Seagate ELITE 23 Installation Manual

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Elite 23

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Disc D rive

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ST42345 1N/ W/WD

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Installation Guide

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Contents

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

Electro static discharge protection................... .............................1

Imp ortant safety informatio n and pre cautions ................ ..............2

Wichtige Sicherheitshinweise ......................................................4

European Union Complia nce.......................................................6

Technical support services.................................. ...................... ..8

General description ....... .............................................................12

Initial setup information......... ..... .......................... ........ ..... .........16

Kühlung des Systems................................................................25

Installati on 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
Publicatio n Number: 83329130, Rev. A
September 1996

Seagate, Seagate Technology, and the Seagate logo are regis-

tered trademarks of Seagate Technology, Inc. Elite, SeaFAX,
SeaFONE, Se aNET, SeaTDD, and SeaBOARD are either trade­marks 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, Re v. A 1

Preface

This manual contains information for users of the Seagate®
ST423451 Elite 23 SCSI disc drives. It provides support ser­vices, performance specifications, and initial setup information.
Additional information is available in the

Elite 23 Product Manual

(part number 83329140). Contact your S eagate sales represen­tative if you need to order this p ublication.

Electros tatic disch arge p rotecti on

Caution. Removal of circuit boards by personnel not perform-

ing depot repair will damage components and may
void the warranty.

All drive el ectronic assemblies ar e 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 gro und 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 Install ation Guide, Rev. A

• Turn off the power bef ore removing or installi n g the DC power
cable.

• Do not remove any circuit boards from the drive.

• Never use an ohmmeter on any cir cui t boards.

• When installing the drive on a carrier or tray, discharge the
carrier or tray prior to inserting it into the system.

Impo rtant safety inform ati on and precau tion s

Caution. Use forced-air ventilation when bench-testing the

drive to ensure pr oper 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 follow ed
to minimize or eliminat e the risk of personal injury. The warnings
point out conditio ns 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.

Always observe the following warnings and pre cautions:

• 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 w hen the drive
is mounted in an equipment rack or cabinet. When units are
stacked vertically, pay special attention to the top where tem­peratures are usually highest.

Elite 23 Installation Guide, Re v. A 3

• Follow the precautions listed above in “Electr ostatic discharge
prote ction.”

• 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 dam age components an d may void the warranty.

• Return the entire drive for depot re pair if the HDA is defective.

• Do not attempt to disassemble the HDA. It is n ot field repair­able. 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 i s d esigned to be installed an d oper­ated in accordance with UL1950, EN60950, CSA C22.2 950­M89, and VDE0805.

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 de sign. Safety agencies conditionally certi fy 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 requir ements is the provision for overcur­rent protection on drive SELV supply voltages.

This unit is a component part and as such is not meant to c omply
with FCC or similar national requirement s as a stand-alone unit.
Engineering radiated emissions test results are available

4 Elite 23 Install ation Guide, Rev. A
throu gh the Seagate Safety Department to a ssist the subsystem

designer.

Wichtige Sicherheitshinweise

Vorsicht. Beim Testen des Laufwerks auf dem Prüftisch ist

Fremdbelüftung vorzusehen, um eine ausreichende Kühlung der
Laufwerkkomponenten sicherzustellen.

Verwenden Sie geeignete Sicherheits- um den sicheren, zuver­lässigen Betrieb dieser Einheit zu gewährleisten.

Die Verfahren in diesem Handbuch und die Aufkleber auf dem
Gerät enthalten Warn- und Vorsichtshinweise. Diese Hinweise
sind sorgfältig durchzulesen und zu beachten, um das Risiko
von Verletzungen auf ein Mindestmaß zu beschränken oder
ganz zu vermeiden. Die Warnhinweise machen auf Situationen
oder Praktiken aufmerksam, die Sie oder andere gefährden
könnten. Die Vorsichtshinweise machen auf Situationen oder
Praktiken aufmerksam, die Einheit beschädigen können, so daß
deren Gebrauch mit Risiko behaftet ist.

Die Warn- und Vorsichts hinweise sind nicht allumfa ssend! Es ist
uns einfach nicht möglich, alle Wartungsmethoden oder die
eventuellen Risiken jeder Methode zu kennen, zu beurtei len 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 sich er, daß das gewählte Verfahren weder Ihre
persönliche Sicherheit no ch die Leistung der Einheit gefährdet.

Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht­shinweise:

Elite 23 Installation Guide, Re v. 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 Sicherheitsvorkehrun­gen.

• Wenn eine Einheit unter Spannung steht, gehen Sie bei der
Fehlerdiagnose besonders vorsichtig vor. Schalten Sie die
Einheit aus, bevor Sie mit den Installations-und Entfernung­sarbeiten beginnen.

• Wenn das Laufwerk in einem Einbaugestell oder Gehäuse
montiert i st, sorgen Sie dafür, daß die Temperatur im Inneren
des Gestells oder Gehäuses die für das Laufwerk vorgege­benen Grenzwerte nicht übersteigt. Wenn Einheiten vertikal
übereinander betestigt werden, achten Sie b esonders 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. We nn
eine Platine defekt ist, muß das gesamte Laufwerk zur Rep­aratur eingeschickt werden. Die Herausnahme von Platinen
durch andere Personen als die für die werkseitige Reparatur
zuständigen kann zu einer Beschädigung der Komponenten
und Erlöschen des Garantieanspruchs führen.

• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus
dem Laufwerkgehäuse nehmen! F alls die HDA beschädigt i st,
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 zustän-

6 Elite 23 Install ation Guide, Rev. A

digen hat eine Beschädigung der Komponenten und
Erlöschen des Garantieanspruchs zur Folge.

Als Teilkom ponente ist dieses Laufw erk für die Inst allation und
den Betrieb in Überein stimmung mit UL 1950, EN60950, CSA
C22.2 950-M89 und VDE0805 vorgesehen.

Seagate ist ständig bemüht, die Zulassungsfähigkeit von
Seag ate-Produ kten im Rahm en der ge genwärtig geltenden
Standards zu gewährleisten. Zu den typischen Anwendungen
dieser F estplattenwerke zählen Systemeinbau durch den
Kun den un d die Konst ruktio n von Untersystemen. Sicherheits­behörden gewähren eine bedingt e Zulassung für K omponenten
wie da s Elite-Festp lattenlauf werk vor behaltlich de r endgültig en
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 E inhal­tung der Sicherheitsanforderungen ist die Bereitstellung eines
Überlastschutzes für die SELV-Versorgungsspannungen des
Laufwerks.

Dieses G erät ist ei ne Baugr uppe und unterl iegt als solche ni cht
den Anforderungen der FCC oder ähnlicher nationaler Behörden
für eig enstän dige Ger äte. Techn ische Test ergebni sse zu elek­tromagnetische St rahl ung sind für Designer von Untersystem en
auf A nfrage von der Seagate-Sicherheitsabteilung erhältlich.

Eur opean Uni on Com pli ance

If this model has the CE Marking, it complies with the European
Union requirements of the Electromagnetic Compatibili ty Direc-

Elite 23 Installation Guide, Re v. 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 confi rm compliance
to the above directives. The drive was tested in a representative
system for typical a ppl ications. The selected system represent s
the most popular characteristics for test platforms. The system
configurations include:

• 486, Pentium, and PowerPC Microprocessors

• 3.5-inch Floppy Disc Drive

• Keyboard

• Monitor/D i spla y

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 Markin g for their product.

8 Elite 23 Install ation Guide, Rev. A

Technical support services

If you need assistance in stalling 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 ser­vices listed b elow.

SeaFONE at 1-800-SEAGATE (1-800-732-4283)

Seagate’s 800 number allows toll-free access to automated self­help 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 t his number to determine the correct access num­ber to dial. (International callers may also reach this automated
self-help service by dialing 408-456-4496).

Seag ate Techno lo gy Online serv ice s

Using a modem, you can obtain tro uble shooting tip s, free utility
programs, drive specifications and jumper settings for Seagate’s
entire product line. You can also download softw are for in stalli ng
and analyzing your drive.

SeaNET

Seagate’s Inter net connections—you can obtain technical infor­mation 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, Re v. A 9

SeaBOARD

SeaBOARD is a computer bulletin board system that contains
informatio n about Seagate Technology 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).
SeaBOARD phone numbers are listed in the following table.

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 49-89-140-9 331
Singapore 65-292-6973
Thailand 662-531-8111
Australia 61-2-9756-2359
Taiwan 886-2-719-6075

Seagate Technology Forum on CompuServe

Online technical support for Seagate products is available on
CompuServe. To access our technical support forum, type

seagate

. This forum provides information similar to that found on

go

SeaBOARD. In addition, you can type questions or browse
through previous questions and answers on the forum mes­sages.

10 Elite 23 Installation Guide, Re v. A

Seag ate Techno lo gy 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 Telephone number

United States 1-800-SEAGATE or 408-456-4496
England 44-1628-894084
Australia 61-2-9756-5170

Seagate te chnical support FAX

You can FAX questions or comments to technical support spe­cialists 24 hours daily. Responses are sent during business
hours.

Location Fax num ber

United States 408-944-9120 (8:0 0

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)

Germa ny 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 82-2-556-72 94/4251

Elite 23 Installation Guide, Re v. A 11

Seagate te chnical 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.

Location Telephone number

United States Please di al 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

12:30

P.M., 2: 0 0 P. M. –5:00 P.M., M–F)

Germa ny Disc: 49-89-140-9332;

Tape: 49-89-140-9333

Australia 61-2-9725-3366
Singapore 65-290-3998
Hong Kong 852-2368 9918

A.M.–

Taiwan 886-2-514-2237
Korea 82-2-556-8241

SeaTDD 408-944-9121

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 6:00
5:00

P.M. (Pacific time) Monday through Friday.

A.M. and

12 Elite 23 Installation Guide, Re v. A

General description

Elite 23 SCSI disc drives are high-speed, random-access digital­data storage devi ces.

The d rive is a componen t for installa tion in an enclos ure
designed for the drive. This is often a rack within the system or
an external enclosure designed to hous e one or more disc d rives
or other peripher al units. In either case, the disc drive must
receive adequate cooling (refer to “Pro viding a d equate cooling”)
and it must be sufficiently grounded and shielded from emis­sions. The

Elite 23 Product Manual

(part number 83329140)

contains guidelines for a pr operly designed enclosure.

Figure 1. El ite 23 disc drive

(N model shown)

Elite 23 Installation Guide, Re v. A 13

Table 1: Drive characterist ics

Interface UltraSCSI
Capacity

Unformatted 29.6 Gbytes
Formatted

2

23.4 Gbytes

Recording

Cylinders (user) 6,880
Read/write data heads 28
Servo heads Embedded

Seek time (typical)

3

Average read 13.2 msec
Average writ e 14.2 msec

Disc rotation

r/min 5,400 +

0.5%

1

Average latency 5. 55 msec

Internal transfer rat e 85.9 to 123

(Mbits/sec, variable with zone)

Max sync. SCSI tran sfer rate

N 20 Mbytes/sec
W/WD 40 Mbytes/sec

Multi-segmented cache 2,048 Kbytes

1

Can also be operated according to SCSI-1 and SCSI-2 proto-

cols.

2

Standard factory units are formatted as follows:

512 data bytes per s ector
6 cylinders per region
82 spares per region

3

Not including on-board controller overhead.

14 Elite 23 Installation Guide, Re v. A

Table 2: DC p ower requirements

Single-ended Differential

Voltage regulation

+5V

5

± 5%

8,10

+12V
± 5%

8

2

+5V
± 5%

8,10

+12V
± 5%

Amps

Maximum starting current

Peak DC

Delayed motor start (max)

3, 6, 9

1, 4

1.0 4.8 1.05 4.8
.85 .1 .85 .1

Peak operating current

Typical DC
Maximum (peak)

1

Measured with an average reading DC ammeter. Instanta-

1

7

.98

1.1

1.6

2.8

1.2

1.95

1.6

2.8

neous +12V current peaks will exceed th ese values.

2

A –10% tolerance is permissible during initial start of the spin-

8

2

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 dri ve is
able to accept selection by the host initiator.

3

See the +12V current profile in the

Elite 23 Product Manual

(publication number 83329140).

4

This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.

5

See “Conducted noise immunity” in the

ual.

The specified voltage tolerance is inclusive of ripple,

Elite 2 3 Product Man-

noise, and transient re sponse.

Elite 23 Installation Guide, Re v. A 15

6

At power-up, the motor current regulator limits the +12V cur­rent to an average value of less than 4.8A, although instanta­neous peaks may exceed this value. These peaks should
measure 5 msec duration or less.

7

Minimum current loading for each supply voltage is not less
than 4% of the maximum operating current shown.

8

Use separate ground returns for +5V and +12V supplies.

9

Where power is provided to multiple drives from a common
supply, carefully consider individual-drive power requirements.
Where mult iple units are powered on simulta neously, be sure
the peak starting current is available to each device.

10

No terminator power. See 11.7.3.4 in the

Elite 23 Product

Manual.

Table 3: Dimensions of the dr ive

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 po unds (15.5 kilograms)

16 Elite 23 Installation Guide, Re v. 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 mo del.

Drive models Page

ST423451N 34
ST423451W ST423451WD 38
All drives (LED indicator connections) 42

Gener al inform a tion

The following general information topics ar e discussed:

• SCSI ID jumpers

• Drive termination

• Terminator power

• Interface drivers and data path width notes

• Oth er applicable jumper options

• Providing adequate cooling

• Mounting the drive and connecting cables

• Formatting the drive

Elite 23 Installation Guide, Re v. 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. T he lower priority SCSI IDs
are normally used for other SCSI devices such as this Elite disc
drive.

Note. Most SCSI controller s (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 pro per SCSI device
inst allation.

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 Elit e 23 disc dri ves are factory s et 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 t o communicate
with the drive, a duplicate SCSI ID may be the problem. If thi s is

18 Elite 23 Installation Guide, Re v. 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 term i nati on

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 pi ece of hardware connected to your sys­tem using the SCSI bus.

The top example in Figure 2 s hows an inter nal 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 con­troll er is no longer on the end of the SCSI chain and should not
be terminated.

Note. Some controllers prefer to remain terminat ed even if t h ey

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.

Elite 23 Installation Guide, Re v. A 19
For information about how to terminate your drive, refer to the

appropriate drive-specific section.

Internal SCSI cable

Internal

SCSI device

Internal

SCSI device

Internal SCSI cable

Internal

SCSI device

Internal

SCSI device

Terminate

Controller

Terminate

Controller

External

SCSI
cable

External

SCSI device

External

SCSI device

Figure 2. SCSI bus termination

Terminator power

You usually will not need to change this option and can normally
leave the drive c onfigured as it was shipped from the factory. For
informati on about how to change the term inator power o ption on
your drive, refer to the appropriat e drive-specific section.

I/O circu its an d data path widths

• WD m odels use differ ential I/O circuit s. You cannot mix these
models with single-ended models (N, W) on the same SCSI
bus. The circuits are incompatible with each other.

• W and WD, models have a “wide” (16-bit) SCSI data bus
rather than the standard (non-wide) 8-bit SCSI data bus; how­ever, you can use these wide drives on a standard (non-wide)
8-bit data bus.

20 Elite 23 Installation Guide, Re v. A
Figures 3a, 3b, 3c, and 3d s how typical drive connections. The

following table lists the maximum cable lengths and number of
devices with single-ended I/O circuits allowed on a daisy-chain
cable for 5 and 20 M bytes/ sec I /O data transfer rates.

Table 4: Cable char acteristics for single-ended circuits

I/O transfer
rate

Maximum number of
devices on line

Maximu m cable
length allowed

5 Mbytes/s 8 (reg. SCSI bus) 6 meters (1 9.7 ft.)

5 Mbytes/s 16 (wide SCSI bus) 6 meters (19.7 ft.)
20 Mbytes/s 4 (reg. SCSI bus) 3 meters (9. 8 ft.)
20 Mbytes/s 8 (reg. SCSI bus) 1.5 meters (4.9 ft.)
20 Mbytes/s (wide SCSI bus)

1

See system documentation. ANSI spec does not specify a

11

value here.

For devices having differential I/O circuits, a maximum cable
length of 25 meters (82 feet) is allowed. A maximum of 8 devices
can be connected on an 8-bit wide data bus, and a maximum of
16 devices can be connected on a 16-bit wide data bus.

Elite 23 Installation Guide, Re v. A 21

Figur e 3 a . Fift y-pin I/O connection to drive

Figure 3b. Sixty-eight pin connection to drive

22 Elite 23 Installation Guide, Re v. A

“N” Model

Drive

*SCSI ID X

(or last drive)

*“X” means up to ID6 or the 
maximum allowable number 
of devices on the SCSI bus. 
See Table 1.

SCSI ID 1

Additional
SCSI devices

Pin 1

(check your adapter

for Pin 1 location)

Host Adapter

PCB

SCSI ID 0

Figure 3c. Multiple drive connection to host adapter

SCSI ID 7

Elite 23 Installation Guide, Re v. A 23

SCSI ID 1

*SCSI ID X

(or last drive)

“W” Model

Drive

Note: Do not mix 
“W” and “WD” 
model drives on 
the daisy chain.

Additional
SCSI devices

“WD” Model

Drive

Terminator

Module

*“X” means up to ID15 or the 
maximum allowable number 
of devices on the SCSI bus. 
See Table 1.

Pin 1

(check your adapter

for Pin 1 location)

SCSI ID 7

Host 

Adapter

PCB

SCSI ID 0

Figure 3d. Mul ti ple-drive connection to host adapter

24 Elite 23 Installation Guide, Re v. A

Pro vid ing ade qu ate coolin g

The enclosure design must ensure adequate cooling for the
drive. The maximum ambient temperature is 50°C.

The drive’s product manual (83329140) describes how to evalu­ate the air -flow design. The evaluation consists of ensurin g that
the case temperature of certain critical components remains
within acceptable li mits 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 aro und 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.

Figure 4 shows two design approaches with one or more fans
used to generate air flow. The air-flow patterns can be created
by the fans either pushing or drawing air. The overall flow pattern
can be direct ed from front to back, back to front, or side to side.

Elite 23 Installation Guide, Re v. A 25

Kühl un g des System s

Die Gehäusekonstr uktion mu ß eine ausreiche nde Kühlung de s
Laufw erkes g ewährle isten. Die U mgebun gstempera tur darf
maximal 50°C betragen.

Die Produkthandbuch Elite 23 (Dokume nt 83329140) enthal ten
Anweisungen zur Beurteilung der Luftstromkonstruktion. Die
Beurteilung muß sicherstell en, daß sich die Gehäusetemperatur
bestimm ter kr itischer Komponenten bei Laufwerkbet rieb innerh­alb zugelassener Grenzen hält.

Wir empfehlen, das Laufwerk so zu orientieren oder den Luft­strom so z u lenken, daß der gering ste Luf tstromw iderstand
erzeugt wird und gleichzeitig ein Luftstrom über den Platinen
und um die Kopf- und Festplatteneinheit (HDA) gegeben ist.
Wählen Sie einen möglichst kurzen Weg zwischen Lufteinlaß
und -auslaß. Dadur ch wird die Strecke, die die vom Laufwerk
und anderen nahegelegenen Hitzequellen aufgewärmte Luft
zurücklegt, auf ein Minimum beschränkt.

Abbildung 4 zeigt zwei K onstruktionsmöglichkeiten, bei denen
ein oder mehrere Lüfter den Luftstrom erzeugen. Der Luftstro m­verlauf wird durch die Lüfter gesteuert, die entweder Luft einbla­sen oder abziehen. Generell kann der Luftstrom entweder von
vorne nach hinten oder von hinten nach vorne verlaufen.

26 Elite 23 Installation Guide, Re v. A

.

Above unit
Über der Einheit

Under unit
Unter der Einheit

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

Hinweis. Luftstrom in der angezeigten Richtung
(von vorne nach hinten) oder in umgekehrter
Richtung (von hinten nach vorne)

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

Hinweis. Luftstrom in der angezeigten Richtung oder in
umgekehrter Richtung (von Seite zu Seite)

Figure 4. Suggested air flow
Abbildu ng 4. Empfohlener Luftst romverlauf

Above unit
Über der Einheit

Under unit
Unter der Einheit

Elite 23 Installation Guide, Re v. A 27

Mou nti ng the driv e and conne ctin g cabl es

Do not touch the c onnector pins or any com ponents on the con­trol board without observing static-discharge precautions.
Alw ays handle the drive by the frame onl y.

The drive may be m ounted in any orientati on (horizontall y, verti ­cally, and any combination thereof); however, you must ensure
that the drive receives adequate air flow for cooling.

1. Mount the driv e to the host system’s chassis using four 6-32
UNC screws. Two mounting holes are in each side of the
HDA and there are four mounti ng holes in the bottom of the
HDA.

The maximum length that the screws should extend i nto the
HDA mounting holes is 0.17 inch (4.318 mm), measured
from the outer surf ace of the HDA. Tighten the screws down
evenly. Do not over-tighten or force the screw if it does not
seem to screw in easily, because this means the threads
are not properly aligned. In this case, back the screw out
and try again.

Instal latio n des Laufwer kes
und Anschluß der Kabel

Beachten Sie beim Handhaben und Anfassen der Anschlußstifte
und Komponenten die Vorsichtsmaßnahmen zur Verhinderung
statischer A ufladung. Fassen Sie das Laufwerk nur am Rahmen
an.

Das Laufwerk kann in beliebiger Orientierung (horizontal, ver­tikal oder schräg) installiert werden; jedoch muß dafür gesorgt
werden, daß ein ausreichender Luftstrom z ur Kühlung des Lauf­werkes vorhanden ist.

28 Elite 23 Installation Guide, Re v. A

1. Befestigen Sie da s Laufwerk mit vier 6-32-UNC-Schr auben
am Geh äuse des Host-Systems. Di e beiden Seiten des
Laufwerkes sind m it jeweils zwei Befestigungslöchern
versehen, die Unterseite des Laufwerkes weist vier weitere
Befestigungslöcher auf.

Geme ssen von der Außenfläche des Gehä uses dürfen die
Schrauben maximal 4,318 mm in die Befestigungslöcher
des Gehüuses hineinrag en. Die Schrauben müssen gleich­mäßig, jedoch nicht zu fest, angezogen werden. W enn sich
eine Schraube nicht ohne Widerstand einschrauben läßt,
sind di e Gewinde ni cht korrekt anei nander ausger ichtet. In
diesem Fall die Schraube nicht in das Gewindeloch
forcieren, so ndern die Schraube herausnehmen und erneut
in das Gewindeloch einführen.

2. Verify that all connections between the drive and the host
system are correctl y installed.

2. Prüfen Sie, ob alle Verbindungen zwischen dem Laufwerk
und dem Host-System korrekt hergestellt sind.

3. Verify that you have correctly installed jumpers.

3. Stellen Sie sicher, daß die Kennungsbrücken installiert sind.

4. Connect the SCSI cable into the drive’s SCSI connector.
Take care not to stretch or crimp this cable, and do not
block the system’s cooling air flow with the cabl e.

The drive receives DC power through a 4-pin connector
mounted next to the SCSI connector. The output of a power
supply must meet SELV (safety extra low voltage) as

Elite 23 Installation Guide, Re v. A 29

defined in IEC 950. Figure 5 provides the pin information for
the DC power connector. To connect the DC power cable to
the drive, simply insert the cable end into the drive’s DC
power connect or.

4. Schließen Sie das SCSI-Kabel an den SCSI-Steckverbinder
des L aufwerke s an. Das Ka bel darf nicht gedehn t oder
gedrückt werden und es darf den Luftstr o m zur K ühlung des
Systems nicht b ehindern.

Das Laufwerk wird über einen 4-poligen, neben dem SCSI­Anschluß befestigte n Steckverbinder mit Gleichstrom ver­sorgt. Der Ausgang eines Netzteils muß SELV (safety extra
low vo ltage) nac h IE C 950 entspre chen. Abbi ldung 5 zeigt
die Steckerbelegung für den G leichstromanschluß. Zum
Anschluß des Gleichstromkabels an das Laufwerk das
Kabelende in den Gleichstromanschluß des Laufwerkes
stecken.

Pin

1
2
3
4

Power

+12V
+12V return
+ 5V return
+ 5V

Pin

1
2
3
4

Gleichstrom

+12 V
+12 V Rückleitung
+ 5 V Rückleitung
+ 5 V

4321

Figure 5. DC power connector
Abbildu ng 5. Gleichstromanschluß

30 Elite 23 Installation Guide, Re v. A
Note. Signal ground on the printed circuit board assembly

(PCB) and the head and disc assembly (HDA) are con­nected together in this drive and you cannot separate
them. Ensure the equipment in which you have mounted
the drive is connected directly to the HDA. Maximizing
the conductive contact area between HDA ground and
system ground may r educe radiated emissions.

If you do not want the system chassis to be connect ed to
the HDA/PCB ground, you must provide a nonconducti ve
(electrically isolating) method of mounting the drive in t he
host system. This may increase radiated emissions and
is the system designer ’s responsibility.

Hinw eis:

Die Signalerde auf der Stromregelungskarte (PCB) und
der Kopf- und Festplatteneinheit (HDA) sind in diesem
Laufwerk miteinander verbunden und können nicht
getrennt werden. Das Gerät, in das Si e das Laufwerk
eingebaut haben, ist ohne elektrisch isolierende
Stoßdämpfer direkt an die HDA und PCB angeschlos sen.
Die elektromagnetische Strahlung kann reduziert wer­den, indem Sie eine möglichst große leitende Kontak­fläche zwischen der HDA-Er dung und der Systemerdung
vorsehen.

Wenn Sie das Sy stemgehäuse nicht an die HDA/PCB­Erdung anschließ en wollen, müssen Sie das Laufwerk
auf nichtleitende Weise (galvanisch isoliert) im Host-Sys­tem einbauen. Die daraus u.U. resultierende verstärkte

Elite 23 Installation Guide, Re v. A 31

elektromagnetische Strahlung fällt i n den Zuständigkeits­bereich des Systemdesigners.

5. Replace the host system’s cover.

5. Setzen Sie das Gehäuseoberteil des Host-Systems wieder
auf.

32 Elite 23 Installation Guide, Re v. A

[3]

L

F

JK

H

D

A

E

[2]

C

G

B

[4]

[1]

Notes:



Mounting holes two on each side,

[1]

6-32 UNC. Max screw length into



side of HDA 0.17 in. (4.318 mm).







Mounting holes four on bottom, 

[2]

6-32 UNC. Max screw length into



bottom of drive 0.18 in. (4.572 mm).







Power and interface connections.

[3]





Decorative front panel.

[4]

Inches Millimeters

A
B
C
D
E

F
G
H

J

K

L

8.000

5.750

2.875

2.950

3.120

0.860

5.500

0.125

3.120

2.950

3.240

±
±
±
±
±
±
±
±
±
±
±

0.010

0.010

0.010

0.020

0.010

0.005

0.010

0.010

0.010

0.020

0.020

203.20 

145.05 

73.02 

54.93 

79.25 

21.84 

139.70 

2.17 

79.24 

74.93 

82.30

.25

±

.25

±

.25

±

.50

±

.25

±

.13

±

.25

±

.25

±

.25

±

.50

±

.50

±

Figure 6. Mounting configuratio n dimensions

Elite 23 Installation Guide, Re v. A 33

Formatting the drive

Warning. 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
that previously has been used to store data, unless
your intention is to erase all user data.

Note. Seagate is not responsible for lost user data.

1. Turn on DC power.

2. Boot the system from a system floppy disc or from a previ­ously installed hard disc dri ve if there is one.

3. Format the disc drive. Elite 23 disc drives are designed to
operate with a variety of operating systems. Please refer to
your sy stem or SCSI c ontroller manual for information about
formatting and setting up the drive. Some quick desktop
system notes are provided below.

Quick reference desktop system notes
Note. Refer to your system or utility manual for detailed in struc-

tions)

• DOS. Set the drive type in CMOS to “

hard drive installed

.” Use FDISK.EXE and FORMAT.EXE.

Zero,” “None,”

or “

No

Systems that have operating system Windows 95 release
950B or later do not need to partition the drive.

• Macintosh. Use a third-party drive utility (Apple’s HD Setup

utility only works with drives having special Apple firmware).

34 Elite 23 Installation Guide, Re v. A

N drive s

N/ND drives sectionSettin g the SCS I ID jumpers

Use the J4A connector to set the SCSI ID (see Figure 7) on
model ST423451N. To change the SCSI ID, install jumpers on
the appropriate pins as shown in the illustr ation.

J4A

Pin 1

J01

J4B

J4A

Pin 1

SCSI ID = 0 (default)
SCSI ID = 1
SCSI ID = 2

SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6

Pin 1

SCSI ID = 7

Figure 7. Setting the SCSI ID on N mo dels

Elite 23 Installation Guide, Rev. A 35

N drive s

Terminating the drive

ST423451N drives are terminated wit h permanently mounted IC
active termi nators. If you install one of these drives and it is not
on the end of the SCSI bus, disable the terminators by removing
the TE jumper from pins 19 and 20 of connector J4A (see Figure

7). If you install the drive on the end of the SCSI bus, enable ter-

mination by installing a jumper on pins 19 and 20 of connector
J4A.

J4A

Pin 1

J4A

Pin 1

Terminator Enabled (TE)
Terminator Disabled (TE)

Figure 8. Terminating the drive

J01

J4B

Pin 1

Pin 19

36 Elite 23 Installation Guide, Re v. A

N drive s

Terminator power

There are three possible terminator power configurations for
ST423451N dr ives (see Figure 9). You will not normally need to
change this option and can leave the drive configured as it was
shipped from the factory.

Pin 2

Pin 1

J01

Pin 4

Pin 3

Pos. B

Pos. A

Pin 4

Pos. 2
Pos. 1

Pin 3

Terminator Power Option (TP)

Pin 2

J01

Pin 1

Internal terminator power source.
External terminator power source.
Internal terminator and drive power to I/O.

Figure 9. Set ting term inator power jumpers on

N models

Elite 23 Installation Guide, Rev. A 37

N drive s

Oth er app licab le jump er opti on s

Several other jumper options are available as illustrated in Fig­ure 10.

J4A

Pin 1

J01

J4B

J4B

Pin 1

Spinup Delay Option (DS)
Immediate spinup (if the Start Command 

option jumper is disconnected)
Spinup delay equal to the SCSI Bus ID

multiplied by 12 seconds (if the Start 
Command option jumper is disconnected).

Start Command Option (ME)
Start spindle according to the Spinup 

Delay option jumper.
Start spindle after the SCSI Bus sends 

a Start Unit command.
SCSI Bus Parity Check (PD)

Check the parity of data bytes read from 
the SCSI Bus.

Pin 1

Ignore parity check.
Reserved

Figure 10. Additional jumper options

38 Elite 23 Installation Guide, Re v. A

W/WD drives

W/WD drives secti onSettin g the SCS I ID jumpers

Use the J4A jumper block to set the SCSI ID (Figure 11) on mod­els ST423451W/WD. To change the SCSI ID, install jum pers on
the appropriate pins as shown in the illustr ation.

J4A

Pin 1

SCSI ID = 0 (default)
SCSI ID = 1
SCSI ID = 2

SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8*

SCSI ID = 9*

Pin 15

Pin 1

SCSI I/O

Connector

J4A

J6

DC Power
Connector

J01

J4B

Pin 1

SCSI ID = Ah (10)*
SCSI ID = Bh (11)*
SCSI ID = Ch (12)*
SCSI ID = Dh (13)*
SCSI ID = Eh (14)*
SCSI ID = Fh (15)*

Figure 11. Setting the SCSI ID on W/WD models

Elite 23 Installation Guide, Rev. A 39

W/WD drives

Terminating the drive

ST423451W drives are terminate d with permanently mounted IC
active termi nators. If you install one of these drives and it is not
on the end of the SCSI bus, disable the terminators by removing
the TE jumper from pins 19 and 20 of connector J4A. If you
install the drive on the end of the SCSI bus, enable termination
by installing a jumper on pins 19 and 20 of connector J4A (see
Figure 12).

Note. Use active (ANSI SCSI- 2 Alter nati ve 2) termin ators when

terminating the bus.

ST423451WD drives do not have internal terminators or any
other way of adding internal termination to the drive. You must
provide external differential termination to these drives when ter­mination is required.

J4A

Pin 1

J01

J4B

Pin 1

J4A

Pin 19

Terminator Enabled (TE)
Terminator Disabled (TE)

Figure 12. Terminati ng the drive (ST423451W shown)

Pin 1

40 Elite 23 Installation Guide, Re v. A

W/WD drives

Terminator power

There are three possible terminator power configurations for
ST423451W drives (see Figure 13). You will not normally n eed
to change this option and can leave the drive configured as it
was shipped from the factory.

There are two possible terminator power configurations for
ST423451WD drives ( see Figure 13).

Pin 2

Pin 1

Pin 4

Pin 3

J01

Pos. B

Pos. A

Pin 4

Pos. 2
Pos. 1

Pin 3

Terminator Power Option (TP)

Pin 2

J01

Pin 1

Internal terminator power source.
External terminator power source.
Internal terminator and drive power to I/O.

Figure 13. Setting terminator power jumpers on

W models

Elite 23 Installation Guide, Rev. A 41

W/WD drives

Oth er app licab le jump er opti on s

Other option jumpers are available as illustrated below.

J4A

Pin 1

J01

J4B

J4B

Pin 1

Spinup Delay Option (DS)
Immediate spinup (if the Start Command 

option jumper is disconnected)
Spinup delay equal to the SCSI Bus ID

multiplied by 12 seconds (if the Start 
Command option jumper is disconnected).

Start Command Option (ME)
Start spindle according to the Spinup 

Delay option jumper.
Start spindle after the SCSI Bus sends 

a Start Unit command.
SCSI Bus Parity Check (PD)

Check the parity of data bytes read from 
the SCSI Bus.

Pin 1

Ignore parity check.
Reserved

Figure 14. Additional jumper options

42 Elite 23 Installation Guide, Re v. A

All drives

Active, Ready, and Fault indicators

The Active, Ready, and Fault LED indicator connections are
shown below.

J4A

Pin 1

J01

J4B

J6

SCSI I/O

Connector

DC Power
Connector

Pin 1

J4A

Pin 1

Reserved
Active LED Connector
Fault/Ready LED Connector
Terminator Enabled (TE)
Reserved

Note: On some LEDs the flat 
side of indicator is cathode.

Pin 18

Pin 16

Pin 15 Pin 17

Active

CATH

Fault

CATH

Figure 15. LED indicator connections for all drive models

Ready

CATH

Seag ate Tech nolo gy, Inc.
920 Disc Dri ve, Scotts Valley, CA 95066-4544, USA

Publicatio n Number: 83329130, Rev. A, Printed in USA