12:00

A.M

.

, M–F)

.

, 1:30

xxxx

).

.

to 5:00

.

to 12:30

to 12:30
to 12:00

P.M

.

to 1:00

P.M

P.M

.

, eastern

P.M

P.M

.

P.M

.

P.M

.

,

.

, 2:00

P.M

.

to 6:00

.

,

,
,

P.M

.

.

,

P.M

.

,

SeaTDD™ 405-936-1687

Using a telecommunications device for the deaf (TDD), you can
send questions or comments 24 hours daily and exchange mes-

A.M

sages with a technical support specialist between 8:00

.

to

Barracuda 18 Installation Guide, Rev. C 13

P.M

12:15 P.M. and 1:30 P.M. to 6:00

.

(central time) Monday

through Friday.

Customer service centers

Seagate direct OEM, Distribution, and Systems Integrator cus­tomers should contact their Seagate service representative for
warranty information. Other customers shoul d contact t heir place
of purchase. Seagate offers comprehensive customer support
for all Seagate drives. These services are available worldwide.

Location Phone number FAX number

Asia Pacific and Aus tr alia 65-485-3595 65-488-7503
Middle East and Africa 31-2031-67222 31-2065-34320
Europe 31-2031-67222 31-2065-34320

European to ll-free phone numbers are ava ilable for you to contact
customer service representatives between 8:30
(European central time) Monday through Friday. The European call
center is located in Amsterdam, The Netherlands.

Location Toll-free phone number

Austria 0 800-20 12 90
Belgium 0 800-74 876
Denmark 80 88 12 66
France 0 800-90 90 52
Germany 0 800-182 6831
Ireland 1 800-55 21 22
Italy 1 677 90 695
Netherlands 0 800-732 4283

Location Toll-free phone number

Norway 800-113 91
Poland 00 800-311 12 38
Spain 900-98 31 24
Sweden 0 207 90 073

. and 5:00 P.M.

A.M

14 Barracuda 18 Inst allation Guide, Rev. C

Switzerland 0 800-83 84 11
Turkey 00 800-31 92 91 40
United Kingdom 0 800-783 5177

Location Phone number FAX number

Japan 81-3-5462-2904 81-3-5462-2979
USA 1-800-468-3472 405-949-6740

Other Americas (Braz il ,

Canada, Mexico) 405-949-6706 405-949-6738

Manufacturer’s representatives

Brazil

MA Informatica 55-21-516-6649 55-21-516-5280

Canada

Memofix
Adtech

905-660-4936
905-812-8099

905-660-4951
905-812-7807

1-800-624-9857

Mexico

Abicom Seamax

SA DE CV 525-546-4888 525-546-4888

Southern Europe

Caesar Italia 39-688-18149 39-688-02103

Barracuda 18 Installation Guide, Rev. C 15

General description

Barracuda 18 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 enclosur e desi gned to house one or more di sc driv es
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 emis­sions. The

77767512) contains guidelines for a properly designed

enclosure.

Barracuda 18 Product Manual

(par t nu mber

*

*Model “N” ver si on wit h 50-pin SCSI I/O connector

Figure 1. Barracuda 18 family drive

16 Barracuda 18 Inst allation Guide, Rev. C

Table 1. Driv e ch arac teris tics

Interfac e Ul tra S C S I [1 ]
Capacity

Formatted [2] 18.21 Gbyte [2]
Max. data blocks 21EB38Fh

Recording

Cylinders (user) 7,501
Read/write data heads 20

Access time [3]

Av erage read 7.9 msec
Av erage write 8.7 msec

Disk rotation

RPM 7,2 00 r/ m in
Av erage latency 4.17 msec

Internal transfer rate
(variable with zone) 120–190 Mbits/sec

Maximum synchronous SCSI transfer rate

N model 20 Mbytes/sec
W/WD/WC models 40 Mbytes/sec
L W/ LC 80 Mbytes/sec

[1] Can also be operated according to SCSI-1 and SCSI-2 protocols.

Referred to also as “SCSI Fast-20.”

[2] Sta ndard factor y units ar e forma tted 512 da ta bytes per sect or with

spare tracks reserved for reallocating bad sectors.

[3] Includes controller overhead.

Barracuda 18 Installation Guide, Rev. C 17

T able 2a. DC power requireme nts (Amps)

ST118273N/W/WC

Voltage +5V +12V
Regulation [5] ±5% ±5%[2]
Max. operating current

DC [1] 1.15 1.35
Avg. idle curr e nt

[1] 0.75 0.8

DCX
Max. starting curre nt

(peak DC) [3]
(peak AC) [3]

1.2
—

2.8

4.2

Delayed motor
start (max) [1][4] 0.65 0.06

Peak operating current

Ty pi cal DCX
Maximum DC [1]
Maximum (peak)

[1][6]

1.05

1.15

1.7

1.3

1.35

3.15

Notes for this table follows Table 2c.

18 Barracuda 18 Inst allation Guide, Rev. C

Table 2b. DC power requirements (Amps), different ial (H VD)

ST118273WD

Voltage +5V +12V
Regulation [5] ±5% ±5%[2]
Max. operating current

DC [1] 1.23 1.35
Avg. idle curr e nt

[1] 0.78 0.8

DCX
Max. starting curre nt

(peak DC) [3]
(peak AC) [3]

1.23—2.8

4.2

Delayed motor
start (max) [1][4] 0.67 0.06

Peak operating current

Ty pi cal DCX
Maximum DC [1]
Maximum (peak)

[1][6]

1.16

1.23

2.00

1.3

1.35

3.15

Notes for this table follows Table 2c.

Barracuda 18 Installation Guide, Rev. C 19

Table 2c. DC power requirements (Amps), multimode

(SE/L VD)

ST118273LW/LC

Voltage +5V +12V
Regulation [5] ±5% ±5%[2]
Max. operating current

DC [1] 1.4 1.35
Avg. idle curr e nt

DCX

[1] 0.75 0.8

Max. starting curre nt

(peak DC) [3]
(peak AC) [3]

Delayed motor
start (max) [1][4] 0.65 0.06

Peak operating current

Ty pi cal DCX
Maximum DC [1]
Maximum (peak)

[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 sequen ce has been compl eted and that the driv e is
able to accept selection by the host initiat or.

[3] See the +12V current profile in the

Manual

[4] This conditi on occurs when the Motor Start option is enabled

and the drive has not yet received a Start Motor com mand.

[1][6]

(publication number 77767512).

1.2
—

1.2

1.4

1.7

2.8

4.2

1.3

1.35

3.15

Barracuda 18 Product

20 Barracuda 18 Inst allation Guide, Rev. C
[5] See “Conducted noise immunity” in the

uct Manual.

The specified voltage tolerance is inclusive of

Barracuda 18 Prod-

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 Tables 2a, 2b, and 2c.

1. Minimum current loading for each supply voltage is not less

than 4% of the maximum ope rating 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 require­ments. Wh ere multiple units are powered on simultaneou sly,
be sure the peak starting current is av ailable to each device.

T able 3. Dimensions of the drive

inches mm

Height 1.62 41.1
Width 4.00 101.6
Depth 5.75 146.05
Weight 2.2 pounds (0.99 ki lograms)

Barracuda 18 Installation Guide, Rev. C 21

Initial setup information

The general information beginning on this page applies to all of
the Barracuda 18 drive models. After reading the general infor­mation topics, refer to the appropriate drive-specific section
listed below for additional information about configuring and
installing your particular model.

Drive models Page

ST118273N 41
ST118273W/WD/LW 45
ST118273WC/LC 51

General information

The foll owing general information topics are discussed:

• SCSI ID jumpers

• Drive termination

• Term inator power

• Interf ace drivers and data path width notes

• Other applica ble jumper options

• Providing adequate cooling

• Mounting the drive and connecting cables

• Formatting t he drive

1

This mounting procedure does not apply to “WC” or “LC” model
drives. To mount a “WC” or “LC” drive, plug the drive into the
system’s single connector attachment (SCA) position on the
system’s back panel.

1

22 Barracuda 18 Inst allation Guide, Rev. C

SCSI ID jumper s

Each device on the SCSI chain must have a unique SCSI ID.
The host system’s 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 u sed for ot her 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 user’s manual
for details about its requirements for proper SCSI device
installat io n .

Note.

This drive is a SCAM (SCSI Configured Auto Magically)
compliant drive. I f the system i nto which you are inst all ing
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 i t to have. The system may or may not use the
existing drive ID jumper settings. Setting the drive ID
doesn’t 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 sec­tion for your model.

If, after completing the installation process, the drive’s 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 18 Installation Guide, Rev. C 23
the case, change the ID so that each device on the SCSI chain

has its own unique ID. Also check your system or controller
user’s manual to ensure that you have not violated its SCSI ID
numbering recomm endations.

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 “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 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 externally—this means the SCSI con­troller is no longer on the end of the SCSI chain and should not
be terminated.

Note.

Some controller s prefer to remain terminated even if they
are in the middle of the chai n. Also, some control lers 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.

24 Barracuda 18 Inst allation Guide, Rev. C
For information about how to terminate your drive, refer to the

appropriate drive-specific section.

Internal SCSI cable

Internal

SCSI device

Internal

SCSI device

Internal SCSI cable

Internal

SCSI device

Internal

SCSI device

Terminate

Controller

Terminate

Controller

External

SCSI
cable

External

SCSI device

External

SCSI device

Figure 2. SCSI bus termination

T ermin ator power

You usually will not need to change this option and can normally
leave the drive configured as it was shi pped from the fac tory . For
information about how to change the terminator power option on
your driv e, refer to th e appropriate drive- specific section.

I/O circuits and data path widths

• “WD” models use differential I/O circ uits. You cannot mix th ese
models with single-ended models (“N,” “W,” “WC,” and “LC”)
on the sam e SCSI bus. The circuits are incompatib le with each
other.

• “W,” “WD,” “WC,” and “LW” models h ave a “wide ” (16-bit) SCSI
data bus rather than the standard (non-wide) 8-bit SCSI data
bus; however, you can use these wide drives on a standard
(non-wide) 8-bit data bus.

Barracuda 18 Installation Guide, Rev. C 25
Figures 3a, 3b, 3c, and 3d 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.

Table 4a. Cable characteristics for single-ended I/O

circuits

Maximum distance between

Number of attached SCSI
devices

terminators (meters) [1] [3]
Fast-5 Fast-10 Fast-20 Fast-40

1 to 4 maximum capacit ance
(25 pF) SCS I d evic e s 6 3 3 N/A

5 to 8 maximum capacit ance
(25 pF) SCS I d evic e s 6 3 1.5 N/A

9 to 16 maximum capacitance
(25 pF) SCSI devices 6 3 [2] N/A

[1] F or environments wh ere a ll el ement s of th e b u s (cab l e s, de vi ce i nt er-

faces, environmental noise and other parameters) are controlled to
be better than minim ally requi red, it may be po ssible to exte nd 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 docu­ment. It is recommended that the devices be uniformly spaced
between terminators with the end devices located as close as possi­ble to the terminators.

[3] Values specified by data rate shall apply even if a slower data rate is

negotiated.

26 Barracuda 18 Inst allation Guide, Rev. C

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 25 25 25 [2]

Daisy-chain interconnect
(up to 16 devices) 25 25 25 12 [4]

[1] F or environments wh ere a ll el ement s of th e b u s (cab l e s, de vi ce i nt er-

faces, environmental noise and other parameters) are controlled to
be better than minim ally requi red, it may be po ssible to exte nd 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] Low voltage differential (LVD) devices only (“LW” models).

Twisted pair cable should be used with di fferential transceivers.

Barracuda 18 Installation Guide, Rev. C 27

Figure 3a. Fifty pin I/O connection to drive

Figure 3b. Sixty-eight pin connection to drive

28 Barracuda 18 Inst allation Guide, Rev. C

“N” Model

Drive

SCSI ID X

(or last drive)

[1]

Additional
SCSI devices

Pin 1

(check your

SCSI ID 1

adapter for Pin 1 location)

[2]

SCSI ID 0

SCSI ID 7

Host

Adapter

PCB

[1] “X” means up to 6 or the ma ximum allowable number o f devices on

the SCSI bus. See Table 4a and system documentation.

Figure 3c. Multiple drive connection to host adapter

Barracuda 18 Installation Guide, Rev. C 29

“LW” or

“W” Model

Drive

“WD” Model

Drive [1]

SCSI ID X

(or last drive)

[2]

SCSI ID 1

SCSI ID 0

Additional
SCSI devices

Pin 1

(check your

adapter for Pin 1 location)

[3]

SCSI ID 7

Host

Adapter

PCB

[1] Do not mix “W,” “WD,” and “LW” model drives on the daisy chain.
[2] “X” means up to 15 or the maximum allowable number of devices on

the SCSI bus. See Table 4a and system documentation.

[3] External terminator.

Figure 3d. Multiple-drive connection to host adapter

30 Barracuda 18 Inst allation Guide, Rev. C

Note. This drive model plugs directly into a backplane connec-

tor and therefore uses no cables.

Figure 3e. Drive model “WC” or “LC” with single 80-pin

I/O and power connector

Barracuda 18 Installation Guide, Rev. C 31

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 reliabil­ity, the ambient temperature should be about 15°C below this
value most of t he time.

The drive’s product manual (77767512) describes how to evalu­ate 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 source s.

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.

32 Barracuda 18 Inst allation Guide, Rev. C

Kühl ung des Sy stems

Die Gehäusekonstruktion muß eine ausrei chende Kühlung des
Laufwerkes gewährleisten. Die Umg ebungstemperatur darf m ax­imal 50°C betragen.

Die Produktha ndbuch Barracuda 18 (Dokumen t 77767512)
enthalten Anweisunge n zur Beur teilun g der Luftstr omkonstruk­tion. Die Beurteilung muß sicherstellen, daß sich die Gehäuse­temperatur bestimmter kritischer Komponenten bei
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.

Wir empfehlen, das Laufwerk so zu orientieren oder den Luft­strom so zu l enken, d aß d er ger ingste L uftst romwiders tand
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 zeig t zwe i Konstr ukti onsm öglic hkeite n, bei dene n
ein oder mehrere Lüfter den Luftstrom erzeugen. Der Luftstrom­verlauf wird durch die Lüfter gesteuert, die entweder Luft einbla­sen oder abzie hen . Genere ll kann d er Lu ftstrom entweder von
vorne nach hinten oder von hinten nach vorne verlauf en.

Barracuda 18 Installation Guide, Rev. C 33

.

Above unit

Under unit

Note. Air flows in the direction shown (front to back)
or in reverse direction (back to front)

Note. Air flows in the direction shown or
in reverse direction (side to side)

Figure 4. Suggested air flow
Abbildung 4. Empfohl ener Luftstromverlauf

Above unit

Under unit

34 Barracuda 18 Inst allation Guide, Rev. C

Mounting the drive and connecting cables

Do not touch the connector pins or any components on the con­trol board without observing static-discharge precautions.
Always handle the drive by the frame only.

The drive may be mounted in any orientation (horizontally, verti­cally, and any combination thereof); however, you must ensure
that the drive receives adeq uate air flow f or cool ing.

1. Mount the drive to the host system’ s 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 e venly. Do not over-tighten or force the scr ew if it does
not seem to screw in e asily, because this means the threads
are not properly aligned. In this case, back the screw out
and try again.

Installation des Laufwerkes
und Ansch lu ß der K abel

Beachten Sie bei m Han dhaben 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, ver­tikal oder schräg) installiert werden; jedoch muß dafür gesorgt
werden, daß ein ausreichender Luftstrom zur Kühlung des Lauf­werkes vorhanden ist.

Barracuda 18 Installation Guide, Rev. C 35

1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben

am Gehäuse des Host-Syst ems. 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 G ehäuses dürfen die
Schrauben maximal 3,81 mm in die Befestigungslöcher des
Gehüus es hinei nragen. D ie Schra uben mü ssen gl eich­mäßig, 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 Schrau be nich t in da s Gewi ndeloch
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 inst all ed jumpers.

3. Stellen Sie sicher, daß die Kenn ungsbrücken installiert sind .

4. Connect the SCSI cable into the drive’s SCSI connector.

Take care not to stret ch or crimp this cable, and do not bloc k
the system’s 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

36 Barracuda 18 Inst allation Guide, Rev. C

the DC power connector. To connect the DC power cable to
the drive, simply insert the cable end into the drive’s DC
power connector.

4. Schließen Sie das SCSI-Kabel an den SCSI-Steckverbinder

des Laufwer kes an. Da s Kabel darf nicht ge dehnt oder
gedrückt werden und es darf den Luftstr om zur Kühlung des
Systems nicht behindern.

Das Laufwerk wird über einen 4-poligen, neben dem SCSI­Anschluß befestigten Steckverbinder mit Gleichstrom ver­sorgt. Der Ausgang eines Netzteils muß SELV (safety extra
low voltage) nach IEC 950 entsprechen . Abbildung 5 zeig t
die Steckerbelegung für den Gleichstromanschluß. Zum
Anschlu ß des G leichs tromk abels an das L aufwer k das
Kabelende in den Gleichstromanschluß des Laufwerkes
stecken .

DC Power
Connector

Figure 5. DC power connector
Abbildung 5. Gleichstromanschlu ß

4 3 2 1

Power

Cable

Pin

Power

1

+12V

2

+12V ret

3

+ 5V ret

4

+ 5V

Pin

Gleichstrom

1

+12V

2

+12V Rücklei t u ng

3

+ 5V Rückleitun g

4

+ 5V

Barracuda 18 Installation Guide, Rev. C 37
Note. Signal ground on the power control board (PCB) and the

head and disc assembly (HDA) are connected 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 PCB without electrically isolating
shock mounts. Maximizing the conductive 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/PCB ground, you must provide a nonconductive
(electricall y isolating) meth od of mounting the drive in the
host system. This may increase radiated emissions and
is the system designer’s responsibility.

Hinweis:

Die Signalerde au f der Str omregelung skar te (PCB) und
der Kopf- und Festp latt enein heit (HDA) si nd in di esem
Laufwerk miteinander verbunden und können nicht
getrennt werden. Das Gerät, in das Sie das Laufwerk
eingebaut haben, ist ohne elektrisch isolierende
Stoßdämpfer direkt an di e HDA und PCB angeschlossen.
Die elektromagnetische Strahlung kann reduziert wer­den, indem Sie eine möglichst große leitende Kontak­fläche zwischen der HDA-Erdung und der Systemerdung
vorsehen.

Wenn Sie das Systemgehäuse nicht an die HDA/PCB­Erdung anschließen wollen, müssen Sie das Laufwerk
auf nichtleitende Weise (galvanisch isoliert) im Host-Sys­tem einba uen. Die da raus u.U. resultie ren de vers tärkt e

38 Barracuda 18 Inst allation Guide, Rev. C

elektromagnetische Strahlung fällt in den Zuständigkeits­bereich des Syste md esigners.

5. Replace the host system’s cover.

5. Setzen Sie das Gehäuseoberteil des Host-Systems wieder

auf.

Barracuda 18 Installation Guide, Rev. C 39

C

[3]

G

[1]
E

B

J

K

[2]

M [6]

J2

[6] N

H

S [8]

J6 LED

P [5]

R

A

[4] L

D

F

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 “A” dimension
by 0.040 in. (1.02 mm).

[4]

Centerline of pad for Pin 1 of power connector.

[5]

Centerline of pad for Pin 1 of J6.

[6]

Centerline of pad for Pin 1 of J2. Dimensions indicated are for
reference only.

[7]

Dimensions to Pin 1 of each connector are nominal values.

[8]

To pin ends on J6. Pin ends on J6 are nominally flush with end of drive.

Dimension Table

Inches

A

5.75

B

4.00

C

1.620

D

2.362

E

1.120

F

4.000

G

.250

H

1.750

J

3.750

K

1.625

L

.143

M

.753

N

.165

P

.405

R

2.265

S

2.350

Millimeters

146.05

± .025

101.60

± .015

41.1

+ .027

– .21

60.00

± .010

28.45

± .020

101.60

± .010

6.35

+ .010
– .005

44.45

± .010

95.25

± .010

41.28

± .020

3.63

19.13

4.19

[7] [7]

10.29

52.53

59.69

Figure 6. Mounting configuration dimensions

± .64
± .38

+ .69

– .53

± .25
± .51
± .25

+ .25
– .12

± .25
± .25
± .51

40 Barracuda 18 Inst allation Guide, Rev. C

Formatting the drive

Warning.

Note.

1. Turn on DC power.

2. Boot the system from a system floppy disc or from a previ-

3. Format the disc drive. Barracuda 18 disc drives are

Quick reference desktop system notes
Note.

• DOS. Set the drive type in CMOS to “

hard drive instal led

tems that have operating system Windows 95 release 950B or
later do not need to partition t he drive.

• Macintosh. Use a third-party drive utility (Apple’s HD Setup
utility only works with drives having special Apple firmware).

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.

Seagate is not responsible for lost user data.

ously installed hard disc drive if there is one.

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.

Refer to your system or utility manual for detailed instruc­tions)

Zero,” “None,”

.” Use FDISK.EXE and FORMAT.EXE. Sys-

or “

No

Barracuda 18 Installation Guide, Rev. C 41

N drives

N/ND drives sectionSetting the SCSI ID jumpers

Use the J6 connector to set the SCSI ID (see Figure 7). To
change the SCSI ID, install jumpers on the appropriate pins as
shown in the illustration.

Drive

Front

Jumper Plug

(enlarged to
show detail)

Pin 1

J6

L

R

Reserved

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

Figure 7. Setting the SCSI ID on model N drives

R

E

E

E

A2A1A

D

S

0

S

42 Barracuda 18 Inst allation Guide, Rev. C

N drives

Te rminating th e drive

“N” model 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
ure 8). If you install the drive on the end of the SCSI bus, enable
termination b y installi ng a jumper on pi ns 15 and 16 of connector
J2.

“TE”

from pins 15 and 16 of connector J2 (see Fig-

J2

T

DSMEWPP

E

D

R

ESTPT

Pin 1

P

Enable SCSI terminator (default)
Disable SCSI terminator

J6

Drive

J2 Jumper Plug

(enlarged to
show detail)

Front

Figure 8. Terminating the drive

J2

Barracuda 18 Installation Guide, Rev. C 43

N drives

T ermin ator power

There are four possible terminator power (TP) configurations for
“N” model drives (see Figure 9). You will not normally need to
change this option and can leave the drive configured as it was
shipped from the factory.

D

R
ESTPT

Pin 1

P

J2

“N” model drives

TEDSMEWPP

Term. Power from Drive (default)
Term. Power to SCSI Bus
Drive furnishes power both to its

own terminators and to SCSI bus
Term. Power from SCSI Bus

Position A

J2

J2 Jumper Plug

(enlarged to
show detail)

J6

Drive
Front

Figure 9. Setting terminator power jumpers

44 Barracuda 18 Inst allation Guide, Rev. C

N drives

Other appli cabl e jump e r op tions

Sev eral other jumper opt ions are available as illu strated.

Drive with
HDA up, PCB
down, viewed

from front

Reserved

Reserved
Remote

LED

Shipped with cover installed.

Do not remove.

Do not install jumpers

on these four positions.

Drive Front

DC Power
Connector

SCSI I/O

Connector

Pin 1

HDA

L

R

R

E

E

E

A2A1A

D

S

S

11

12

J6

J2

J1

J2 Jumper Type

(enlarged to
show detail)

J6

0

CATH

Jumper Type

(enlarged to
show detail)

Pin 1

End

Pin 1

J6

Reserved
Delay Motor Start option

(valid only if the Enable
Motor Start jumper is
not connected)

Disable the Delay Motor
Start option.

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.

Motor Start option
Disable motor start.

The drive starts
according to the
Delay Motor Start option.

Enable motor start. The
drive waits for the Start
Unit command from the
host before starting the
spindle motor.

Write Protect option
Write protect = Off

(enables writing).
Write protect = On

(disables writing).
Parity Check option

Enable parity check of
SCSI bus.

Disable parity check.

Figure 10. Additi onal jumper options

J2

Pin 1

(default)

(default)

(default)

(default)

Barracuda 18 Installation Guide, Rev. C 45

W/WD/LW dri ves

W/WD drives sectionSetting the SCSI ID jumpers

Use the J6 jumper block to set the SCSI ID (Figure 11). 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 12).

Drive
Front

Jumper Plug

(enlarged to
show detail)

A2A1A

3

Pin 1

0

[1]

J6

R

L

Reserved

E

E

A

S

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

D

Figure 11. Setting the SCSI ID on model W/WD drives

46 Barracuda 18 Inst allation Guide, Rev. C

W/WD/LW drives

68 Pin SCSI I/O

Connector

J1
SCSI ID = 0
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

not used

Host Alternate
Usage Plug

+5V

Dashed area is optional host circuitry (external to the
drive) connected to host supplied optional usage plug.

Pin 1

+5V

N.C.

Ground

Drive Activity LED

+5V

Ground

A

3A2A1

1197531

12 10 8 6 4 2

J5

Pin 1

4P 3P2P 1P

(default)

For ID selection use
jumpers as shown or
connect a cable for
remote switching as
shown below.

A

0

A0A1A2A

3

Drive

PCB

HDA
Rear

J1-DC Power

Pins 1, 3, 5, and 7 are
optional connections to
switching circuits in host
equipment to establish
drive ID.

Remote Switches

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.

Figure 12. Using J5 connector for model “W,” “WD, ” and

“LW” drive alternate ID select and LED
connection

Barracuda 18 Installation Guide, Rev. C 47

W drives

Te rminating th e drive

“W” model 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
install the drive on the end of the SCSI bus, enable termination
by installing a jumper on pins 15 and 16 of connector J2 (see
Figure 13).

Note.

“WD” and “LW” model drives do not have internal terminators or
any other way of adding internal termination to the drive. You
must provide external differential termination to these drives
when termination is required.

“TE”

from pins 15 and 16 of connector J2. If you

Use active (ANSI SCSI- 2 Alt ernative 2) terminators when
terminating the bus.

J2

T

DSMEWPP

[1]
*Enable SCSI terminator (default)
*Disable SCSI terminator

*“W” model only

Drive

J2 Jumper Plug

(enlarged to
show detail)

Front

E

J6

J2

Pin 1

R
ESTPT

D

P

[1] The “TE” jumper is not applicable to “WD” and “LW” drives .

Figure 13. Terminating the drive (“W” model shown)

48 Barracuda 18 Inst allation Guide, Rev. C

W/WD drives

T ermin ator power

There are four possible terminator power (TP) configurations for
“W” model drives (see Figure 14). You will not normally need to
change this option and can leave the drive configured as it was
shipped from the factory.

There are two possible terminator power (TP) configurations for
“WD” model drives (see Figure 14).

D

D

R
ESTPT

R

R

E

EST

S

Pin 1

P

P

J2

“W” model drives

TEDSMEWPP

Term. Power from Drive (default)
Term. Power to SCSI Bus
Drive furnishes power both to its

own terminators and to SCSI bus
Term. Power from SCSI Bus

Position A

R

WPDSMEP

E

“WD” model drives

S

Term. Power to SCSI Bus (default)
Host adapter or other device provides

term. power to external terminator.

J2

J2 Jumper Plug

(enlarged to
show detail)

J6

Drive
Front

Figure 14. Setting terminator power jumpers

Barracuda 18 Installation Guide, Rev. C 49

W/WD/LW dri ves

Other appli cabl e jump e r op tions

Other option jumpers are available as illustrated in Figures 15
and 16.

Drive with
HDA up, PCB
down, viewed

from front

Reserved

Reserved
Remote

LED

Shipped with cover installed.

Do not remove.

Do not install jumpers

on these four positions.

Drive Front

DC Power
Connector

SCSI I/O

Connector

HDA

L

R

E

E

A2A3A1A

D

S

11

12

J6

J2

J1

J2 Jumper Type

(enlarged to
show detail)

Pin 1

0

Pin 1

End

Pin 1

J6

CATH

J6

Jumper Type

(enlarged to
show detail)

Reserved
Delay Motor Start option

(valid only if the Enable
Motor Start jumper is
not connected)

Disable the Delay Motor
Start option.

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.

Motor Start option
Disable motor start

(default). The drive
starts according to the
Delay Motor Start option.

Enable motor start. The
drive waits for the Start
Unit command from the
host before starting the
spindle motor.

Write Protect option
Write protect = Off

(enables writing.
Write protect = On

(disables writing).
Parity Check option

Enable parity check of
SCSI bus.

Disable parity check.

[1] See Figure 16 for this jumper position option for “LW” drives.

Figure 15. Additional jumper options for “W,” “WD,” and

“LW ” drives

J2

[1]

Pin 1

(default)

(default)

(default)

(default)

50 Barracuda 18 Inst allation Guide, Rev. C

LW drives

J2

SEDSMEWPP

D

Pin 1

R

R

E

EST

S

P

A jumper here forces single-ended
I/O operation.

No jumper allows host to select either
single-ended or LVD operation.

(default)

Term. Power to SCSI Bus (default)
Host adapter or other device provides

term. power to external terminator.

J2

J2 Jumper Plug

(enlarged to
show detail)

J6

Drive
Front

Figure 16. Additional jumper option for “LW” drives

Barracuda 18 Installation Guide, Rev. C 51

WC/LC drives

WC/DC drives sectionSetting the SCSI ID jumpers

The SCSI ID for “WC” and “LC” model 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.

Te rminating th e drive

“WC” and “LC” model drives do not have internal terminators or
any other way of adding internal termination to the drive. Exter­nal termination for these drives must be supplied by the host
equipment.

52 Barracuda 18 Inst allation Guide, Rev. C

W
W

W

T
m
o

T
m
o

WC drives

Applicable jumper options

Option available for all models are selected by jumpers as illus­trated in Figures 17 through 19.

J2

R

Delay Motor Start option

he host system has complete control over

otor start functions. Do not install a jumper

n these pins.

Enable Motor Start option

he host system has complete control over

otor start functions. Do not install a jumper

n these pins.

rite Protect option
rite protect = Off (enables writing)

rite protect = On (disables writing)

Parity Check option
Enable parity check of SCSI bus.

Disable parity check.

ESDSMEWPP

D

Pin 1

R

R

R

E

E

E

S

S

S

(default

(default

J6

Drive

J2 Jumper Plug

(enlarged to
show detail)

Front

Figur e 17. Jumper op t i ons for “W C ” drives

J2

Barracuda 18 Installation Guide, Rev. C 53

LC drives

J2

Delay Motor Start option
The host system has complete control over

motor start functions. Do not install a jumper
on these pins.

Enable Motor Start option
The host system has complete control over

motor start functions. Do not install a jumper
on these pins.

Write Protect option
Write protect = Off (enables writing)

Write protect = On (disables writing)
Parity Check option

Enable parity check of SCSI bus.
Disable parity check.

J6

Drive

J2 Jumper Plug

(enlarged to
show detail)

Front

SEDSMEWPP

J2

Pin 1

R

R

R

E

E

E

D

S

S

S

(default)

(default)

(default)

(default)

Figure 18. Jumper options for “LC” drives

54 Barracuda 18 Inst allation Guide, Rev. C

LC drives

Single-Ended I/O

J2

SEDSMEWPP

R

R

R

E

E

E

D

S

S

S

A jumper here forces single-ended I/O

operation.

No jumper allows host to select either

single-ended or LVD operation.

J6

Drive

J2 Jumper Plug

(enlarged to
show detail)

Front

J2

(default)

Figure 19. Additi onal jumper option for “LC” drives

Pin 1

Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA

Publica ti on Number: 77767513, Rev. C, Printed in USA