••••••••••••••••••••••
Cheetah 4LP FC
••••••••••••••••••••••
Fibre Channel
••••••••••••••••••••••
Disc Drive
••••••••••••••••••••••
ST34501FC
••••••••••••••••••••••
Installation Guide
••••••••••••••••••••••
Contents
Preface........................................................................................ 1
Electrostatic discharge protectio n........... ..... ...... ..... ...... ...... ........ 1
Important safety information and precautions.............................2
Wichtige Sicherheitshinweise......................................................4
Regulatory agency compliance...................................................8
Seagate technical support services .......................................... 10
General description................................................................... 15
Installing the Cheetah 4LP FC drive.......................................... 17
Kühlung des Systems.............................. ..... ...... ..... .................. 18
Troub l eshooting................................. ...... ..... ...... .......................27
©1996, 1997 Seagate Technology, Inc. All rights reserved
Publication Number: 83329180, Rev. B
September 1997
Seagate, Seagate Technology, and the Seagate logo are registered trademarks of Seagate Technology, Inc. Cheetah, SeaFAX,
SeaFONE, SeaNET, SeaTDD, and SeaBOARD 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 4LP FC Installation Guide, Rev. B 1
Preface
This manual contains information for users of Seagate Cheetah
4LP FC (Fibre Channel interface) disc drives. It provides techni-
cal support information, performance specifications, installation
instructions, and a troubleshooting section. Additional informa-
tion is available in the Cheetah 4LP FC Product Manual (part
number 83329190). Contact your Seagate sales representative
if you need to order this publication.
Electrostatic discharge protection
Caution. Removal o f c irc uit bo ards by personnel not pe rform-
ing depot repair will damage components and may
void the warranty.
All drive electronic assemblies are sensitive to static electricity,
due to the electrostatically sensitive devices used within the
drive circuitry. Although some devices such as metal-oxide
semiconductors are extremely sensitive, all semiconductors, as
well as some resistors and capacitors, may be damaged or
degraded by exposure to static electricity.
Electrostatic damage to electronic devices may be caused by
the direct discharge of a charged conductor or by exposure to
the static fields surrounding charged objects. To avoid damaging
drive electronic assemblies, observe the following precautions
when installing or servicing the drive:
• Ground yourself to the drive whenever the drive electronics
are or will be exposed. Connect yourself to ground with a
wrist strap (Seagate part number 12263496). Connection
may be made to any grounded metal assembly. As a general rule, reme mber th at you an d the dr ive elect ronic s must
2 Cheetah 4LP FC Installation Guide, Rev. B
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 elec tricity from th e carrier or tray pr ior to inser ting it
into the system.
Important safety information and precautions
Caution.
Use proper safety and repair techniques for safe, reliable operation of this unit. Service should be done only by qualified persons. We recommend the procedures in this manual as effective
ways of servicing the unit. Some procedures require the use of
special tools. For proper maintenance and safety, you must use
these tools as recommended.
The procedures in this manual and labels on the unit contain
warnings and cautions that must be carefully read and followed
to minimize or eliminate the ris k of personal injury. The warnings
point out conditions or practices that may endanger you or others. The cautions point out conditions or practices that may damage the unit, possibly making it unsafe for use.
These warnings and cautions are not exhaustive. We cannot
possibly know, evaluate, and advi se you o f all the ways in whi ch
maintenance might be performed or the possible risk of each
technique. Consequently, we have not completed any such
broad evaluation. If you use a non-approved procedure or tool,
Use forced-air ventilation when bench-testing the
drive to ensure proper cooling of drive components.
Cheetah 4LP FC Installation Guide, Rev. B 3
first ensure that the method you choose will not risk either your
safety or unit performance.
Always observe the following warnings and precautions:
• Perform al l mainten ance by following th e proced ures in this
manual.
• Follow all cautions and warnings in the procedures.
• Use sound safety practices when operating or repairing the
unit.
• Use caution when tr oubleshooting a un it that has voltages
present. Turn off power to the unit before servicing it.
• Wear safety shoes when removing or replacing heavy parts.
• E nsure that the inter nal te mperature o f 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 s tacked vertica lly, pay special at tention to the top
where temperatures are usually highest.
• Follow the precautions listed above in “Electrostatic discharge protection.”
• Do not remove any circuit boards from the drive chassis.
Return t he ent i re drive for depot repa ir i f a ny cir c ui t bo ard is
defective. Removal of circuit boards by personnel not performing depot repair will damage components and may void
the warranty.
As a component, the drive is designed to be installed and operated in accordance with UL1950, IEC950, CSA C22.2 950-M89,
and VDE0805 and EN60950.
Seagate takes all reasonable ste ps to ensure that its products
are certifiable to currently accepted standards.
4 Cheetah 4LP FC Installation Guide, Rev. B
Typical applications of these disc drives include customer pack-
aging 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 d esigners are respons ible for meeting these con ditions of acceptability in obtaining safety-regulatory agency compliance in their end-use products and for certifying where
required by law. A necessary part of meeting safety requirements is the provision for overcurrent protection on drive SELV
supply voltages.
This unit is a compon ent part and as s uch i s no t meant t o c omply
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
Laufwerkkomponenten sicherzustellen.
Verwenden Sie geeignete Sicherheits- und Reparaturverfahren,
um den sicheren, zuverlässigen Betrieb dieser Einheit zu
gewährleist en. Reparat uren dürfen nur von qualifizie rtem Fachpersonal vorgenommen werden. Wir empfehlen die Verfahren in
diesem Handbuch als effektive Methoden zur Wartung und Reparatur der Einheit. Einige Verfahren erfordern Spezialwerkzeuge; diese müssen zur sachgemäßen Ausführung der
Wartungsarbeiten und aus Sicherheitsgründen den Empfehlungen entsprechend verwendet werden.
Beim Testen des Laufwerks auf dem Prüftisch ist
Cheetah 4LP FC Installation Guide, Rev. B 5
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 vermeide n. Die Warnhinweis e machen auf Situa tionen
oder Praktiken aufmerksam, die Sie oder andere gefährden
könnten. Die Vorsichtshinweise machen auf Situationen oder
Praktiken aufmerksam, die die Einheit beschädigen können, so
daß deren Gebrauch mit Risiko behaftet ist.
Die Warn- und Vorsichtshinweise sind nicht allumfassend! Es ist
uns einfach nicht möglich, alle Wartungsmethoden oder die
eventuellen Risiken jeder Methode zu kennen, zu beurteilen und
Sie entsprechend zu beraten. Aus diesem Grund haben wir auf
eine derartige umfassende Beurteilung verzichtet. Falls Sie ein
hier nicht beschriebenes Verfahren oder Werkzeug verwenden,
stellen Sie zuerst sicher, daß das gewählte Verfahren weder Ihre
persönliche Sicherheit noch die Leistung der Einheit gefährdet.
Beachten Sie in jedem Fall die folgenden Warn-und Vorsichtshinweise:
• Führen Sie alle Wartungsarbeiten entsprechend den
Anweisungen in diesem Handbuch aus.
• B eachten Sie alle War n- und Vorsichtsh inweise in diesem
Handbuch.
• Treffen Sie beim Betrieb oder bei der Reparatur 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 Reparaturarbeiten beginnen.
6 Cheetah 4LP FC Installation Guide, Rev. B
• Tragen Sie Sicherheitsschuhe, wenn Sie schwere Teile
aus- bzw. einbauen.
• Wenn das Laufwerk in einem Einbaugestell oder Gehäuse
montiert ist, sorgen Sie dafür, daß die Temperatur im
Inneren des Gestells oder Gehäuses die für das Laufwerk
vorgegeben en Gr en zwerte nicht übersteigt. W e nn E inh eite n
vertikal übereinander betestigt werden, achten Sie
besonders auf den oberen Stapelbereich, da dort die Temperatur gewöhnlich am höchsten ist.
• Befolgen Sie die oben unter “Electrostatic Discharge Protection” angegebenen Sicherheitsmaßnahmen.
• Nehmen Sie keine Platinen aus dem Laufwerkgehäuse.
Wenn eine Plati ne defekt ist, muß das gesamte Laufwerk
zur Reparatur eingeschickt werden. Die Herausnahme von
Platinen durch anderePersonen als die für die werkseitige
Reparatur zuständigen kann zu einer Beschädigung der
Komponenten und Erlöschen des Garantieanspruchs
führen.
• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht
aus dem Laufwerkgehäuse nehmen! Falls die HDA beschädigt ist, schicken Sie das gesamte Laufwerk zur Reparatur
ein.
• Die HDA ist nicht vor Ort reparierbar und darf nicht auseinandergenommen werden! Öffnen der versiegelten HDA
durch andere Personen als die für die werkseitige Reparatur zuständigen hat eine Beschädigung der Komponenten
und Erlöschen des Garantieanspruchs zur Folge.
Cheetah 4LP FC Installation Guide, Rev. B 7
Als Teilkomponente ist dieses Laufwerk für die Installation und
den Betrieb in Übereinstimmung mit UL 1950, IEC950,
EN60950, CSA C22.2 950 und VDE0805 vorgesehen.
Seagate ist ständig bemüht, die Zulassungsfähigkeit von
Seagate-Produkten im Rahmen der gegenwärtig geltenden
Standards zu gewährleisten. Zu den typischen Anwendungen
dieser Festplattenwerke zählen Systemeinbau durch den
Kunden und die Konstruktion von Untersystemen. Sicherheitsbehörden gewähren eine bedingte Zulassung für Komponenten
wie das Cheetah-Festplattenlaufwerk vorbehaltlich der endgültigen Zulasssung im Endprodukt. Designer von Untersystemen
sind dafür verantwortlich, die Voraussetzungen für die Einhaltung sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren
Endprodukten und - falls gesetzlich vorgeschrieben - für die
Zulassung zu schaffen. Eine Grundvoraussetzung zur Einhaltung der Sicherheitsanforderungen ist die Bereitstellung eines
Überlastschutzes für die SELV-Versorgungsspannungen des
Laufwerks.
Dieses Gerät ist eine Baugruppe und unterliegt als solche nicht
den Anforderungen der FCC od er äh nl ich er na tio nal er Beh örde n
für eigenständige Geräte. Technische Testergebnisse zu elektromagnetische Strahlung sind für Designer von Untersystemen
auf Anfrage von der Seagate-Sicherheitsabteilung erhältlich.
8 Cheetah 4LP FC Installation Guide, Rev. B
Regulatory agency compliance
Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any
susceptibility perf ormance requirem ents . It is the respon sibil ity of
those inte grating the d rive wit hin t heir s yste ms to perfor m thos e
tests required and design their system to ensure that equipment
operating in the same system as the drive or external to the system does not adversely affect the performance of the drive. See
DC power requirements on page 16.
Electromagnetic compliance
Seagate uses an independent laboratory to confirm compliance
to the directives/standard(s) for CE Marking and C-Tick Marking.
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, Pentium, and PowerPC microprocessors
• 3.5-inch floppy disc drive
• Keyboard
• Monitor/display
•Printer
• External modem
•Mouse
Although the test system with this Seagate model complies to
the directives/standard(s), we cannot guarantee that all systems
will comply. The computer manufacturer or system integrator
shall confirm EMC compliance and provide CE Marking and CTick Marking for their product.
Cheetah 4LP FC Installation Guide, Rev. B 9
Electromagnetic compliance for the European Union
If this model has the CE Marking it complies with the European
Union requirements of the Electromagnetic Compatibility Directive 89/336/EEC of 03 May 1989 as amended by Directive 92/
31/EEC of 28 April 1992 and Directive 93/68/EEC of 22 July
1993.
Australian C-Tick
If this model has the C-Tick Marking it complies with the Australia/New Zealand Standard AS/NZS3548 1995 and meets the
Electromagnetic Compatibility (EMC) Framework requirements
of Australia’s Spectrum Management Agency (SMA).
10 Cheetah 4LP FC Installation Guide, Rev. B
Seagate technical support services
If you need assistance installing your drive, consult your dealer.
Dealers are familiar with their unique system configurations and
can help you wit h system confli cts and other techni cal issu es. If
you need additional assistance with your Seagate
other Seagate products, use one of the Seagate technical support services listed below.
SeaFONE® 1-800-SEAGATE
Seagate’s 800 number (1-800-732-4283) allows toll-free access
to automated self-help services, providing answers to commonly
asked questions, troubleshooting tips, and specifications for disc
drives and t ape drives. This s ervice is available 24 hours daily
and requires a touch-tone phone. International callers can reach
this automated self-help service by dialing 408-456-4496.
Online services
Using a modem, you can obtain troubleshooting tips, free utility
programs, drive specifications and jumper settings for Seagate’s
entire product line. You can also download software for installing
and analyzing your drive.
SeaNET ™
You can obtain technical information about Seagate products
over the Internet from Seagate’s World Wide Web home page
(http://www.seagate.com) or Seagate’s ftp server (ftp://
ftp.seagate .c om). You can also send E-mail wit h your ques -
tions to DiscSupport @ Seagate .com or TapeSupport @
Seagate. com.
®
drive or
Cheetah 4LP FC Installation Guide, Rev. B 11
Seagate CompuServe forum
Online technical support for Seagate products is available on
CompuServe. To access our technical support forum, type
seagate
. This forum provi des information similar to that f oun d on
go
SeaBOARD. In addition, you can type questions or browse
through previous questions and answers on the forum messages.
SeaBOARD®
SeaBOARD is a computer bulletin board system that contains
information about Seagate disc and tape drive products and is
available 24 hours daily. Set your communications software to
eight data bits, no parity, and one stop bit (8-N-1).
Location Phone number
Australia 61-2-9756-2359
England 44-1628-478011
France 33 1-48 25 35 95
Germany 49-89-140-9331
Singapore TBA
Taiwan 886-2-719-6075
Thailand 662-531-8111
USA Disc: 405-936-1600; Tape: 405-936-1630
12 Cheetah 4LP FC Installation Guide, Rev. B
FAX services
SeaFAX®
You can use a touch-tone telephone to access Seagate’s automated FAX system to receive technical support information by
return FAX. This service is available 24 hours daily.
Location Phone number
Australia 61-2-9756-5170
England 44-1628-894084
USA 1-800-SEAGATE or 408-456-4496
Seagate technical support FAX
You can FAX questions or comments to technical support specialists 24 hours daily. Responses are sent during business
hours.
Location Phone number
Australia 61-2-9725-4052
England 44-1628-890660
France 33 1-46 04 42 50
Germany 49-89-1430-5100
Hong Kong 852-2368 7173
Japan 81-3-5462-2979
Korea 82-2-556-7294/4251
Singapore 65-488-7528
Taiwan 886-2-715-2923
USA Disc: 405-936-1685; Tape: 405-936-1683
Cheetah 4LP FC Installation Guide, Rev. B 13
Direct-support services
Seagate technical support
For one-on-one help, you can talk to a technical support specialist during local business hours. Before calling, note your system
xxxx
configuration and drive model number (ST
Location Phone number
Australi a 61-2-9725-3366 (9:00
England 44-1628-894083 (10:00
2:00
P.M
to 5:00
.
France 33 1-41 86 10 86 (9:30
P.M
to 5:00
.
2:00
P.M
P.M
A.M
A.M
, M–F)
.
A.M
, M–F)
.
Germany Disc: 49-89-140-9332; Tape: 49-89-140-9333
(9:30
A.M
to 12:30
.
P.M
, 2:00
.
M–F)
Hong Kong 852-2368 9918
Korea 82-2-556-8241
Singapore 65-488-7584 (9:00
to 5:00
P.M
, M–F)
.
A.M
to 12:00
.
Taiwan 886-2-514-2237
USA Please dial 1-800-SEAGATE or 408-456-4496
for the specific product telephone number.
(8:00
A.M
to 1:15
.
P.M
, 2:30
.
Central time, M–F)
SeaTDD™ 405-936-1687
Using a telecommunications device for the deaf (TDD), you can
send questions or comments 24 hours daily and exchange messages with a technical support specialist between 8:00
P.M. and 2:30 P.M. to 7:00
1:15
P.M
.
through Friday.
).
to 5:00
.
to 1:00
.
to 12:30
.
P.M
P.M
P.M
P.M
P.M
to 4:00
.
, 2:00
.
P.M
to 7:00
.
, M–F)
.
,
.
,
.
P.M
P.M
P.M
A.M
,
.
.
,
.
to
.
(Central time) Monday
14 Cheetah 4LP FC Installation Guide, Rev. B
Customer service centers
Seagate direc t OEM, Distribution , and Systems Integrat or customers should contact their Seagate service representative for
warranty information. Other custom ers sho uld co ntact th eir plac e
of purchase. Seagate offers comprehensive customer support
for all Seagate drives. These services are available worldwide.
Location Phone number FAX number
Asia Pacific and Australia 65-485-3595 65-485-4980
Europe, Middle East,
and Africa 31-2031-67300 31-2065-34320
Japan 81-3-5462-2904 81-3-5462-2979
USA 1-800-468-3472 405-949-6740
Other Americas (Brazil,
Canada, Mexi co) 405-949-6706 405-949-6738
Manufacturer’s representatives
Brazil
MA Informatica 55-11-810-7794 55-21-253-6467
Canada
Memofix
Adtech
Mexico
Abicom Seamax
SA DE CV 525-546-6965 525-546-4888
905-660-4936
905-812-8099
1-800-624-9857
905-660-8738
905-812-7807
Cheetah 4LP FC Installation Guide, Rev. B 15
General description
Cheetah 4LP 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 Cheetah
4LP FC Product Manual (part number 83329190) contains
guidelines for a properly designed enclosure.
Figure 1: Cheetah 4LP FC disc drive
16 Cheetah 4LP FC Installation Guide, Rev. B
Characteristics ST34501FC
Interface Fibre Channel Arbitrated Loop
Capacity
Unformatted (Gbytes)
Formatted (Gbytes)
Recording
Cylinders (user)
Read/write data heads
Servo heads (embedded)
Avg bytes/track
Access time
Average read (msec)
Average write (msec)
Disc rotation
RPM
Average latency (msec)
Data transfer rate
Maximum instantaneous
(Mbytes/sec)
DC power requirements (±5%)
Maximum start current
Maximum operating current
Average idle current
1. For more detailed power information, refer to the Cheetah 4LP FC Product Man-
ual, publication number 83329190.
1
5.59
4.52
6,526
8
0
115,078
7.7
8.7
10,033
2.99
106.3
+5 V
1.07A
1.08A
1.00A
+12 V
2.24A
1.08A
0.87A
Cheetah 4LP FC Installation Guide, Rev. B 17
Installing the Cheetah 4LP FC drive
To inst all a Ch eetah 4LP FC drive, simp ly plug the dr ive dir ectly
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 installed properly:
• Providing adequate cooling
• Mounting the drive
• Formatting the drive
Providing adequate cooling
The enclosure design must ensure adequate cooling for the
drive.
The drive’s product manual (83329190) 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
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.
18 Cheetah 4LP FC Installation Guide, Rev. B
Figure 2 shows on e desi gn appro ach w ith one or more f a ns use d
to generate ai r flow. The air-flow patter n 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 Systems
Die Gehäusekonstruktion muß eine ausreichende Kühlung des
Laufwerkes gewährleisten.
Die Produkthandbuch Cheetah 4LP FC (Dokument 83329190)
enthalten Anweisungen zur Beurteilung der Luftstromkonstruktion. Die Beurteilung muß sicherstellen, daß sich die Gehäusetemperatur bestimmter kritischer Komponenten bei
Laufwerkbetrieb innerhalb zugelassener Grenzen hält.Wir
empfehlen, das Laufwerk so zu orientieren oder den Luftstrom
so zu lenken, daß der geringste Luftstromwiderstand vonvorne
nach hinten oder von hinten nach vorne verlaufen.
Cheetah 4LP FC Installation Guide, Rev. B 19
Above unit
Under unit
Note. Air flows in the direction shown (front to back)
or in reverse direction (back to front)
Above unit
Note. Air flows in the direction shown or
in reverse direction (side to side)
Figure 2: Suggested air flow
Abbildung 2. Empfohlener Luftstromverlauf
Under unit
20 Cheetah 4LP FC Installation Guide, Rev. B
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.
Mount the drive to the host system’s chassis using four 6-32
UNC screws. Two mounting hole s are in each side of the drive
and there are f ou r mo unt ing holes in the bottom o f 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 beim Handhaben und Anfassen der Anschlußstifte
und Komponenten die Vorsichtsmaßnahmen zur Verhinderung
statischer Aufladung. Fassen Sie das Laufwerk nur am Rahmen
an.
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
Unterseite des Laufwerkes weist vie r we ite r e Befestigungsl öch er
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
Cheetah 4LP FC Installation Guide, Rev. B 21
Schraube nicht ohne Widerstand einschrauben läßt, sind die
Gewinde nicht korrekt aneinander ausgerichtet.
N
P
[1]
R
F
D
[2]
K
J
[4]
A
G
E
Notes:
Mounting holes three on each side, 6-32 UNC.
[1]
Max screw length into side of drive 0.15 in.
(3.81 mm). Screw tightening torque 6.0 in-lb
(.675 NM) max with minimum thread
engagement of 0.12 in. (3.05 mm).
Mounting holes four on bottom, 6-32 UNC.
B
[5]
H
S
[2]
Max screw length into bottom of drive 0.15 in.
(3.81 mm). Screw tightening torque 6.0 in-lb
(.675 NM) max with minimum thread
engagement of 0.12 in. (3.05 mm).
Power and interface connectors can extend
[3]
past the “A” dimension by 0.040 in. (1.02 mm).
Decorative front panel (optional).
[4]
Connector is centered on module ±0.020 in.
[5]
(.508 mm).
[3]
C
M
L
A
±
5.750
B
±
4.000
C
+
1.000
–
D
±
0.625
E
±
4.000
F
±
0.250
G
±
2.375
H
±
3.750
J
±
2.370
K
±
1.750
L
±
0.181
M
±
0.275
N
±
0.190
P
max
0.015
R
±
1.100
S
±
4.100
0.010
0.010
0.026
0.010
0.020
0.005
0.005
0.010
0.010
0.010
0.020
0.015
0.015
0.010
0.010
0.010
MillimetersInches
146.05
101.60
25.40
15.87
101.60
6.35
60.32
95.25
60.20
44.45
4.32
7.00
4.83
0.381
27.94
104.14
±
.25
±
.25
±
.38
±
.50
±
.13
±
.13
±
.25
±
.25
±
.25
±
.50
±
.38
±
.38
±
.25
max
±
.25
±
.25
Figure 3: Dimensions
Abbildung 3: Laufwerkabmessungen
22 Cheetah 4LP FC Installation Guide, Rev. B
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.
1. Supply DC power to the drive (power is supplied to the drive
through the 40-pin FC-SCA).
2. Format the disc drive. This drive 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 driv e erases all us er dat a. Be s ure th at
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).
Cheetah 4LP FC Installation Guide, Rev. B 23
Enabling write cache
Write caching is a feature that allows the drive to transfer write
data to its own c ac he, tell the controll er th at th e 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.
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 documentation. Seagate pro vid es an ASPI utility that y ou ca n use i n a
PC compatible system to e nable the wr ite cache. It is available
on Seagate’s CompuServe forum and on the Seagate BBS
(refer to “Seagate technical support services” on page10).
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 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 writing), c on nec t th e LED ’s anode connector to J6 pin 6 and the cathode to J6 pin 3.
24 Cheetah 4LP FC Installation Guide, Rev. B
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]
Pin 1
[1] The drive has a 2.2k ohm resistor 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.
[3] Jumper storage location is across pins 2 and 4 (horizontally).
Figure 4: LED indicator connector (J6)
Cheetah 4LP FC Installation Guide, Rev. B 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 TTl output
6* Ground
7* Active LED out Open collector out
8* Reserved
9* RMT_start TTL input
10* DLYD_start TTL input
11* –EN bypass port B TTL output
12* SEL_6 TTL input
13* SEL_5 TTL input
14* SEL_4 TTL input
15* SEL_3 TTL input
16* Fault LED out Open collector out
17* Reserved NC TTL input
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
(-DRV present)
26 Cheetah 4LP FC Installation Guide, Rev. B
Pin/contact Signal name Signal type
26 Ground
27* +Port B_in Diff. PECL input pair
28* –Port B_in
29 Ground
30* +Port A_out Diff. PECL output pair
31* –Port A_out
32 Ground
33* +Port B_out Diff. PECL output pair
34* –Port B_out
35 Ground
36 SEL_2 TTL input
37 SEL_1 TTL input
38 SEL_0 TTL input
39 Reserved NC
40 5 Volts charge
Cheetah 4LP FC Installation Guide, Rev. B 27
Troubleshooting
Before calling Seagate Technical Support, please read the possibilities discussed below. The suggestions presented here will
resolve the majority of installation problems.
General installation troubleshooting
• Check system compatibility. This is a Fibre Channel (FC)
device. Check your system documentation to ensure that it
supports FC devices.
• Check the physical attachment. Ensure that the drive is
properly mated with the backpanel Fibre Channel single
connector attachment (FC-SCA).
• Check to ensure that drive is receiving power. Insert the
drive into your system. Listen carefully for 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 fu nctioni ng
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. All device options,
including addresses, are set at the backpanel within the
host system or through system software. Check your host
system documentation about how to set these options in
your particular system.
Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 83329180, Rev. B, Printed in USA
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