seagate ST32171FC, ST34371FC, ST34571FC Installation guide

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Barracuda 4LP FC

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Fibre Channel

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Disc Drive

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ST32171FC, ST34371FC,

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ST34571FC

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Installation Guide

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Contents

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

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

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

Wichtige Sicherheitshinweise...................................................... 4

Seagate technical support services.............................................8

General description...................................................................13

Installing the Barracuda 4LP FC drive....................................... 15

Kühlung des Systems................................................................16

Troubleshooting......................................................................... 26

©1997 Seagate Technology, Inc. All rights reserved
Publication Number: 77767495, Rev. A
April 1997

Seagate, S eagate Technology, and the Seagate logo are regis­tered trademarks of Seagate Technology, Inc. Barracuda,
SeaFAX, SeaFONE, SeaNET, SeaTDD, and SeaBOARD are
either trademarks or register ed trademarks of Seagate Technol­ogy, Inc. or one of its subsidiaries. All other trademarks or regis­tered trademarks are the property of their respective owners.

No part of this publication may be re pro duced in any form without

written permission from Seagate Technology, Inc.

Barracuda 4LP FC Installation Guide, Rev. A 1

Preface

This manual contains information for users of Seagate Barra-

cuda 4LP FC (Fibre Channel interface) disc drives. It provides

technical support information, performance specifications, instal-

lation instructions, and a troubleshooting section. Additional

information is available in the Barra cuda 4LP FC Product Man-

ual (part number 77767494). Contact your Seagate sales repre-

sentative if you need to order this publication.

Electrostatic discharge p rotecti on

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

semiconductors 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

2 Barracuda 4LP FC Installation Guide, Rev. A

grounded to avoid potentially damaging static discharges.

• 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
static electricit y from the carrier or tra y prior to inserting it into
the system.

Important safety inform ati on and precau tions

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 oth­ers. The cautions point out conditions or practices that may dam­age 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 tem­peratures are usually highest.

Barracuda 4LP FC Installation Guide, Rev. A 3

• Follow the precautions listed above in “Electrostatic discharge
protection.”

• Do not remove any circuit boards from the drive chassis.
Return the entire dri ve 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, the drive is designed to be installed and oper­ated in accordance with UL1950, EN60950, CSA C22.2 950­M89, VDE0805 and IEC950.

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
accepta b il ity 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 protect ion on drive SELV supply voltages.

4 Barracuda 4LP FC Installation Guide, Rev. A
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
through the Seagate Safety Department to assist the subsystem
designer.

Wichtige Sich erh eitsh in wei se

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, zuver­lässigen Betrieb dieser Einheit zu gewährlei sten.

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.

Barracuda 4LP FC Installation Guide, Rev. A 5
Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht-

shinweise:

• Beachten Sie alle Warn- und Vorsichtshinweise in diesem
Handbuch.

• 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 aus, bevor Sie mit den Installations-und Entfernung­sarbeiten 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 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 führen.

• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus
dem Laufwerk nehmen! Falls die HDA beschä dig t ist, schicken
Sie das gesamte Laufwerk zur Reparatur ein.

6 Barracuda 4LP FC Installation Guide, Rev. A

• 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.

Als Teilkom ponente ist dieses Laufwerk für die Installation und
den Betrieb in Übereinstimmung mit UL 1950, EN60950, CSA
C22.2 950-M89 und VDE0805 vorgesehen.

Seagate ist ständig b emüht, die Zulassungsf ähigkeit von
Seagate -Produk ten im Rah men der ge genw ärtig gelten den
Standards zu gewährleisten. Zu den typischen Anwendungen
dieser Festplattenwerke zählen Systemeinbau durch den
Kunden un d die Ko nstruk tion von Unt ersystemen. Sicherheits­behörden gewähren eine bedingte Zulassung für Komponenten
wie das Barracuda-Festplattenlaufwerk vorbeha ltlich der
endgültigen Zulasssung im Endprodukt. Designer von Untersys­temen sind dafür verantwortlich, die Voraussetzungen für die
Einhaltung sicherhe its- o d er aufsichtsbehö rdl ich er Vorschri ften
in ihren Endprodukten und - falls gesetzlich vorgeschrieben - für
die Zulassung zu schaffen. Eine Grundvoraussetzung zur Ein­haltung der Sicherhei tsanforde rungen ist d ie Bereitst ellung
eines Überlastschutzes für die SELV-Versorgungsspannungen
des Laufwerks.

Dieses Gerät ist ei ne Baugruppe und unt erliegt als solche nicht
den Anforderungen der FCC oder ähnlicher nationaler Behörden
für eigenständige Geräte. Technische Te stergebnisse zu elek­tromagnetische Strahlung sind f ür Designer von Untersystem en
auf Anfrage von der Seagate-Sicherheitsabteilung erhältlich.

Barracuda 4LP FC Installation Guide, Rev. A 7

European Uni on Compl iance

If this model has the CE Marking, it complies with the European
Union requirements of the Electromagnetic Compatibility Di rec­tive 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 Austra­lia/New Zealand Standard AS/NZS3548 1995 and meets the
Electromagnetic Compatibility (EMC) Framework requirements
of Australia’s Spectrum Management Agency (SMA).

Seagate uses an independent laboratory to confirm compliance
to the above directives. The drive was tested in a representative
system for typical applications. The sele cted system represents
the most popular characteristics for test platforms. The system
configurations include:

• 486, Pentium, and PowerPC Microprocessors

• 3.5-inch Floppy Disc Drive

• Keyboard

• Monitor/Display

• Mouse

• Printer

Although the test system with this Seagate model complies to
the directives, we cannot guarantee that all systems will comply.
The computer manufacturer or system integrator shall confirm
EMC compliance and provide CE Marking for their product.

8 Barracuda 4LP FC Installation Guide, Rev. A

Seagate technical 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 need additional assistance with your Seagate
other Seagate products, use one of the Seagate technical sup­port services listed below.

SeaFONE® 1-800-SEAGATE

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
drives and tape drives. This service is available 24 hours daily
and requires a touch-tone phon e . International callers can reach
this automated self-help service by dialing 408-456-4496.

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 I nter n et fr om Se ag ate ’s Wo rld Wid e W eb h om e p age

(http://www.seagate.com) or Seagate’s ftp server (ftp://
ftp.seagate.com). You can also send E-mail with your ques-
tions to Di scSup port @ Seag ate.c om or TapeSupport @
Seagate.com.

®

drive or

Barracuda 4LP FC Installation Guide, Rev. A 9

Seagate CompuServe forum

Online technical support for Seagate products is available on
CompuServe. To access our technical support forum, type

seagate

. This forum provides information similar to that found on

go

SeaBOARD. In addition, you can type questions or browse
through previous questions and answers on the forum mes­sages.

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 stop bit (8-N-1).

Location Phone number

Australia 61-2-9756-2359
England 44-1628-478011
France 33 1-48 25 35 95
Germany 49-89-140-9331
Singapore TBA
Taiwan 8 86-2-719-6075
Thailand 662-531-8111
USA Disc: 408-434-1080; Tape: 408-456-4415

10 Barracuda 4LP FC Installation Guide, Rev. A

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
England 44-1628-894084
USA 1-800-SEAGATE or 408-456-4496

Seagate 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
England 44-1628-890660
France 33 1-46 04 42 50
Germany 49-89-1430-5100
Hong Kong 852-2368 7173
Japan 81-3-5462-2979
Korea 82-2-556-7294/4251
Singapore 65-488-7528
Taiwan 8 86-2-715-2923
USA 408-944-9120

Barracuda 4LP FC Installation Guide, Rev. A 11

Direct-support servi ces

Seagate 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 A.M. to 5:00 P.M., M–F)
England 44-1628-894083 (10:00

2:00

P.M. to 5:00 P.M., M–F)

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

2:00

P.M. to 5:00 P.M., M–F)

Germany Disc: 49-89-140-9332; Tape: 49-89-140-9333

(9:30

A.M. to 12:30 P.M., 2:00 P.M. to 4:00 P.M.,

M–F)
Hong Kong 852-2368 9918
Korea 82-2-556-8241
Singapore 65-488-7584 (9:00

to 5:00

P.M., M–F)

A.M. to 12:00 P.M., 2:00 P.M.

Taiwan 8 86-2-514-2237
USA Please dial 1-800-SEAGATE or 408-456-4496

for the specific product telephone number.

(6:00

A.M. to 11:15 A.M., 12:30 P.M. to 5:00 P.M.,

Pacific time, M–F)

SeaTDD™ 408-944-9121

Using a telecommunications device for the deaf (TDD), you can
send questions or comments 24 hours daily and exchange mes­sages with a technical support specialist between 6:00
11:15

A.M. and 12:30 P.M. to 5:00 P.M. (Pacific time) Monday

through Friday.

xxxx

).

A.M. to 1:00 P.M.,

A.M. to 12:30 P.M.,

A.M. to

12 Barracuda 4LP FC Installation Guide, Rev. A

Customer service centers

Seagate direct OEM, Distribution, and System Integrator cus­tomers sh ould contact their Seagate service representative for
warranty information. Other customers should contact their 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 Australia 65-485-3595 65-485-4980
Europe, Middle East,

and Africa 31-2031- 67300 31-2065-34320
Japan 81-3-5462-2904 81-3-5462-2979
USA 1-800-468-3472 405-949-6740

Other Americas (Brazil,

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

Manufacturer’s representatives

Brazil

MA Informatica 55-11-810-7794 55-21-253-6467
Canada

Memofix

Adtech

Mexico

Abicom Seamax

SA DE CV 525-546-6965 525-546-4888

905-660-4936
905-812-8099
1-800-624-9857

905-660-8738
905-812-7807

Barracuda 4LP FC Installation Guide, Rev. A 13

General description

Barracuda 4LP FC disc drives are high-speed, random-access
digital-data storage devices designed to be used within a host
system with a Fibre Channel-Arbitrated Loop peripheral inter­face.

The drive is a component for installation in an enclosure
designed for the drive. The disc drive must receive adequate
cooling (refer to “Providing adequate cooling”) and it must be
sufficiently grounded and shielded from emissions. The Barra­cuda 4LP FC Product Manual (part number 77767494) contains
guidelines for a properly designed enclosure.

Figure 1: Barracuda 4LP FC disc drive

14 Barracuda 4LP FC Installation Guide, Rev. A

Characteristics

ST32171FC ST34371FC ST34571FC

Interface <------------ Fibre Channel ------------>
Capacity

Unformatted (Gbytes)
Formatted (Gbytes)

1

2.65

2.15

5.31

4.35

5.54

4.55

Recording

Cylinders (user)
Read/write data heads
Avg bytes/track

5,178
5
102,500

5,178
10
102,500

5,178
10
106,980

Access time

Average read (msec)
Average write (msec)

9.4

10.4

9.4

10.4

9.4

10.4

Disc rotation

RPM
Average latency (msec)

7,200

4.17

7,200

4.17

7,200

4.17

Data transfer rate

Maximum instantaneou s

100

100 100

(Mbytes/sec)

1. The specified formatted capacities are calculated with the standard OEM sector

size (512 bytes per logical block) and sparing.

ST34371FC

ST32171FC

DC power requirements(±5%)1+5 V +12 V +5 V +12 V

Maximum start current

Maximum operating current
Average idle current

1. For more detailed power information, refer to the Barracuda 4LP FC Product

Manual, publication number 77767494.

1.77A

1.80A

1.61A

2.50A

0.89A

0.51A

ST34571FC

1.77A

1.80A

1.61A

2.69A

0.91A

0.53A

Barracuda 4LP FC Installation Guide, Rev. A 15

Installing the Barracud a 4LP FC drive

To install a Barracuda 4LP FC drive, simply plug the drive
directly into your system’s Fibre Channel backpanel 40-pin sin­gle connector attachment (FC-SCA). There are no jumpers or
terminators on the drive, and power is supplied through the con­nector. Table 1 on page 24 lists the pin descriptions of the 40-pin
FC-SCA.

Read the following general information topics to ensure your
drive is installed properly:

• Providing adequate cooling

• Mounting the drive

• Formatting the drive

Providin g adequ ate cool ing

The enclosure design must ensure adequate cooling for the
drive. The maximum ambient temperature is 50
rated MTBF). Refer to Fi gure 2 on page 17 for an illustration
showing suggested air flow patterns.

The drive’s product manual (77767494) describes how to evalu­ate the air-flow design. The evaluation consists of ensurin g that
the case temperatures of certain critical components remain
within acceptable limits during drive operation.

We recommend orienting the drive or directing the air flow in a
way that creates the l east 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 n earby
heat sources.

o

C (30oC for the

16 Barracuda 4LP FC Installation Guide, Rev. A
Figure 2 shows one design approach with one or more fans used

to generate air flow. The air-flow pattern can be created by the
fans either pushing or drawing air. The overall flow pattern must
be directed from side to side in most FC-SCA systems.

Kühlung des System s

Die Gehäusekonstruktion muß eine ausreichende Kühlung des
Laufwerkes gewährleisten. Die Umgebungstemperatur darf
maximal 50

Die Produkthandbuch Barracuda 4LP FC (Dokument 77767494)
enthalten Anweisungen zur Beurteilung der Luftstromkonstruk­tion. Die Beurteilung muß sicherstellen, daß sich die Gehäuse­temperatur bestimmter kritischer Komponenten bei
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.Wir
empfehlen, das Laufwerk so zu orienti eren oder den Luftstrom
so zu lenken, daß der geringste Luftstromwiderstand vonvorne
nach hinten oder von hinten nach vorne verla ufen.

o

C betragen (30oC für der MTBF).

Barracuda 4LP FC Installation Guide, Rev. A 17

Above unit

Under unit

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

Above unit

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

Figure 2: Suggested air flow
Abbildung 2. Empfohlener Luftstromverlauf

Under unit

18 Barracuda 4LP FC Installation Guide, Rev. A

Mounting the drive

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.

You may mount the drive in any orientatio n (horizontally, verti­cally, or any combination thereof); however, you must ensure
that the drive receives adequate air flow for cooling.

Mount t he 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. See
Figure 3.

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.

Installation des La ufwer kes

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, ver­tikal oder schräg) installiert w erden; jedoch muß dafür gesorgt
werden, daß ein ausreichender Luftstrom zur Kühlung des Lauf­werkes vorhanden ist.

Befestigen Sie das Laufwerk mit vier 6-32-UNC-Schrauben am
Gehäuse des Host-Systems. Die beiden Seiten des Laufwerkes
sind mit jeweils zwei Befestigungslöcher versehen, die

Barracuda 4LP FC Installation Guide, Rev. A 19
Unterseite des Laufwerkes weist vier weitere Befestigungslöcher

auf. Siehe Abbiludung 3.
Gemessen von der Außenfläche des Gehäuses dürfen die

Schrauben maximal 3,81 mm in die Befestigungslöcher des
Gehüuses hineinragen. Die Schrauben müssen gleichmäßig,
jedoch nicht zu fest, angezogen werden. Wenn sich eine
Schraube nicht ohne Widerstand einschrauben läßt, sind die
Gewinde nicht korrekt aneinander ausgerichtet.

20 Barracuda 4LP FC Installation Guide, Rev. A

[3]

C

[1]

N

Pin 1

Connector Centerline

J

[2]

H

K

A

0.809

[4]

B

M

G

D

F

E

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 0.20 in. (5.08 mm).
Screw tightening torque 6.0 in-lb (.675 NM) max with
minimum thread engagement of 0.12 in. (3.05 mm).



[3] Interface connector can extend past the 
"A" dimension by 0.040 in. (1.02 mm).



[4] Connector is centered (side to side) on drive 
within ±0.020 in. (.508 mm).

A
B
C


D
E
F
G


H
J
K
L
M
N



Figure 3: Dimensions
Abbildung 3: Laufwerkabmessungen

L

Dimension Table

Inches

± .010

5.74 
± .010

4.00 
+ .021

1.00 
– .010



± .010

2.362
± .020

.620

± .010

4.000
+ .010

.250

– .005



± .010

1.750
± .010

3.750
± .020

2.370
± .010

1.00 
± .010

4.000
+ .018

0.181
– .013

Millimeters

145.80 

101.60 
+ .53

25.40 


60.00 

15.75 

101.60 

6.35 


44.45 

95.25 

60.20 

25.4 

101.6 

4.597

± .25
± .25

– .25

± .25
± .50
± .25

+ .25
– .12

± .25
± .25
± .50
± .25
± .25

+ .45
– .33

Barracuda 4LP FC Installation Guide, Rev. A 21

Inserting the driv e

Most systems provide a way to insert the drive using a carrier or
tray which allows the drive to be hot-plugged into the system’s
Fibre Channel 40-pin single connector attachment (FC-SCA).
Refer to your system documentation about the method they pro­vide and follow their instructions.

When installing the drive on a carrier or tray, discharge the static
electricity from t h e carrier or tray prior t o inserting it into the sys­tem.

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
which has previously been used to store data
unless you intend to erase all user data).

Note. Seagate is not responsible for lost user data.

1. Supply DC power to the drive (power is supplied to the drive
through the 40-pin FC-SCA).

2. Format the disc drive. This drive i s designed to operate with
a variety of operating systems. Refer to your system and
Fibre Channel controller manual for information about
selecting and formatting the drive.

22 Barracuda 4LP FC Installation Guide, Rev. A

Enabling write cache

Write caching is a feature that allows the drive to transfer write
data to its own cache, tell the controller that the task is complete,
and then actually complete the write at a later time. This
improves write performance by freeing the CPU to go on to its
next command.

Warning. Information can be lost if you enable write cache

and there is a system failure (for example, power
failure) before the data has a ctually been ph ysically
written to the disc.

OEM drives are shipped with write ca che disabled by default to
enhance data integrity. If you want to enable the write cache,
refer to your system’s drive controller and software utility docu­mentation. Seagate provides an ASPI utility that you can use in a
PC compatible system to enable the write cache. It is available
on Seagate’s CompuServe forum and on the Seagate BBS
(refer to “Seagate technical support services” on page 8).

Connectin g rem o te LED s

You can connect remote LEDs using J6 (see Figure 4).
Connect the anode (usually the longer LED connector) to the

+5V pin, and the cathode to the appropriate LED output pin. For
example, if you want to attach an LED which l ights up when the
drive is active (reading or writing), connect the LED’s anode con­nector to J6 pin 11 and the cathode, through an appropriate
external current-limitin g resistor, to J6 pin 8 or pin 12.

Barracuda 4LP FC Installation Guide, Rev. A 23

Drive
Front

J6

Reserved

Port A Bypass LED [1]
Port B Bypass LED [1]
Fault LED [1]
Reserved
Active LED [2]
+5V
Active LED [2]
Ground [3]

[1] The drive has a 2.2K ohm resistor in series with this

LED driver. Tie the minus side of an external hi gh­efficiency LED (i.e., 2m a) to this pin. Connect the
plus side of the LED to +5V.

[2] An external current-limiting resistor is required when

connecting an LED to thi s pin. Connect the minus
side of the resistor/LED combination to this pin. Con­nect the plus side to +5V. Thi s pin is connected in
parallel with the signal of the same name in the inter­face connector (J1).

[3] Jumper storage location (across pins 2 and 4).

Figure 4: LED indicator connector (J6)

Pin 1

24 Barracuda 4LP FC Installation Guide, Rev. A

Table 1: FC-SCA pin descr iptions

Pin/contact Signal name Signal type

1* –EN bypass port A TTL out put
2* 12 Volts
3* 12 Volts
4* 12 Volts
5* –Parallel ESI TTl output
6* Ground (-DRV present)
7* Active LED out Open collector out
8* Reserved
9* S tart _1 TTL in pu t
10* St art _2 TTL input
11* –EN bypass port B TTL output
12* SEL_6 TTL inpu t
13* SEL_5 TTL input
14* SEL_4 TTL inpu t
15* SEL_3 TTL input
16* F ault LED ou t Open collector out
17* Reserved NC
18* Reserved NC
19* 5 Volts
20* 5 Volts
21 12 Volts charge
22 Ground
23 Ground
24* +Port A_in Diff. PECL input pair
25* –Port A_in

Barracuda 4LP FC Installation Guide, Rev. A 25

Pin/contact Signal name Signal type

26 Ground
27* +Port B_in Diff. PECL input pair
28* –Port B_in
29 Ground
30* +Port A_out Diff. PECL output pair
31* –Port A_out
32 Ground
33* +Port B_out Diff. PECL output pair
34* –Port B_out
35 Ground
36 SEL_2 TTL in pu t
37 S EL_1 TTL in put
38 SEL_0 TTL in pu t
39 Reserved NC
40 5 Volts charge

26 Barracuda 4LP FC Installation Guide, Rev. A

Troubleshooting

Before calling Seagate Technical Support, please read the pos­sibilities discussed below. The suggestions presented here will
resolve the majority of installation problems.

General instal lati on troub les ho otin g

• Check system compatibilit y. This is a Fibre Channel-Arbi-

trated Loop (FC-AL) device. Check your system documenta­tion to ensure that it supports FC-AL devices.

• Check the physical attachment. Ensure that the drive is

properly mated with the backpanel Fibre Channel single con­nector attachment (FC-SCA).

• Check to ensure that drive is receiving power. Insert the

drive into your system. Listen carefully for th e sound of the
drive motor spinning up. If the drive motor does not spin up,
check the power supply. If your power supply is functioning
properly, but the drive does not spin u p, contact the company
from which you purchased the drive.

• Check your system or backpanel documentation to

ensure you have set options in accordance with the man­ufacturer ’s recommendations. All device options, including

addresses, are set at the backpanel within the host system or
through system software. Check your host system documen­tation about how to set these options in your particular system.

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

Publication Number: 77767495, Rev. A, Printed in USA