Seagate Barracuda 18LP FC Installation Manual

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Barracuda 18LP FC

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Fibr e C ha nn el

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Disc Drive

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ST318275FC

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ST39175FC

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Installation Guide

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Contents

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

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

Important safety information and precautio ns.............................2

Wich tige S ic h er h e its h in w ei se...... .......... .. ... ..... .. .......... .. ... ..... .. .... 4

Seag a te Technolo gy su ppo rt serv ic e s ... .. ..... ... ......... ... .. ..... ... .. .... 8

General description ................................................................... 14

Inst alling the Barracuda 18LP FC driv e..... .. .................... .. ........16

Kühl u ng de s Sy s te ms. ... .... ... .. ..... ... .. ..... .. .......... ... .. ..... .. .......... .. 17

Troubleshooting......................................................................... 27

©1999 Seagate Technology, Inc. All rights reserved
Publication Number: 77767542, Rev. A
May 1999

Seagate, Seagate Technology, and the Seagate logo are regis­tered 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 thei r respective owners.

No part of this publication may be reproduced in any form without

written permission from Seagate Technology, Inc.

Barr acuda 18LP FC Installation Guide, Rev. A 1

Preface

This manual contains information for users of Seagate Barra-

cuda 18LP FC (Fibre Channel interface) disc drives. It provides

technical support information, perf ormance specifications, inst al-

lation instructions, and a troubleshooting section. Additional

infor m ation is available in the Barracuda 18LP FC Product Man-

ual (part number 77767541). Cont act your Seagate sal es repre-

senta tive if you need to order thi s publication.

Electrostatic discharge protection

Caution.

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

All drive electronic assemblies are sensitive to static electricity,

due to the electrostatically sensitive devices used within the

drive circuitry. Although some devi ces such as metal -oxid e sem i-

conductors are extremely sensitive, all semiconductors, as well

as some resistors and capacitors, may be damaged or degraded

by exposure to static electricity.

Electr ost 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 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 18LP FC Installation Guide, Rev. A

grounded to avoid potentially damagi ng static discharges.

• Do not remove any circuit boards from the driv e.

• Never use an ohmmeter on any circuit boards.

• When installing the drive on a carrier or tray, discharge the

static electricity from the carrier or tray prior to inserting it into
the system.

Importan t safety information and precautions

Caution.

Use forced-air ventilation when bench-testing the
drive to ensure proper cooli ng of drive compo nents.

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 minim ize or eliminat e the risk of pers onal injury. The warnings
point out conditions or practices that may endanger you or oth­ers. The cautions point out conditions or prac ti ces that ma y dam­age the uni t, possibly making it unsafe for use.

Always observe the following warnings and precautions:

• Fol low 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 befo re 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 are usually highest.

Barr acuda 18LP FC Instal lation Guide, Rev. A 3

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

• Do not remove any circuit boards from the drive chassis.
Return the entire drive for depot repair if any circuit board is
defective. Removal of circuit boards by personnel not perfor m­ing 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 repair­abl e. If the sealed HDA is op ened by personnel not per forming
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, CAN\CSA C22.2
950-95, VDE0805 and IEC950.

Seagate takes all reasonable steps to ensure that its products
are certifiable to currently accepted standards. Typical applica­tions of these di sc 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
acceptabilit y in obtaining saf ety-regulato ry agency compliance in
their end-use products and for certifying where r equi red by law.
A necessary part of meeting safety requi rem ents is the provision
for overcurrent protecti on on drive SELV supply voltages.

4 Barracuda 18LP FC Installation Guide, Rev. A
This unit is a component par t 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
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, zuver­lässigen Betri eb 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 Risi ko behaftet ist.

Die Warn- und Vorsichtshinweise sind nicht allumfassend! Es ist
uns einfach nicht möglich, alle Wartungsmethoden oder die
eventuellen Risiken j eder Methode zu kennen, zu beurt eilen 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 Sicher heit noch die Leistung der Einheit gefährdet.

Barr acuda 18LP FC Instal lation 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 Install ati ons-und Entfernungsar ­beiten beginnen.

• Wenn das Laufwerk in einem Einbaugestell oder Gehäuse

montier t ist, sorgen Sie dafür, da ß 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 dor t die Temperatur gewöhnlich am
höchsten i st.

• Befolgen Sie die oben unter “Electrostatic Discharge Protec-

tion” angegebenen Sicherheitsm aßnahmen.

• 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 di e HDA beschädigt i st, schi cken
Sie das ges am te Lauf werk zur Repara tur ein.

6 Barracuda 18LP FC Installation Guide, Rev. A

• Die HDA ist nicht vor Or t 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.

Als Tei lkomponent e ist diese s Laufwe rk für di e Insta llation 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
Seaga te-Produ kten im R ahmen de r gegenwär tig ge ltenden
Stan da rds z u gewährleisten. Zu den typischen Anwendungen
dieser Festplattenwerke zählen Systemeinbau durch den
Ku nden und di e Kon strukti on von Unter systemen. Sicherh eitsbe ­hörden gewähren eine bedi ngte Zul assung für Komponente n wie
das Barracud a-Festplatt enlaufwerk vorbehaltlich der endgültigen
Zulass sun g im E ndprod ukt. De sign er von Un tersyste men s ind
dafür verantwor tlich, die Voraussetzungen für die Einhaltung
sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren
Endprodukten und - falls gesetzlich vorg eschr ieben - für die
Zula ss ung zu sc ha ffen. Eine Gr un dvorau sset zu ng zu r E inha l­tung der Sicherheitsanforder ungen ist die Bereitstellung eines
Über lastschutzes für die SELV-Versorgungsspannungen des
Laufwerks.

Dieses Gerät ist eine Baugruppe und unterl iegt als solche ni cht
den Anforderungen der FCC oder ähn li cher nationaler Beh örden
für eigenständige G eräte. Techni sche Testergebnisse zu elektro-
magneti sche Str ahlung si nd für Designer v on Untersy stemen auf
Anfr age von der Seagate-Sicherheitsabteilung erhältlich.

Barr acuda 18LP FC Instal lation Guide, Rev. A 7

Euro pean Union Compliance

If this model has the CE Marking, it complies with the European
Union requirements of the Electromagnetic Compatibility Direc­tive 89/336/EEC of 03 May 1989 as amended by Directi ve 92/31/
EEC of 28 April 1992 and Directive 93/68/EEC of 22 July 1993.

Australi an C -Ti ck

If thi s 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 Austr alia’s Spectrum Management Agency (SMA).

Seagate uses an independent laboratory to confirm compliance
to the above directives. The dr ive was tested in a representative
system for typical applications. The select ed system represents
the most popular characteristics for test platforms. The system
configurations incl ude:

• 486, Pentium, and PowerPC Microprocessors

• 3.5- inch Flopp y D isc Drive

• Keyboard

• Monitor/Display

• Mouse

• Printer

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

8 Barracuda 18LP FC Installation Guide, Rev. A

Seagate Techno logy support serv ices

Onli n e Serv ic es

Internet

For online information about Seagate products, visit
www.seagate.com or e-mail your disc or tape questions to:

Presales Support:

Disc: http://www.seagate.com/support/email/

email_presales.shtml

Tape: http://www.seagate.com/support/email/

email_tape_pr esales.shtml
Tape_Sales_Suppor [e-mail]

Technical Support

Disc: http://www.seagate.com/support/email/

email_disc_support.shtml

Tape: http://www.seagate.com/support/email/

email_tape_support .shtml

SeaBOARD®

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

:

is a computer bulletin board system that contains

or

[e-mail]

or

or

DiscSuppo [e-mail]

or

[e-mail]

avail a bl e wor l d w ide .

Automa ted Services

SeaFONE

800-732-4283) to access our automated self-help services.
Using a touch-tone phone, you can find answers to service

1-800-SEAGATE)

® (

is Seagate's toll-free number (1-

Barr acuda 18LP FC Instal lation Guide, Rev. A 9
phone numbers, commonly asked questions, troubleshooting

tips and specifications for disc drives and tape drives 24 hours
daily. International callers can reach this service by dialing +1­405-936-1234.

SeaFAX

®

is Seagate's automated FAX deliver y system. Using a
touch-tone phone, you can obtain technical support inform ation
by retu rn FAX 24 hours daily. This service i s available worldwi de.

Presales Support

Our Presales Support staff can help you determine which
Seagate products ar e best suited for your speci fic appl ication or
computer system.

Seagate Express

You can purchase select tape products and tape accessories
through Seagate Express 24 hours daily by calling 1-800-531­0968 or by fa xing your order to: [phone].

Technical Support

If you need help installing your drive, consult your dealer. Deal­ers are familiar with thei r unique system configurations and can
help you with system conflicts and other technical issues. If you
need additi onal help, you can talk to a Seagat e technica l support
specialist. Before calling, note your system configuration and
drive m odel number (ST

SeaTDD™([phone])

for the deaf (TDD). You can send questions or comments 24
hours daily and exchange messages with a technical support

####).

is a telecommunications device

10 Barracuda 18LP FC Installation Guide, Rev. A
specialist from 8:00 A.M. to 12:15 P.M. and 1:30 P.M. to 6:00

P.M. (central ti m e) Monday through Friday.

Custo mer S er vice (C SO)

Warra nty Repai r

Seagate offers worldwide customer support for Seagate drives.
Seagate direct OEM, Distribut ion and System I ntegrat or custom­ers should contact their Seagate service center representative
for warranty information. Other customers should contact their
place of purchase.

Authorized Service Centers

If you live out side the US, you can contact an Authorized Service
Ce nte r for se rvi ce or re pa ir.

USA/Canada/Latin Am erica Support Services

Presales Supp ort

Disc:

Tape:

Te chni c al Su ppor t (Se aFONE )

1-800-SEAGATE or [phone] (for specific product
phone number)

1-877-271-3285 or FAX: [phone]
[phone]

1-800-626-6637 or FAX: [phone]
[phone]

FAX:

SeaFAX 1-800-SEAGATE
SeaTDD [phone]
SeaBOARD

Disc: +

1-405-936-1685;

Disc: +

Tape:

1-405-936-1600;

[phone]

Tape:

[phone]

Barr acuda 18LP FC Instal lation Guide, Rev. A 11

Warra nty Repai r

USA 1-800-468-3472 FAX: [phone]
Mexi co and
Latin Ame ric a [phone] FAX: [phone]

Authorized Service Centers

Brazil

MA Informatica

[phone] FAX: [phone]

Canada

Memofix
Adtech

1

1

[phone] FAX: [phone]
[phone] or FAX: [phone]
1-800-624-9857

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 countr y is not listed here, dial our European call center at
[phone] from 8:30
time) Monday through Friday. The European call center is

A.M

. to 5:00 P.M. (European central

located in Amsterdam, The Netherlands.

Call Center

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

1. Authorized Service Centers

12 Barracuda 18LP FC Installation Guide, Rev. A
Ire land 1 800-55 21 22

Ita ly 1 677 90 695
Netherlands 0 800-732 4283
Norway 800-113 91
Poland 00 800-311 12 38
Spain 900-98 31 24
Sweden 0 207 90 073
Switzerland 0 800-83 84 11
Turke y 00 800-31 92 91 40
United Kingdom 0 800-783 5177

SeaBOARD

Germany [phone]

Fax Services—All European Countries

Presales/Technical Support/Warranty Repair [phone]

Africa/Middle East Support Services

For presales, technical support, warranty repair and FAX ser­vice s in Africa and the Middle East, dial our European cal l center
at [phone] from 8:30 a.m. to 5:00 p.m. (European cen­tral 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

Te chni c al Su ppor t

Australia [phone] FAX: [phone]
Hong Kong [phone] FAX: [phone]
Japan — FAX: [phone]

Barr acuda 18LP FC Instal lation Guide, Rev. A 13
Singap ore [phone] FAX: [phone]

Taiwan [phone] FAX: [phone]

SeaFAX

Aust ralia [phone]

Warra nty Repai r

Japan [phone] FAX: [phone]
Asia/Pacific and [phone] FAX: [phone]

Australia

14 Barracuda 18LP FC Installation Guide, Rev. A

General description

Barracuda 18LP FC disc drives are high-speed, random-access
digital-data storage devices designed to be used within a Fibre
Channel host system.

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 18LP FC Product Manual (part number 77767541) con­tain s guidelines for a properly designed enclosure.

Figure 1: Barracuda 18LP FC disc dr ive

Barr acuda 18LP FC Instal lation Guide, Rev. A 15

Characteristics ST39175FC ST318275FC

Interface Fibre Channel Fibre Channel
Capacity

Unformatted (G bytes)
Formatted (Gbytes)

1

Recording

Cy l ind ers (us er )
Read /write data hea ds
Avg byt es /tr a ck

Access time

Average read (msec)
Average write (msec)

Disc rotation

RPM
Average latency (msec)

Data transfer r a te

Ma ximu m in stan taneo us

10.8

9.1

11,721
5
186,000

6.9

7.8

7,200 ( +/- 0.5%)

4.17

21.6

18.2

11,721
10
186,000

6.9

7.8

7,20 0 ( +/- 0. 5% )

4.17

106 106

(Mbytes/sec, per port)

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

size (512 bytes per logical block) and sparing.

ST39175FC ST318275FC

DC power requ irements(±5%)

Maximum start current
Maximum operating current
Average idle current

1. For more detailed power information, refer to the Barracuda 18LP FC Product

Manual, publication number 77767541.

1

+5 V +12 V +5 V +12 V

0.75A

0.75A

0.70A

2.0A

0.90A

0.55A

0.75A

0.75A

0.70A

2.0A

1.0A

0.65A

16 Barracuda 18LP FC Installation Guide, Rev. A

Installing the Barracuda 18LP FC drive

To install a Barracuda 18LP FC drive, simply plug the drive
directly into your system’s Fibre Channel backpanel 40-pin sin-
gle connector attachment (FC-SCA). There are no jumpers or
terminators on the drive, and power is supplied through the con­nector . Table 1 on page 25 lists the pin descript ions of the 40-pin
FC-SCA.

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

• Providing adequate cooling

• Mounti ng the drive

• Formatting the drive

Providing a dequa te co ol in g

The enclosure design must ensure adequate cooling for the
drive. The maximum ambient temperature is 50
rated MTBF). Refer to Figure 2 on page 18 for an illustration
showi ng suggested air flow patt erns.

The drive’s product manual (77767541) describes how to evalu­ate the air-flow design. The evaluation consists of ensuring that
the case temperatures of certain critical components remain
within acceptable limits dur ing 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

o

C (30oC for the

and disc assembly (HDA). Also, choose the shortest possible
path between the air inlet and exit. This minimizes t he distance
traveled by air that is heated by the drive and by other nearby
heat sources.

Barr acuda 18LP FC Instal lation Guide, Rev. A 17
Figure 2 shows one desig n approach with o ne 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 f rom side to side in most FC-SCA systems.

Kühlung des Systems

Die Gehäusekonstruktion muß eine ausreichende Kühlung des
Laufw erkes ge währlei sten. Die Umgebungstemper atur d arf max­imal 50

Die Produkthandbuch Barracuda 18LP FC (Dokument

77767541) enthalten Anweisungen zur Beurteilung der Luft­stromkonstruktion. Die Beurteilung muß sicherstellen, daß sich

o

C betragen (30oC f ür der MTBF).

die Gehäusetemperatur bestimmter kritischer Komponenten bei
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.Wir
empfehlen, das Laufwerk so zu orientieren oder den Luftstrom
so zu lenken, daß der geringste Luftstromwiderstand vonvorne
nach hi nten oder von hinten nach v orne verlaufen.

18 Barracuda 18LP FC Installation Guide, Rev. A

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

Under unit

in reverse direction (side to side)

Figure 2: Suggested air flow
Abbildung 2. Empfohlener Luftstromverlauf

Barr acuda 18LP FC Instal lation Guide, Rev. A 19

Mounting the drive

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

You may mount the drive in any orientation (horizontally, verti­cally, or an y combin ation ther eof ); howe v er, you m ust ensur e that
the drive receives adequate air flo w for cooling.

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 mount ing holes in the bott om of the driv e. See
Figure 3.

The maximum length that the screws should extend into the
chassis mounting holes is 0.15 inch (3.81 m m), 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 Laufwerkes

Beacht en Sie beim Handhaben und Anf assen 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
werd en , d aß ein ausreichender Luftstrom zur Kühlung des Lauf­werkes vor handen 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

20 Barracuda 18LP FC Installation Guide, Rev. A
Unter seite des La ufwerkes weist vier weit ere 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 kor rekt aneinander au sgerichtet.

Barr acuda 18LP FC Instal lation Guide, Rev. A 21

A

[1]

F

D

Motherboard Ref.

P

R[3]

Common centerline

E

B

H

1.875±.0051.875±.005

[4]

in the horizontal

(X axis) direction

of the drive

(.809)

Pin 1

J

K

[2]

N

Low
Profile

Half
Height

M

C

L

Notes:

Mounting holes three on each side,

[1]

6-32 UNC. Max screw length into
side of drive is 0.15 in. (3.81 mm).

Mounting holes four on bottom,

[2]

6-32 UNC. Max screw length into
bottom of drive is 0.15 in. (3.81 mm).

Keep-out zone for any components

[3]

on backplane.
Connector is centered on module

[4]

and flush with end of base.

Inches Millimeters

.136

A
B
C
D
E
F

H
K

L
M
N

P
R

J

5.75

4.00

1.026
.620

4.000
.250

3.750

2.380

1.750

0.181

1.622

1.620

.1215
.1215

±

0.025

±

0.015
max
ref

±

0.010
+

0.011

–

0.005

±

0.010

±

0.010

±

0.010
+

0.013

–

0.007
+

0.027

–

0.021

±

0.025
max
max

146.05

101.6

26.060

15.748

101.600

6.350

95.25

60.45

44.450

4.590

41.20

41.150

3.080

3.080

± .64
± .381

max
ref
± .25
+ .28
– .12

± .25
± .25
± .50

+ .33
– .18
+ .69
– .53
± .64
max
max

Figure 3: Dimensions
Abbildung 3: Laufwerkabmessungen

22 Barracuda 18LP FC Installation Guide, Rev. A

Inserting the drive

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 dr ive on a carrier or tray, discharge the static
electricity from the carrier or tray prior to inserting it into the sys­tem.

Formatting the drive

Warning.

Formatting a dri ve erases all user data. Be sure that
you understand this principle befor e formatting any
hard disc drive (it is not necessary to format a drive
which has previously been used to store data
unles s 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 suppli ed to the drive
thr ough the 40-pin FC-SCA).

2. Format the disc drive. This drive is 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.

Barr acuda 18LP FC Instal lation Guide, Rev. A 23

Enabling write cache

Write caching is a feature that allows the drive to transfer wr ite
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 actually been physically
written t o the di sc.

OEM drives are shipped with write cache 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 docu-
mentat ion. Seaga te prov ides an ASPI util ity that y ou can use in a
PC compatible system to enable the write cache. It is available
on Seagate’s web site (refer to “Seagate Technology support
services” on page 8).

Co nnecti ng remot e LEDs

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 indicates drive
activity, connect the LED’s anode connector to J6 pin 11 and the
cathode t o J6 pin 12 or connect to J6 pin 8 through an appropri­ate external current- limiting resistor.

Note.

The LED is on when the drive is idle and off when the
drive is processing commands.

24 Barracuda 18LP FC Installation Guide, Rev. A

Drive

Front

Pin 1

J6

Reserved

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

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

LED dr iver. Tie the mi nus side of a n external high­efficiency LED (i.e., 2ma) 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 this pin. Connect the minus
side of the resistor/LED combination to this pin. Con­nect the plus side to +5V. This 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)

Barr acuda 18LP FC Instal lation Guide, Rev. A 25

Table 1: FC-SCA pin descriptions

Pin/contact Signal name Signal type

1* –EN bypass port A TT L output
2* 12 Volts
3* 12 Volts
4* 12 Volts
5* –Par allel ESI
6* Ground

[1]

7* Active LED out Open collector out
8* Reserved
9* Start_1 TTL input
10* Start_2 TTL input
11* –EN bypass port B TTL output
12* SEL_6 TTL input/output
13* SEL_5 TTL input/output
14* SEL_4 TTL input/output
15* SEL_3 TTL input/output
16* Fault LED out Ope n co llect or out
17* Res e rved NC
18* Reserved NC
19* 5 Vo lts
20* 5 Vo lts
21 12 Volts charge
22 Ground
23 Ground
24* +Port A_in Diff. PECL input pair
25* –Port A_in

26 Barracuda 18LP FC Installation Guide, Rev. A

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* +Po rt B_out Diff. PECL output pair
34* –Port B_out
35 Ground
36 SEL_2 TTL input/output
37 SEL_1 TTL input/output
38 SEL_0 TTL input/output
39 Reser ved NC
40 5 Volts charge

*Short pins in mating backpanel connector.
[1] This pin may be connected to external logic to detect the presence of the drive.

The drive connects this pin to the common ground.

Barr acuda 18LP FC Instal lation Guide, Rev. A 27

Troubleshooting

Before call ing Seagate Technical Suppor t, please read the pos­sibilities discussed below. The suggestions presented here will
resol ve the majority of inst allation problems .

Gener a l in stallat ion tr ou b le s hooting

Check system compatibility.

•

device. Check your system documentation to ensure that it
supports FC devices.

Check the physical attachment.

•

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

This is a Fibre Channel (FC)

Ensure that the drive is

Check to ensure that drive is receiving power.

•

Insert the
drive into your system. Listen carefully for the 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 up, contact the company
fro m which you purchas ed 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
thr ough system soft ware . Chec k your host system docum enta­tion about how to set these options in your particular system.

Seagate Technol ogy, Inc.
920 Disc Drive, Scotts V alley , CA 95066-4544, USA

Publ ication Number: 7776754 2, Rev. A, Printed in USA