Seagate Cheetah 4LP User manual

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Cheetah 4LP
Disc Drive
ST34501N/W/WC/WD/DC
Installation Guide

Contents
Preface.........................................................................................1
Electrostatic discharge protection................................................2
Important safety information and precautions..............................3
Wichtige Sicherheitshinweise ......................................................5
Regulatory agency compliance....................................................8
Seagate technical support services...........................................10
General description....................................................................15
Initial setup information..............................................................20
Kühlung des Systems................................................................30
Installation des Laufwerkes und Anschluß der Kabel................32
N drives sectionb .......................................................................39
W/WD drives section..................................................................43
WC/DC drives section................................................................48
All drives (LED connections)......................................................50
©1996, 1997 Seagate Technology, Inc. All rights reserved
Publication Number: 83329110, Rev. B
September 1997
Seagate, Seagate Technology, and the Seagate logo are regis-
tered trademarks of Seagate Technology, Inc. Cheetah, SeaFAX,
SeaFONE, SeaNET, SeaTDD, and SeaBOARD are either trade-
marks or registered trademarks of Seagate Technology, Inc. or
one of its subsidiaries. All other trademarks or registered trade-
marks 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 Installation Guide, Rev. B 1
Preface
This manual contains information for users of the Seagate®
Cheetah 4LP SCSI disc drives. It provides support services, per-
formance specifications, and initial setup information. Additional
information is available in the
Cheetah 4LP Product Manual (part
number 83329120). Contact your Seagate sales representative
if you need to order this publication.
Attention. This high performance Cheetah disc drive MUST
have proper power and cooling considerations for
reliable operation.
Why is there a difference between 10,000 RPM and 7,200 RPM
disc drives?
• Cheetah disc drives spinning at 10,000 RPM will dissipate
more heat than 7,200 RPM class disc drives (typical power
dissipation is 22.5 watts).
• The increased heat is primarily due to increased motor power
dissipated inside the drive.
• The increase in heat dissipation requires that the Cheetah
10,000 RPM disc drives receive more cooling consideration
than 7,200 RPM class disc drives.
• Proper consideration of enhanced cooling by conduction (heat
transfer thru material) can reduce the convection cooling (heat
transfer by air motion) requirements.
Note. Please contact Seagate technical support services or
your distributor’s technical support if you have questions.

2 Cheetah 4LP Installation Guide, Rev. B
Electrostatic discharge protection
Caution. Removal of circuit boards by personnel not perform-
ing depot repair will damage components and may
void the warranty.
All drive electronic assemblies are sensitive to static electricity,
due to the electrostatically sensitive devices used within the
drive circuitry. Although some devices such as metal-oxide
semiconductors are extremely sensitive, all semiconductors, as
well as some resistors and capacitors, may be damaged or
degraded by exposure to static electricity.
Electrostatic damage to electronic devices may be caused by
the direct discharge of a charged conductor or by exposure to
the static fields surrounding charged objects. To avoid damaging
drive electronic assemblies, observe the following precautions
when installing or servicing the drive:
• Ground yourself to the drive whenever the drive electronics
are or will be exposed. Connect yourself to ground with a wrist
strap (Seagate part number 12263496). Connection may be
made to any grounded metal assembly. As a general rule,
remember that you and the drive electronics must all be
grounded to avoid potentially damaging static discharges.
• Turn off the power before removing or installing the DC power
cable.
• 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
carrier or tray prior to inserting it into the system.

Cheetah 4LP Installation Guide, Rev. B 3
Important safety information and precautions
Caution. Use forced-air ventilation when bench-testing the
drive to ensure proper cooling of drive components.
Use proper safety techniques for safe, reliable operation of this
unit.
The procedures in this manual and labels on the unit contain
warnings and cautions that must be carefully read and followed
to minimize or eliminate the risk of personal injury. The warnings
point out conditions or practices that may endanger you or oth-
ers. The cautions point out conditions or practices that may dam-
age the unit, possibly making it unsafe for use.
Always observe the following warnings and precautions:
• Follow all cautions and warnings in the procedures.
• Use sound safety practices when operating, installing, or
removing the unit.
• Use caution when troubleshooting a unit that has voltages
present. Turn off power to the unit before removing it.
• Ensure that the internal temperature of the rack or cabinet
does not exceed the limits defined for the drive when the drive
is mounted in an equipment rack or cabinet. When units are
stacked vertically, pay special attention to the top where tem-
peratures are usually highest.
• Follow the precautions listed above in “Electrostatic discharge
protection.”
• Do not remove any circuit boards from the drive. 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.

4 Cheetah 4LP Installation Guide, Rev. B
• Do not separate the head and disc assembly (HDA) from the
PCB. 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. If the sealed HDA is opened by personnel not performing
depot repair, this will damage components and void the
warranty.
As a component, this drive is designed to be installed and oper-
ated in accordance with UL1950, EN60950, CSA C22.2 950-
M89, and VDE0805.
Seagate takes all reasonable steps to ensure that its products
are certifiable to currently accepted standards. Typical applica-
tions of these disc drives include customer packaging and sub-
system 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 certifying where required by law. A necessary
part of meeting safety requirements is the provision for overcur-
rent protection on drive SELV supply voltages.
This unit is a component part and as such is not meant to comply
with FCC or similar national requirements as a stand-alone unit.
Engineering radiated emissions test results are available
through the Seagate Safety Department to assist the subsystem
designer.

Cheetah 4LP Installation Guide, Rev. B 5
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, zuver-
lässigen 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 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 Vorsicht-
shinweise:
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem
Handbuch.

6 Cheetah 4LP Installation Guide, Rev. B
• 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 aus, bevor Sie mit den Installations-und Entfernung-
sarbeiten beginnen.
• Wenn das Laufwerk in einem Einbaugestell oder Gehäuse
montiert ist, sorgen Sie dafür, daß die Temperatur im Inneren
des Gestells oder Gehäuses die für das Laufwerk 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 Personen als die für die werkseitige Reparatur zustän-
digen kann zu einer Beschädigung der Komponenten und
Erlöschen des Garantieanspruchs führen.
• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus
dem 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 auseinan-
dergenommen werden! Öffnen der versiegelten HDA durch
andere Personen als die für die werkseitige Reparatur zustän-

Cheetah 4LP Installation Guide, Rev. B 7
digen hat eine Beschädigung der Komponenten und
Erlöschen des Garantieanspruchs zur Folge.
Als Teilkomponente ist dieses Laufwerk für die Installation und
den Betrieb in Übereinstimmung mit UL 1950, EN60950, CSA
C22.2 950-M89 und VDE0805 vorgesehen.
Seagate ist ständig 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. Sicherheits-
behörden gewähren eine bedingte Zulassung für Komponenten
wie das Cheetah-Festplattenlaufwerk vorbehaltlich der endgülti-
gen Zulasssung im Endprodukt. Designer von Untersystemen
sind dafür verantwortlich, die Voraussetzungen für die Einhal-
tung sicherheits- oder aufsichtsbehördlicher Vorschriften in ihren
Endprodukten und - falls gesetzlich vorgeschrieben - für die
Zulassung zu schaffen. Eine Grundvoraussetzung zur Einhal-
tung 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 oder ähnlicher nationaler Behörden
für eigenständige Geräte. Technische Testergebnisse zu elek-
tromagnetische Strahlung sind für Designer von Untersystemen
auf Anfrage von der Seagate-Sicherheitsabteilung erhältlich.

8 Cheetah 4LP Installation Guide, Rev. B
Regulatory agency compliance
Electromagnetic susceptibility
As a component assembly, the drive is not required to meet any
susceptibility performance requirements. It is the responsibility of
those integrating the drive within their systems to perform those
tests required and design their system to ensure that equipment
operating in the same system as the drive or external to the sys-
tem does not adversely affect the performance of the drive. See
Table 2, DC power requirements.
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 appli-
cations. The selected system represents the most popular char-
acteristics 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 C-
Tick Marking for their product.

Cheetah 4LP 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 Direc-
tive 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 Austra-
lia/New Zealand Standard AS/NZS3548 1995 and meets the
Electromagnetic Compatibility (EMC) Framework requirements
of Australia’s Spectrum Management Agency (SMA).

10 Cheetah 4LP 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 with system conflicts and other technical issues. If
you need additional assistance with your Seagate®drive or
other Seagate products, use one of the Seagate technical sup-
port services listed below.
SeaFONE® 1-800-SEAGATE
Seagate’s 800 number (1-800-732-4283) allows toll-free access
to automated self-help services, providing answers to commonly
asked questions, troubleshooting tips, and specifications for disc
drives and tape drives. This service is available 24 hours daily
and requires a touch-tone 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.com). You can also send E-mail with your questions
to DiscSupport @ Seagate.com or TapeSupport @
Seagate.com.

Cheetah 4LP 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
go
seagate
. This forum provides information similar to that found on
SeaBOARD. In addition, you can type questions or browse
through previous questions and answers on the forum mes-
sages.
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 Installation Guide, Rev. B
FAX services
SeaFAX®
You can use a touch-tone telephone to access Seagate’s auto-
mated FAX system to receive technical support information by
return FAX. This service is available 24 hours daily.
Seagate technical support FAX
You can FAX questions or comments to technical support spe-
cialists 24 hours daily. Responses are sent during business
hours.
Location Phone number
Australia 61-2-9756-5170
England 44-1628-894084
USA 1-800-SEAGATE or 408-456-4496
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 Installation Guide, Rev. B 13
Direct-support services
Seagate technical support
For one-on-one help, you can talk to a technical support special-
ist during local business hours. Before calling, note your system
configuration and drive model number (ST
xxxx ).
SeaTDD™ 405-936-1687
Using a telecommunications device for the deaf (TDD), you can
send questions or comments 24 hours daily and exchange mes-
sages with a technical support specialist between 8:00 A.M.to
1:15 P.M. and 2:30 P.M. to 7:00 P.M.(Central time) Monday
through Friday.
Location Phone number
Australia 61-2-9725-3366 (9:00 A.M.to 5:00 P.M., M–F)
England 44-1628-894083 (10:00 A.M.to 1:00 P.M.,
2:00 P.M.to 5:00 P.M., M–F)
France 33 1-41 86 10 86 (9:30 A.M.to 12:30 P.M.,
2:00 P.M.to 5:00 P.M., M–F)
Germany Disc: 49-89-140-9332; Tape: 49-89-140-9333
(9:30 A.M.to 12:30 P.M., 2:00 P.M.to 4:00 P.M.,
M–F)
Hong Kong 852-2368 9918
Korea 82-2-556-8241
Singapore 65-488-7584 (9:00 A.M.to 12:00 P.M., 2:00 P.M.
to 5:00 P.M., M–F)
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 P.M.to 7:00 P.M.,
Central time, M–F)

14 Cheetah 4LP Installation Guide, Rev. B
Customer service centers
Seagate direct OEM, Distribution, and Systems Integrator cus-
tomers should contact their Seagate service representative for
warranty information. Other customers should contact their place
of purchase. Seagate offers comprehensive customer support
for all Seagate drives. These services are available worldwide.
Location Phone number FAX number
Asia Pacific and Australia 65-485-3595 65-485-4980
Europe, Middle East,
and Africa 31-2031-67300 31-2065-34320
Japan 81-3-5462-2904 81-3-5462-2979
USA 1-800-468-3472 405-949-6740
Other Americas (Brazil,
Canada, Mexico) 405-949-6706 405-949-6738
Manufacturer’s representatives
Brazil
MA Informatica 55-11-810-7794 55-21-253-6467
Canada
Memofix
Adtech 905-660-4936 905-812-8099
1-800-624-9857
905-660-8738
905-812-7807
Mexico
Abicom Seamax
SA DE CV 525-546-6965 525-546-4888

Cheetah 4LP Installation Guide, Rev. B 15
General description
Cheetah 4LP SCSI disc drives are high-speed, random-access
digital-data storage devices.
The drive is a component for installation in an enclosure
designed for the drive. This is often a rack within the system or
an external enclosure designed to house one or more disc drives
or other peripheral units. In either case, the disc drive must
receive adequate cooling (refer to “Providing adequate cooling”)
and it must be sufficiently grounded and shielded from emis-
sions. The
Cheetah 4LP Product Manual (part number
83329120) contains guidelines for a properly designed
enclosure.
*Model “N” version with 50-pin SCSI I/O connector
Figure 1. Cheetah 4LP family drive

16 Cheetah 4LP Installation Guide, Rev. B
Table 1. Drive characteristics
Characteristics of the various drives covered by this manual are
given in the following tables.
Interface type: SCSI Fast-20 (also called
Ultra SCSI1)
Cylinders (user accessable): 6,526
Disk rotation: 10,033 r/min ±0.5%
Avg. latency: 2.99 msec
Seek time2
Average read (typical) 7.7 msec
Average write (typical) 8.7 msec
Internal transfer rate 122 to 177 Mbits/sec
(variable with zone)
Multi-segmented cache 512 Kbytes
1Also operates per SCSI-1/SCSI-2/SCSI-3 protocols.
2Includes on-board controller overhead.

Cheetah 4LP Installation Guide, Rev. B 17
Table 1a. Additional drive characteristics
Legend for following table listing other drive characteristics:
A= capacity, unformatted, Gbytes
B= capacity, formatted, Gbytes1
C= number of read/write data heads
D= max. synchronous SCSI interface transfer rate, Mbytes/sec
1Standard OEM units formatted with 512 bytes per sector. The
drive is divided into six-cylinder-wide regions. Each region has
54 spares when formatted for 512-byte sectors.
Model ABCD
ST34501N 6,008 4,550 8 20
ST34501W 6,008 4,550 8 40
ST34501WC 6,008 4,550 8 40
ST34501WD 6,008 4,550 8 40
ST34501DC 6,008 4,550 8 40

18 Cheetah 4LP Installation Guide, Rev. B
Table 2. DC power requirements (Amps)
1Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
2A –10% tolerance is permissible during initial start of the spin-
dle but must return to ±5% before reaching 10,000 RPM. The
±5% must be maintained after the drive signifies that its
power-up sequence has been completed and that the drive is
able to accept selection by the host initiator.
3See the +12V current profile in the
Cheetah 4LP Product Man-
ual
(publication number 83329120).
4This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
ST34501
N, W, WC models WD, DC models
+5V8, 10 +12V8+5V8+12V8
Voltage regulation5± 5% ± 5%2± 5% ± 5%2
Max. start current
Peak DC 3, 6, 9 0.88 2.2 0.89 2.2
Delayed motor start
(max)1, 4 0.81 0.08 0.72 0.08
Peak operating current
Typical DC 1
Maximum DC1
Maximum (peak) AC7
0.85
0.9
1.0
0.89
0.94
1.98
1.05
1.09
—
0.89
0.94
1.98