Seagate ELITE 23 User manual

••••••••••••••••••••••••••
••••••••••••••••••••••••••
••••••••••••••••••••••••••
••••••••••••••••••••••••••
••••••••••••••••••••••••••
••••••••••••••••••••••••••
Elite 23
Disc Drive
ST423451N/W/WD
Installation Guide

Contents
Preface ........................................................................................1
Electrostatic discharge protection................................................1
Important safety information and precautions..............................2
Wichtige Sicherheitshinweise ......................................................4
European Union Compliance.......................................................6
Technical support services ..........................................................8
General description....................................................................12
Initial setup information..............................................................16
Kühlung des Systems................................................................25
Installation des Laufwerkes
und Anschluß der Kabel..........................................................27
N drives section.........................................................................34
W/WD drives section .................................................................38
All drives ....................................................................................42
©1996 Seagate Technology, Inc. All rights reserved
Publication Number: 83329130, Rev. A
September 1996
Seagate, Seagate Technology, and the Seagate logo are regis-
tered trademarks of Seagate Technology, Inc. Elite, SeaFAX,
SeaFONE, SeaNET, SeaTDD, and SeaBOARD are either trade-
marks or registered trademarks of Seagate Technology, Inc. All
other trademarks or registered trademarks are the propery of
their respective owners.
No part of this publication may be reproduced in any form without
written permission from Seagate Technology, Inc.

Elite 23 Installation Guide, Rev. A 1
Preface
This manual contains information for users of the Seagate®
ST423451 Elite 23 SCSI disc drives. It provides support ser-
vices, performance specifications, and initial setup information.
Additional information is available in the
Elite 23 Product Manual
(part number 83329140). Contact your Seagate sales represen-
tative if you need to order this publication.
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.

2 Elite 23 Installation Guide, Rev. A
• 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.
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.

Elite 23 Installation Guide, Rev. A 3
• 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.
• 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 Elite 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

4 Elite 23 Installation Guide, Rev. A
through the Seagate Safety Department to assist the subsystem
designer.
Wichtige Sicherheitshinweise
Vorsicht. Beim Testen des Laufwerks auf dem Prüftisch ist
Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der
Laufwerkkomponenten sicherzustellen.
Verwenden Sie geeignete Sicherheits- um den sicheren, 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:

Elite 23 Installation Guide, Rev. A 5
• 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 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 Laufwerkgehäuse. Wenn
eine Platine defekt ist, muß das gesamte Laufwerk zur Rep-
aratur 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 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-

6 Elite 23 Installation Guide, Rev. A
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 Elite-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 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.
European Union Compliance
If this model has the CE Marking, it complies with the European
Union requirements of the Electromagnetic Compatibility Direc-

Elite 23 Installation Guide, Rev. A 7
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.
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, Pentium, and PowerPC Microprocessors
• 3.5-inch Floppy Disc Drive
• Keyboard
• Monitor/Display
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 Elite 23 Installation Guide, Rev. A
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 support ser-
vices listed below.
SeaFONE at 1-800-SEAGATE (1-800-732-4283)
Seagate’s 800 number 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
touchtone phone. If you need to speak to a technical support
engineer, use this number to determine the correct access num-
ber to dial. (International callers may also reach this automated
self-help service by dialing 408-456-4496).
Seagate Technology 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
Seagate’s Internet connections—you can obtain technical infor-
mation on Seagate drives, Seagate software, and much more
over the Internet from Seagate’s World Wide Web home page
(http://www.seagate.com) or Seagate’s ftp server (ftp://ftp.
seagate.com).

Elite 23 Installation Guide, Rev. A 9
SeaBOARD
SeaBOARD is a computer bulletin board system that contains
information about Seagate Technology disc and tape drive prod-
ucts and is available 24 hours daily. Set your communications
software to eight data bits, no parity, and one stop bit (8-N-1).
SeaBOARD phone numbers are listed in the following table.
Seagate Technology Forum on CompuServe
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.
BBS Location Modem number
United States Disc: 408-434-1081;
Tape: 408-456-4415
England 44-1628-478011
France 33 1-48 25 35 95
Germany 49-89-140-9331
Singapore 65-292-6973
Thailand 662-531-8111
Australia 61-2-9756-2359
Taiwan 886-2-719-6075

10 Elite 23 Installation Guide, Rev. A
Seagate Technology 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 Telephone number
United States 1-800-SEAGATE or 408-456-4496
England 44-1628-894084
Australia 61-2-9756-5170
Location Fax number
United States 408-944-9120 (8:00 A.M.–5:00 P.M.
Pacific time, M–F)
England 44-1628-894089
France 33 1-48 25 28 61; 33 1-46 04 42 50
(9:00 A.M.–6:00 P.M., M–F)
Germany 49-89-149-8916-6
Australia 61-2-9725-4052
Singapore 65-293-4722
Hong Kong 852-2689-7173
Taiwan 886-2-715-2923
Korea 82-2-556-7294/4251

Elite 23 Installation Guide, Rev. A 11
Seagate technical support line
You can talk to a technical support specialist during business
hours Monday through Friday for one-on-one technical help.
Before calling, note your system configuration and drive model
number (ST
xxxx ). There are several technical support phone
numbers available for various Seagate products.
SeaTDD 408-944-9121
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 6:00 A.M. and
5:00 P.M.(Pacific time) Monday through Friday.
Location Telephone number
United States Please dial 1-800-SEAGATE for the
specific product telephone number.
(6:00 A.M.–5:00 P.M., M–F)
England 44-1628-894083
France 33 1-41 86 10 86 (9:30 A.M.–
12:30 P.M., 2:00 P.M.–5:00 P.M., M–F)
Germany Disc: 49-89-140-9332;
Tape: 49-89-140-9333
Australia 61-2-9725-3366
Singapore 65-290-3998
Hong Kong 852-2368 9918
Taiwan 886-2-514-2237
Korea 82-2-556-8241

12 Elite 23 Installation Guide, Rev. A
General description
Elite 23 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
Elite 23 Product Manual (part number 83329140)
contains guidelines for a properly designed enclosure.
Figure 1. Elite 23 disc drive
(N model shown)

Elite 23 Installation Guide, Rev. A 13
Table 1: Drive characteristics
Interface UltraSCSI1
Capacity
Unformatted 29.6 Gbytes
Formatted223.4 Gbytes
Recording
Cylinders (user) 6,880
Read/write data heads 28
Servo heads Embedded
Seek time (typical)3
Average read 13.2 msec
Average write 14.2 msec
Disc rotation
r/min 5,400 +0.5%
Average latency 5.55 msec
Internal transfer rate 85.9 to 123
(Mbits/sec, variable with zone)
Max sync. SCSI transfer rate
N 20 Mbytes/sec
W/WD 40 Mbytes/sec
Multi-segmented cache 2,048 Kbytes
1Can also be operated according to SCSI-1 and SCSI-2 proto-
cols.
2Standard factory units are formatted as follows:
512 data bytes per sector
6 cylinders per region
82 spares per region
3Not including on-board controller overhead.

14 Elite 23 Installation Guide, Rev. A
Table 2: DC power requirements
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 5400 r/min. 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
Elite 23 Product Manual
(publication number 83329140).
4This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
5See “Conducted noise immunity” in the
Elite 23 Product Man-
ual.
The specified voltage tolerance is inclusive of ripple,
noise, and transient response.
Single-ended Differential
+5V8,10
± 5% +12V8 ± 5%2+5V8,10 ± 5% +12V8 ± 5%2 Voltage regulation5
Amps
Maximum starting current
Peak DC 3, 6, 9 1.0 4.8 1.05 4.8
Delayed motor start (max)1, 4 .85 .1 .85 .1
Peak operating current
Typical DC1
Maximum (peak)7.98
1.1 1.6 2.8 1.2 1.95 1.6 2.8

Elite 23 Installation Guide, Rev. A 15
6At power-up, the motor current regulator limits the +12V cur-
rent to an average value of less than 4.8A, although instanta-
neous peaks may exceed this value. These peaks should
measure 5 msec duration or less.
7Minimum current loading for each supply voltage is not less
than 4% of the maximum operating current shown.
8Use separate ground returns for +5V and +12V supplies.
9Where power is provided to multiple drives from a common
supply, carefully consider individual-drive power requirements.
Where multiple units are powered on simultaneously, be sure
the peak starting current is available to each device.
10No terminator power. See 11.7.3.4 in the
Elite 23 Product
Manual.
Table 3: Dimensions of the drive
Typical Maximum
inches mm inches mm
Height 3.25 82.6 3.26 83.0
Width 5.75 146.1 5.76 146.3
Depth 8.0 203.0 8.01 203.5
Weight 7.0 pounds (15.5 kilograms)

16 Elite 23 Installation Guide, Rev. A
Initial setup information
The general information beginning on this page applies to all of
the Elite 23 drive models. After reading the general information
topics, refer to the appropriate drive-specific section listed below
for additional information about configuring and installing your
particular model.
Drive models Page
ST423451N 34
ST423451W ST423451WD 38
All drives (LED indicator connections) 42
General information
The following general information topics are discussed:
• SCSI ID jumpers
• Drive termination
• Terminator power
• Interface drivers and data path width notes
• Other applicable jumper options
• Providing adequate cooling
• Mounting the drive and connecting cables
• Formatting the drive

Elite 23 Installation Guide, Rev. A 17
SCSI ID jumpers
Each device on the SCSI chain must have a unique SCSI ID.
The host system’s SCSI controller usually uses the ID that has
the highest priority interrupt in the SCSI I/O system. This is
always ID7. ID0 is lowest priority in an 8-bit I/O system. ID8 is
lowest priority in a 16-bit I/O system. The lower priority SCSI IDs
are normally used for other SCSI devices such as this Elite disc
drive.
Note. Most SCSI controllers (host adapters) allow you to skip a
SCSI ID. For example, you can have ID0, ID1, and ID3
(skipping ID2). Other controllers do not allow this so be
sure to refer to your system or controller user’s manual
for details about its requirements for proper SCSI device
installation.
Note. This drive is a SCAM (SCSI Configured Auto Magically)
compliant drive. If the system into which you are installing
this drive requires SCAM compliant drives, you do not
need to be concerned about the drive ID jumper settings,
as the system automatically assigns your new drive the
ID it wants it to have. The system may or may not use the
existing drive ID jumper settings. Setting the drive ID
doesn’t hurt anything, but is not necessary in a SCAM
compliant system.
Most Elite 23 disc drives are factory set with the SCSI ID set at
0. To change the SCSI ID, refer to the appropriate drive section
for your model.
If, after completing the installation process, the drive’s LED does
not show on/off activity when the host is trying to communicate
with the drive, a duplicate SCSI ID may be the problem. If this is

18 Elite 23 Installation Guide, Rev. A
the case, change the ID so that each device on the SCSI chain
has its own unique ID. Also check your system or controller
user’s manual to ensure that you have not violated its SCSI ID
numbering recommendations.
Drive termination
If you are installing a Elite 23 drive in a system that has other
SCSI devices installed, terminate only the end devices on the
SCSI chain. A SCSI “device” is any disc drive, scanner, tape
backup unit, or other piece of hardware connected to your sys-
tem using the SCSI bus.
The top example in Figure 2 shows an internal hard disc at one
end of the SCSI bus with the SCSI controller at the other end
(both are terminated). The bottom example shows two additional
SCSI devices connected externally. This means the SCSI con-
troller is no longer on the end of the SCSI chain and should not
be terminated.
Note. Some controllers prefer to remain terminated even if they
are in the middle of the chain. Also, some controllers treat
the internal and external chains as separate logical
buses. This means you may need to terminate both the
first and last devices on both logical buses to achieve
proper termination. If necessary, refer to your system or
controller documentation to see how this is handled in
your particular system.