Seagate Cheetah 18LP FC, Cheetah 18LP FC ST318203FC Installation Manual

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Che et ah 18LP FC

••••••••••••••••••••••

Fibr e C ha nn e l

••••••••••••••••••••••

Disc Drive

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ST318203FC

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Installation Guide

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Contents

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

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

Important safety informati on and precautions.... ....... ...... ....... .. ... 2

Wich tige Sic h er h eitshi n weise.... ....... ....... ........ .. ....... ........ ....... .... 4

European U ni o n Complia n c e .... ....... ....... ........ .. ....... ........ ....... .... 7

Seagate Technology support services......................................... 8

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

Inst alling the Cheet ah 18LP FC drive.......... ....... .................. .. ... 16

Kühlung des Systems................................................................ 17

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

©1999 Seagate Technolo gy, Inc. All rights reserved
Publication Number: 83329430, Rev. A
March 1999

Seagate, Seagate Technology, and the Seagate logo are regis­tered trademarks of Seagate Technology, Inc. Cheetah, 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 owners.

No part of this publ ication ma y be reproduced i n any form without

written permission from Seagate Technology, Inc.

Cheetah 18LP FC Installation Guide, Rev. A 1

Preface

This manual contains information for users of Seagate Cheetah

18LP FC (Fibre Channel interface) disc drives. It provid es techni -

cal support information, performance specifications, installation

instructions, and a troubleshooting section. Additional informa-

tion is available in the Cheetah 18LP FC Product Manual (part

number 8332942 0). Contac t your Seagate sal es repres enta tiv e if

you need to order thi s publication.

Electrostatic discharge protection

Cauti on.

Removal of circuit boards by per sonnel not p erform­ing 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 circui try. Although some d evices such as metal-oxide semi-

conductors are extremely sensitive, all semiconductors, as well

as some resisto rs and capacit ors, may be dam aged or degraded

by exposure to static electricity.

Elect rost 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

2 Cheetah 18LP FC Installation Guide, Rev. A

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

Importan t safety information and precau tions

Caution.

Use forced-air ventilation when bench-testing the
drive to ensure prop er cooling of driv e com ponents.

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 ris k of pers onal injury. The w arni ngs
point out conditions or practices that may endanger you or oth­ers . The cautions point out conditions or practices that may dam­age the uni t, possibly making it unsafe for use .

Always obs erve the fo ll owing warnin gs 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 uni t befo re removing it.

• Ensure that the internal temperature of the rack or cabinet

does not exceed the limits defined for the drive when the drive
is mounted in an equipment rack or cabinet. When units are
stacked vertically, pay special attention to the top where tem-

Cheetah 18LP FC Installation Guide, Rev. A 3

peratures are usual ly highest.

• Follow 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 perform­ing depot repair will damage components and may void the
warranty.

• Do not remove the head and disc assembly (HDA) from the

drive. Return the entire drive for depot repair if the HDA is
defective.

• Do not attempt to disassemble the HDA. It is not field repair-

abl e. If the sealed HDA is opened by personn el not performing
depot repair, this will damage components and void the war-

rant y.
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 disc drives include customer packaging and sub­system design. Safety agencies conditionally cer tify 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 obtai ning safety- regulato ry agency compliance in
their end-use products and for certifying where required by law.
A necessary part of meeting saf ety requi rements is the provision
for ov ercurre nt protection on dri ve SELV supply voltages.

4 Cheetah 18LP FC Installation Guide, Rev. A
This unit is a component part and as such is not meant to com-

ply with FCC or similar national requirements as a stand-alone
unit. Engineering radiated emissions test results are available
through the Seagate Safety Depar tment 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 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 Risi ko behaft et 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 gewählt e Verfahren weder Ihre
persönliche Sicherheit noch die Leistung der Einheit gefährdet.

Cheetah 18LP 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 Entf ernungsar­beit en beginnen.

• Wenn das Laufwerk in einem Einbaugestell oder Gehäuse

montier t 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 Protec-

ti on” angegebenen Sic herheitsmaßn ahm en.

• 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 G aranti eanspruchs führ en.

• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus

dem Laufwerk nehmen! Falls die HDA beschädigt ist, schicken
Sie das ges am te Lauf werk zur Reparatur ein.

6 Cheetah 18LP FC Installation Guide, Rev. A

• Die HDA ist nicht vor Ort reparierbar und darf nicht auseinan-

dergenommen werden! Öffnen der versiegelten HDA durch
andere Personen als die für die werkseitige Reparatur zustän­digen hat eine Beschädigung der Komponenten und
Erlöschen des G aranti eanspruchs zur Folge .

Als Teil komponente is t dieses Laufwerk f ür die Ins tallation 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 Rahm en de r gegenwär tig ge ltenden
Stan da rds z u gewäh rl eiste n. Zu d en typi sch en A nwe nd unge n
dieser Festplattenwerke zählen Systemeinbau durch den
Ku nden und di e Kon stru ktion v on Unter systemen. Sicherh eit sbe­hörden gewähren eine bedingt e Zulassung für Kom ponenten wi e
das Cheetah-Fest plattenlaufwerk vo rbehaltlich der endgültigen
Zulass sung i m Endp rod ukt. Desi gner 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
Zula ss ung zu sc haf fen. E ine Gr und vorau ssetz u ng zu r Ein ha l­tung der Sicherheitsanforderungen ist die Bereitstellung eines
Überlastschutzes für die SELV-Versorgungsspannungen des
Laufwerks.

Dieses Gerät ist eine B augruppe und unter liegt als solche nicht
den Anforde rungen der FCC oder ähn li cher nati onaler Behör den
für eigenständige G eräte. Tec hnische Tester gebnisse zu el ektro­magneti sche Str ahlung si nd für Design er von Unte rsyst emen auf
Anfr age von der Seagat e-Sicher heitsabteil ung erhältlich.

Cheetah 18LP FC Installation Guide, Rev. A 7

European Union Compliance

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

Australia n C- Ti ck

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 Ma nagement 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 selected system represents
the most popular characteristics for test platforms. The system
confi gurati ons include:

• 486, Pent ium, and PowerPC Microproc essors

• 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 prov ide CE Marking for their product.

8 Cheetah 18LP FC Installation Guide, Rev. A

Seagate Technology support services

Online Serv ices

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.seag ate.com/support/email/

email_tape_presales.shtml
[e-mail]

Techn ical Support

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

email_disc_support.shtml

Tape: http://www.seag ate.com/support/email/

email_tape_support.shtm l

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

DiscPres ales@Seagate .com

or

or

DiscSupport@Seagat e.com

or

[e-mail]

avail a bl e worl d wide.

Automated Servi ces

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-

Cheetah 18LP FC Installation 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 delivery system. Using a
touch-tone phone, you can obtain technical suppor t information
by ret u rn FAX 24 hour s daily. This service is available worldwide.

Presales Suppor t

Our Presales Support staff can help you determine which
Seagate products are best suited for your specific application or
computer system.

Seagate Express

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

Te c hnical Support

If you need help 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 help, you can talk to a Seagate t echnical 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

xxxxx).

is a telecommunications device

10 Cheetah 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 time) Monday through Friday.

Custo mer Ser vice (CS O)

Warranty Re pair

Seagate offers worldwide customer support for Seagate drives.
Seagate direct OEM , Di stri buti on and System Integrator custom­ers should contact their Seagate service center representative
for warranty information. Other customers should contact their
plac e of purchase.

Authorized Service Centers

If your live outside the U.S., you can contact an Authorized Ser­vice Ce nter for service or repair.

USA/Canada/Latin America Support Services

Presales Supp or t

Disc:

Tape:

Technica l Su pport (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]

Cheetah 18LP FC Installation Guide, Rev. A 11

Warranty Re pair

USA/Canada 1-800-468-3472 FAX: [phone]
Lati n Americ a [phone] FAX: [phone]

Authorized Service Centers

Brazil

MA Informatica

[phone] FAX: [phone]

Canada

Memofix
Adtech

[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 country 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

loca ted 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
Ire land 1 800-55 21 22
Ita ly 1 677 90 695
Netherlands 0 800-732 4283

12 Cheetah 18LP FC Installation Guide, Rev. A
Norway 800-113 91

Poland 00 800-311 12 38
Spain 900-98 31 24
Sweden 0 207 90 073
Swit zerland 0 800-83 84 11
Turkey 00 800-31 92 91 40
Unit ed Kingdom 0 800-783 5177

SeaBOARD

Germany [phone]

Fax Services—All European Countri es

Presal es/Technical Support/W arrant y Re pair [phone]

Africa/Middle East Suppor t Services

For presales, technical support, warranty repair and FAX ser­vice s in Africa and the Middl e East, dial our Euro pean call 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

Technica l Su pport

Austra li a [phone] FAX: [phone]
Hong Kong [phone] FAX: [phone]
Japan — FAX: [phone]
Singap ore [phone] FAX: [phone]
Taiwan [phone] FAX: [phone]

Cheetah 18LP FC Installation Guide, Rev. A 13

SeaFAX

Australia [phone]

Warranty Re pair

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

Australia

14 Cheetah 18LP FC Installation Guide, Rev. A

General description

Cheetah 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
suff iciently grounded and shielded from emissions. The Cheet ah
18LP FC Product Manual (part number 83329420) contains
guidelines for a properly designed enclosure.

Figur e 1: Cheetah 18LP FC disc drive

Cheetah 18LP FC Installation Guide, Rev. A 15

Characteristics ST318203FC

Interface Fibre Channel
Capacity

Unformatted (Gbytes)
Formatted (Gbytes)

1

Recording

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

Access time

Average read (msec)
Average write ( msec)

Disc rotation

RPM
Average latency (mse c)

Data transfer r ate

21.6

18.2

9,801
12
153,284 to 229, 045

5.4

6.0

10,016

2.99

Ma ximum instantan eo us

106.3

(Mbytes/sec per port)

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

tor size (512 bytes per logical block) and sparing.

ST318203FC

DC power requirements(±5%)

1

Maximum start current

Ma ximum op er a ting cur rent
Averag e idle current

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

Manual, publication number 83329420.

+5 V +12 V

1.1A

1.08A

1.0A

1.4A

1.1A

0.57A

16 Cheetah 18LP FC Installation Guide, Rev. A

Installing the Cheetah 18LP FC drive

To install a Chee tah 18LP FC driv e, simpl y plug the drive directl y
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 25 lists the pin descriptions of the 40-pin FC­SCA.

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

• Providing adequate cooling

• Mounting the drive

• Formatting the drive

Providing adequate cooling

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
showing suggested air flow patterns.

The drive’s product manual (83329420) 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 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

o

C (30oC for the

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

Cheetah 18LP FC Installation Guide, Rev. A 17
Figur e 2 shows one design ap proach wit h one or more f ans 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.

Kü hlun g de s Systems

Die Gehäusekonstruktion muß eine ausreichende Kühlung des
Laufwerkes gewährlei sten. Die Umgeb ungstemperat ur darf m ax­imal 50

Die Produkthandbuch Cheetah 18LP FC (Dokument 83329420)
enthalten Anweisungen zur Beurteilung der Luftstromkonstruk­tion. Die Beurteilung muß sicherstellen, daß sich die Gehäuse-

o

C betragen (30oC für der MTBF).

temperatur 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 hi nten nach vorne v erl aufen.

18 Cheetah 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
in reverse direction (side to side)

Under unit

Figure 2: Suggested air flow
Abbil dung 2. Empfohlener Luftstr om verlauf

Cheetah 18LP FC Installation Guide, Rev. A 19

Mounting the drive

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

You may mount the drive in any orientation (horizontally, verti­cally, or any combin ation ther eof ); howev er, y ou must ensure tha t
the drive receives adequ ate air flow f or cooli ng.

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 bo tt om of the drive. See
Figur e 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 Laufwerkes

Beacht en Sie beim Handhaben und Anfassen der Anschlußstift e
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 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 Cheetah 18LP FC Installation Guide, Rev. A
Unter seite des La ufwerkes weist vier weitere Befest igungslöche r

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.

Cheetah 18LP FC Installation Guide, Rev. A 21
.

K

-Z-T//

S

HL

[1]

J

B

-Z-

R

-Z- -X-N

A

-Z-

M

-X-

U

P

[1]

G

F

Notes:

Mounting holes are 6-32 UNC 2B, three

[1]

on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 6.0 in-lb (3.32 nm)
with minimum full thread engagement of

0.12 in. (3.05 mm).

Dimension Table

M
R

U

Inches

A

1.028

B

5.787

C

4.000

D

3.750

E

0.125

F

1.750

G

1.625

H

1.122

J

4.000

K

0.250

L

1.638

0.181

P

1.625

1.618

S

0.276

T

.015
.015

max
max

± .010
± .010
± .010
± .010
± .020
± .020
± .010
± .010
± .010
± .020
± .020
± .003
± .040

max
max

Millimeters

26.10

147.00

101.60

92.25

3.18

44.45

41.28

28.50

101.60

6.35

41.60

4.60

41.28

41.10

7.00

0.38

0.38

max
max

± .25
± .25
± .25
± .25
± .50
± .50
± .25
± .25
± .25
± .50
± .50
± .08
± 1.02

max
max

Figure 3: Dimensions
Abbil dung 3: Lauf werkabmessungen

DE

C

-X-

22 Cheetah 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 drive 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 al l user dat a. 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).

Note.

Seagate is not responsible for lost user data.

1. Supply DC power to the driv e (power is supplied to the driv e

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
sele cting and f ormatt ing the drive.

Cheetah 18LP FC Installation Guide, Rev. A 23

Enabling and disabling the write cache

Write caching is a feature that allows the dr ive 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 actually been physically

written t o the disc.
OEM drives are shipped with write cache enabled by default. If
you want to disable the write cache, refer to your system’s dr ive
controller and software utility documentation. Seagate provides
an ASPI utility that you can use in a PC compatible system to
disa ble the write cache. I t i s availa ble on Seagate’s CompuServe
forum and on the Seagate BBS (refer to “Seagate Technology
support services” on page 8).

Connecting remote 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 lights up when the
drive is active (reading or wri ting), connect the LED’s anode con­nector to J6 pin 11 and the cathode, through an appropriate
external current-lim iting resistor, to J6 pin 8 or pin 12.

24 Cheetah 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 wi th this LED driv er.

Connect the minus side of an external high-efficiency LED (i.e. 2ma)
to this pin. Connect the plus side of the LED to +5V.

[2] An external current limiting res istor is required when connecting an

LED to this pin. The minus side of the resistor/LED combination is
connected to this pin. Connect the plus side to +5V. This pin con­nects in parallel with the signal of the same name in the J1 interface
connector.

[3] Ju m per stora ge location is ac ross pins 2 and 4 (horizontally) .

Figur e 4: LED indicator connector (J6)

Cheetah 18LP FC Installation Guide, Rev. A 25

Table 1: FC-SCA pin descriptions

Pin/contact Signal name Signal type

1* –EN bypass port A TTL output
2* 12 Volts
3* 12 Volts
4* 12 Volts
5* –Parallel ES I
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 LE D out Open collector out
17* Reserved N C
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

26 Cheetah 18LP FC Installation Guide, Rev. A

Pin/contact Signal name Signal type

26 Ground
27* +P o rt 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 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.

Cheetah 18LP FC Installation Guide, Rev. A 27

Troubleshooting

Before calling Seagate Technical Support, please read the pos­sibilities discussed below. The suggestions presented here will
resol ve the majority of instal lation problems.

General installation troubleshooting

•

Ch eck s y ste m co m pat ib il it y.

This is a Fibre Channel (FC)
device. Check your system documentation to ensure that it
supports FC devi ces.

•

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 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 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.

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.

All device options,

Seagate Technol ogy, I nc.
920 Disc Dri ve, Scot ts Valle y, CA 9 5066-4544, USA

Publ ication Number: 83329430, Rev. A, Printed in USA