seagate Cheetah 36FC installation Guide

••••••••••••••••••••••

Cheetah 36FC

••••••••••••••••••••••

Fibre Channel

••••••••••••••••••••••

Disc Drive

••••••••••••••••••••••

ST136403FC

••••••••••••••••••••••

Installation Guide

••••••••••••••••••••••

Contents

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

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

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

Wichti g e Sic h er h e i ts h in w ei se.... .. .......... .. ... .......... .. .......... .. ... ...... 4

Europea n U ni o n Co m p lia n c e ...... ... ......... ... .. .......... .. .......... ... .. .... 7

Seagate Technology supp o rt ser v ic e s ... .......... .. ... ......... ... ......... .. 8

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

Installing t he Cheetah 36FC drive............... .. ............................16

Kühlung de s Sy s te ms........... .. .......... .. ... .......... .. .......... .. ... ......... 17

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

©1999 Seagate Technology, Inc. All rights reserved
Publication Number: 83329470, Rev. A
May 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 publication may be reproduced in any form without

written permission from Seagate Technology, Inc.

Cheetah 36FC Installation Guide, Rev. A 1

Preface

This manual contains information for users of Seagate Cheetah

36FC (Fibre Channel interface) disc drives. It provides technical

support information, performance specifications, installation

instructions, and a troubleshooting section. Additional informa-

tion is av ailable in the Cheetah 36FC Product Manual (part num-

ber 83329460). Cont act your Seagate sales repr esentative if you

need to order this publication.

Electrostatic discharge protection

Caution.

All drive electronic assemblies are sensitive to static electricity,

due to the electrostatically sensitive devices used within the

drive circuitry. Although some devices such as metal -oxide semi -

conductors are extremely sensitive, all semiconductors, as well

as some resistors and capacitors, may be damaged or degraded

by ex posure to static elec tricity.

Electrost atic damage t o electroni c 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 t he 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

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

2 Cheetah 36FC Installati on G uide, 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.

Important safety information and precautions

Caution.

Use proper safety techniques for safe, reliable operation of this
unit.

The procedures in this manual and labels on the unit contain
warnings and cautions that must be carefully read and followed
to minimize or elimi nate 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, poss ibly making it unsafe for use.

Always observe the foll owing warnings and precautions:

• Follow all cautions and warnings in the procedures.

• Use sound safety practices when operating, installing, or

removing the unit.

• Use caution when troubleshooting a unit that has voltages

present. Turn off power to the unit before removing it.

• Ensure that the internal temperature of the rack or cabinet

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

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

Cheetah 36FC Installation Guide, Rev. A 3

peratures are usually 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-

able. I f the sealed HD A is opened by personn el not performing
depot repair, this will damage components and void the war-

ranty.
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 certify component
assemblies, such as the Cheetah disc drive, based on their final
acceptability in the end-use product. The subsystem designers
are responsible for meeting these conditions of acceptability in
obtaining safety-regulatory agency compliance in their end-use
products and for cer tifying where required by law. A necessary
part of meeting safety requirements is the provision for overcur­rent protection on drive SELV supply voltages.

4 Cheetah 36FC Installati on G uide, 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 Department to assist the subsystem
designer.

Wichtige Sicherheitshinweise

Vorsicht.

Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der
Laufwerkkom ponenten 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 Risiko behaft et i st.

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 Verfa hren weder Ihre
persönliche Sicherheit noch die Leistung der Einheit gefährdet.

Beim Testen des Laufwerks auf dem Prüftisch ist

Cheetah 36FC 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 Sicherheitsvorkehrun-

gen.

• Wenn eine Einheit unter Spannung steht, gehen Sie bei der

Fehlerdiagnose besonders vorsichtig vor. Schalten Sie die

Einheit au s, bevor Sie m it den Installations-und Entfernungsar -

beiten beginne n.

• Wenn das Laufwerk in einem Einbaugestell oder Gehäuse

montiert ist, sorgen Sie dafür, d aß die Temperatur im Inneren

des Gestells oder Gehäuses die für das Laufwerk vorgege-

benen Grenzwerte nicht übersteigt. Wenn Einheiten vertikal

übereinander betestigt werden, achten Sie besonders auf den

oberen Stapelbereich, da dort die Temperatur gewöhnlich am

höchsten ist.

• Befolgen Sie die oben unter “Electrostatic Discharge Protec-

tion” 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 Per sonen 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 nehme n! Falls die HDA besch ädi gt i st, schicken

Sie das gesamte Laufwerk zur Reparatur ein.

6 Cheetah 36FC Installati on G uide, Rev. A

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

dergenommen werden! Öffnen der versiegelten HDA durch

andere Per sonen als die für die werkseitige Reparatur zustän-

digen hat eine Beschädigung der Komponenten und

Erlöschen des Garantieanspruchs zur Fo lge.
Als Teilkomponente ist diese s Laufwe rk für di e Insta llation und

den Betrieb in Übereinsti mmung mit UL 1950, EN60 950,
CAN\CSA C22.2 950-95 und VDE0805 vorgesehen.

Seagate ist ständi g bemüht, die Zulassungsfähigkeit von
Seagate-P rodukten im Rahme n der geg enwär tig ge ltenden
Standa rd s zu gewährleisten. Zu den typischen Anwendungen
dieser Festplattenwerke zählen Systemeinbau durch den
Kunden und die K on strukti on von Unter systemen. Sicherh eitsbe ­hörden gewähren eine bedingt e Zulass ung für Komponenten wie
das Cheetah-Festplattenlauf werk vorbehaltlich der endgültigen
Zulasssun g im E ndprod ukt . Design er von Un tersyst eme n sind
dafür verantwortlich, die Voraussetzungen für die Einhaltung
sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren
Endprodukten und - falls gesetzlich vorgeschrieben - für die
Zulass ung zu scha ffen. Eine Gr un dvorau ss etzu ng zur E in hal­tung der Sicherheitsanforderungen ist die Bereitstellung eines
Überlastschutzes für die SELV-Versorgungsspannungen des
Laufwerks.

Dieses Gerät ist eine Baugruppe und unterliegt als solche ni cht
den Anforderungen der FCC oder ähnlicher nationaler Beh örden
für eigenständige Geräte. Technische Testergebnisse zu elektro-
magnetische Str ahlung si nd für Designer von Unte rsyst emen auf
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.

Cheetah 36FC 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 Direc­tive 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-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 Management Agency (SM A).

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
configurations include:

• 486, P entium, and P owerPC Microprocessors

• 3.5-inch Flo ppy Disc Driv e

• 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 Cheetah 36FC Installati on G uide, Rev. A

Seagate Technology suppo rt services

Online Se r vices

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_presales.shtml
[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
availa ble worldwide.

:

is a computer bulletin board system that contains

or

DiscPresales@Seag ate.com

or

or

[e-mail]

or

[e-mail]

Automated S er vices

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 36FC 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

touch-tone phone, you can obtain technical support information
by retu rn FAX 24 hours daily. This service is available worldwi de.

®

is Seagate's automated FAX delivery system. Using a

Presales Support

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

Seagate Express

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

T e 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 additi onal help , you can talk to a Seagate technical support
specialist. Before calling, note your system configuration and
drive model number (ST

SeaTDD™([phone])

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

####).

is a telecommunications device

10 Cheetah 36FC Inst allation 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) Monda y through Friday.

Customer Service (C SO)

Warranty Repai r

Seagate offers worldwide customer support for Seagate drives.
Seagate direct OE M , Di stribution and Sys tem Integrator custom­ers should contact their Seagate service center representative
for warranty information. Other customers should contact their
place of purchase.

Authorized Service Centers

If you l ive outside the US, you can contact a n Authorized Servi ce
Cent e r for service or re pair.

USA/Canada/Latin America Support Services

Presales Support

Disc:

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

Tape:

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

Technical Suppor t (SeaFONE)

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

FAX:

Disc: +

1-405-936-1685;

SeaFAX 1-800-SEAGATE
SeaTDD [phone]
SeaBOARD

Disc: +

Tape:

[phone]

1-405-936-1600;

Tape:

[phone]

Cheetah 36FC Installation Guide, Rev. A 11

Warranty Repai r

USA 1-800-468-3472 FAX: [phone]
Mexico an d
Latin America [phone] F AX: [phone]

Authorized Service Centers

Brazil

MA Informatica

Canada

Memofix
Adtech

1

1

[phone] F AX: [phone]

[phone] F AX: [phone]
[phone] or F AX: [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
located in Amsterdam, The Netherlands.

Call Center

Austria 0 800-20 12 90
Belgium 0 800-74 876
Denmark 80 88 12 66
Fr ance 0 800-90 90 52
Germany 0 800- 182 6831

A.M

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

1.Authorized Service Centers

12 Cheetah 36FC Inst allation Guide, Rev. A
Ireland 1 800-55 21 22

Italy 1 677 90 695
Netherlands 0 800-732 4283
Norwa y 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
Turkey 00 800-31 92 91 40
United Kingdom 0 800-783 5177

SeaBOARD

Germany [phone]

Fax Services—All European Countries

Presales/Technical Supp ort/W arranty Repair [phone]

Africa/Middle East Support Services

For presales, technical support, warranty repair and FAX ser­vices in Af rica and the Middle Eas t, 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

Technical Suppor t

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

Cheetah 36FC Installation Guide, Rev. A 13
Singapore [phone] FAX: [phone]

Taiwan [phone] FAX: [phone]

SeaFAX

Australia [phone]

Warranty Repai r

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

Australia

14 Cheetah 36FC Inst allation Guide, Rev. A

General description

Cheetah 36FC 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
sufficientl y grounded and shielded fr om emissions. The Cheetah
36FC Product Manual (part number 83329460) contains guide­lines f or a properly designed enclos ure.

Figure 1: Cheetah 36FC disc drive

Cheetah 36FC Installation Guide, Rev. A 15

Characteristics ST136403FC

Interface Fibre Channel
Capacity

Unform atted (Gb ytes)
Formatted (Gbytes)

1

Recording

Cylinders (user )
Read/w rite data heads
Avg bytes/t ra ck

Access time

Average read (msec)
Average write (msec)

Disc rotation

RPM
Average latency (msec)

Data transfer rate

Maxi mu m instantaneous

(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.

DC power requirements(±5%)

Maximum start current

Maximum operating current
Average idle current

1. For more detailed power information, refer to the Cheetah 36FC Product Man-

ual, publication number 83329460.

1

43.2

36.4

9,801
24
153,28 4 to 229,045

6.15

6.85

10,016

2.99

106.3

ST136403FC

+5 V +12 V

1.12

1.13

1.03

2.24

1.39

0.99

16 Cheetah 36FC Inst allation Guide, Rev. A

Installing the Cheetah 36FC drive

To install a Cheetah 36FC drive, simply plug the drive directly
into your system’s Fibre Channel backpanel 40-pin single con-
nector 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 installed properly:

• Providing adequate cooling

• Mounting the drive

• Formatting t he drive

Providing adeq uate 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 (83329460) describes how to evalu-
ate 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
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 dr ive and by other nearby
heat sources.

o

C (30oC for the

Cheetah 36FC Installation Guide, Rev. A 17
Figure 2 shows one design approach with one or m ore fan s 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 Syst ems

Die Gehäusekonstruktion muß eine ausreichende Kühlung des
Laufwerkes ge währlei sten. Die Umgebungstemperatur darf max-

o

imal 50
Die Produkthandbuch Cheetah 36FC (Dokument 83329460)

enthalten Anweisungen zur Beurteilung der Luftstromkonstruk­tion. Die Beurteilung muß sicherstellen, daß sich die Gehäuse-
temperatur bestimmter kritischer Komponenten bei
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.Wir
empfehlen, das Laufwerk so zu orientieren oder den Luftstrom
so zu lenken, daß der geringste Luftstromwiderstand vonvorne
nach hinten oder v on hinten nach vorne verlaufen.

C betragen (30oC für der MTBF).

18 Cheetah 36FC Inst allation Guide, Rev. A

Above unit

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

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

Figure 2: Suggested air flow
Abbildung 2. Empfohlener Luftstrom verl auf

Under unit

Above unit

Under unit

Cheetah 36FC 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 handle the drive by the frame only.

You may mount the drive in any orientation (horizontally, verti­cally, or any combination ther eof); however, you m ust ensur e that
the drive receives adequate air flow 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 mounting holes in the bo tt om 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 Laufwerkes

Beachten Sie bei m Han dhaben und Anfassen der Anschlußstifte
und Komponenten die Vorsichtsmaßnahmen zur Verhinderung
statischer Aufladung. Fassen Sie das Laufwerk nur am Rahmen
an.

Das Laufwerk kann in beliebiger Orientierung (horizontal, ver­tikal oder schräg) installiert werden; jedoch muß dafür gesorgt
werd en, daß ein ausreichender Luftstrom zur Kühlung des Lauf­werkes v orhanden 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 36FC Inst allation Guide, Rev. A
Unterseite des Laufwerkes weist vier wei tere Befe stigungslöcher

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 36FC Installation Guide, Rev. A 21

.

-Z-T//

S

HL

-Z- -X-N

A

-Z-

M

U

-X-

P

[1]

G

F

[1]

J

B

R

DE

C

-X-

Notes:

[1]

Figure 3: Dimensions
Abbildung 3: Laufwerkabm essungen

K

-Z-

Mounting holes are 6-32 UNC 2B, three
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).

1.654

A

5.787

B

4.000

C

3.750

D

0.125

E

1.750

F

1.625

G

1.122

H

4.000

J

0.250

K

1.638

L

0.181

M
N

1.625

P

1.618

R

0.315

S
T
U

Dimension Table

Inches

max
max

± .010
± .010
± .010
± .010
± .020
± .020
± .010
± .010
± .010
± .020

.040

max

± .020
± .003
± .040

.015

max

.015

max

Millimeters

42.01

147.00

101.60

92.25

3.18

44.45

41.28

28.50

101.60

6.35

41.60

4.60

1.20

41.28

41.10

7.00

0.38

0.38

max
max
± .25

± .25

± .25

± .25
± .50
± .50
± .25
± .25
± .25
± .50

max

± .50
± .08
± .10

max
max

22 Cheetah 36FC Inst allation 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.

Note.

1. Supply DC power to the drive (pow er is supplied to the drive

through 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.

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).

Seagate is not responsible for lost user data.

Cheetah 36FC Installation Guide, Rev. A 23

Enab l ing and disabling the writ e 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 com mand.

Warning.

OEM drives are shipped with write cache enabled by default. If
you want to disable 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
disable the write cache. It is available on Seagate’s web site
(refer to “Seagate Technology support services” on page 8).

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 to the disc.

Connecting 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 lights up when the
drive is a ctive (reading or writing), connect the LED’s anode con-
nector to J6 pin 11 and the cathode, through an appropriate
external cur rent-limiting resistor, to J6 pin 8 or pin 12.

24 Cheetah 36FC Inst allation Guide, Rev. A

Drive
Front

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 resist or in series with this LED driver.

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 resistor 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.

Pin 1

[3] Jumper storage location is acros s pins 2 and 4 (horizontally).

Figure 4: LED indicator connector (J6)

Cheetah 36FC 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 ESI
6* Ground
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 Open collector out
17* Res e rved NC
18* Reser ved 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

[1]

26 Cheetah 36FC Inst allation 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_ou t 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 Reserved 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 36FC Installation Guide, Rev. A 27

Troubleshooting

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

General installation troubleshoo t ing

Chec k sy ste m co m pa tib il it y.

•

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

Check the physical attachment.

•

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

Check to ensure that drive is receiving power.

•

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 driv e.

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.

This is a Fibre Channel (FC)

Ensure that the drive is

Insert the

All device options,

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

Publication Number: 83329470, Rev. A, Printed in USA