Seagate BARRACUDA 4LP ST32171N/W/WC/WD/DC User manual

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Barracuda 4LP
Disc Drive
ST34371N/W/WC/WD/DC
ST32171N/W/WC/WD/DC
ST34571N/W/WC/WD/DC
ST32271N/W/WC/WD/DC
Installation Guide
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Contents
Preface ........................................................................................1
Electrostatic discharge protection................................................1
Important safety information and precautions..............................2
Wichtige Sicherheitshinweise ......................................................4
European Union Compliance.......................................................7
Technical support services...........................................................8
General description....................................................................12
Initial setup information..............................................................17
Kühlung des Systems................................................................27
Installation des Laufwerkes
und Anschluß der Kabel..........................................................29
N drives section.........................................................................36
W/WD drives section .................................................................40
WC/DC drives section................................................................45
©1997 Seagate Technology, Inc. All rights reserved
Publication Number: 77767492, Rev. B
January 1997
Seagate, Seagate Technology, and the Seagate logo are regis-
tered trademarks of Seagate Technology, Inc. Barracuda,
SeaFAX, SeaFONE, SeaNET, SeaTDD, and SeaBOARD are
either trademarks or registered trademarks of Seagate Technol-
ogy, Inc. or one of its subsidiaries. All other trademarks or regis-
tered 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.

Barracuda 4LP Installation Guide, Rev. B 1
Preface
This manual contains information for users of the Seagate®
Barracuda 4LP SCSI disc drives. It provides support services,
performance specifications, and initial setup information. Addi-
tional information is available in the
Barracuda 4LP Product
Manual
(part number 77767491). Contact your Seagate sales
representative 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 semi-
conductors 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 Barracuda 4LP Installation Guide, Rev. B
• 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

Barracuda 4LP Installation Guide, Rev. B 3
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.
• Do not remove the head and disc assembly (HDA) from the
drive. Return the entire drive for depot repair if the HDA is
defective.
• Do not attempt to disassemble the HDA. It is not field repair-
able. 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 Barracuda 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 overcurrent protection on drive SELV supply voltages.

4 Barracuda 4LP Installation Guide, Rev. B
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.
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.

Barracuda 4LP Installation Guide, Rev. B 5
Beachten Sie in jedem Fall die folgenden Warn-und Vorsicht-
shinweise:
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem
Handbuch.
• Treffen Sie beim Betrieb, bei der Installation oder bei der
Entfernung der Einheit angemessene Sicherheitsvorkehrun-
gen.
• Wenn eine Einheit unter Spannung steht, gehen Sie bei der
Fehlerdiagnose besonders vorsichtig vor. Schalten Sie die
Einheit 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.

6 Barracuda 4LP Installation Guide, Rev. B
• Die vormontierte Kopf- und Festplatteneinheit (HDA) nicht aus
dem Laufwerk 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-
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 Barracuda-Festplattenlaufwerk vorbehaltlich der
endgültigen Zulasssung im Endprodukt. Designer von Untersys-
temen 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 Ein-
haltung 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 elektro-

Barracuda 4LP Installation Guide, Rev. B 7
magnetische 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-
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
• Mouse
• Printer
Although the test system with this Seagate model complies to
the directives, we cannot guarantee that all systems will comply.
The computer manufacturer or system integrator shall confirm
EMC compliance and provide CE Marking for their product.

8 Barracuda 4LP Installation Guide, Rev. B
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®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
touch-tone phone. If you need to speak to a technical support
engineer, dial this number and listen to the options for technical
support. (International callers can 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™
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).

Barracuda 4LP Installation Guide, Rev. B 9
SeaBOARD®
SeaBOARD is a computer bulletin board system (BBS) that con-
tains information about Seagate’s disc and tape drive products
and is available 24 hours daily. Set your communications soft-
ware to eight data bits, no parity, and one stop bit (8-N-1). Sea-
BOARD phone numbers are listed in the following table.
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.
BBS Location Modem number
United States Disc: 408-434-1080;
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 Barracuda 4LP Installation Guide, Rev. B
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.
Seagate technical support
You can talk to a technical support specialist during business
hours Monday through Friday for one-on-one technical help.
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
England 44-1628-890660
France 33 1-46 04 42 50
Germany 49-89-1430-5100
Australia 61-2-9725-4052
Singapore 65-293-4722
Hong Kong 852-2368 7173
Taiwan 886-2-715-2923
Korea 82-2-556-7294/4251

Barracuda 4LP Installation Guide, Rev. B 11
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. to
11:15 A.M. and 12:30 P.M. to 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. to
11:15 A.M., 12:30 P.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)
Australia 61-2-9725-3366
Singapore 65-290-3998 or 65-485-3998 (9:00 A.M. to
12:00 P.M., 2:00 P.M. to 5:00 P.M., M–F)
Hong Kong 852-2368 9918
Taiwan 886-2-514-2237
Korea 82-2-556-8241

12 Barracuda 4LP Installation Guide, Rev. B
General description
Barracuda 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
Barracuda 4LP Product Manual (part number
77767491) contains guidelines for a properly designed
enclosure.
*Model “N” version with 50-pin SCSI I/O connector
Figure 1. Barracuda 4LP family drive
*

Barracuda 4LP Installation Guide, Rev. B 13
Table 1. Drive characteristics
Interface UltraSCSI [1]
Capacity Formatted [2] Unformatted
ST34371 4.35 Gbyte [2] 5.31 Gbyte
ST32171 2.16 Gbyte [2] 2.65 Gbyte
ST34571 4.55 Gbyte [2] 5.54 Gbyte
ST32271 2.26 Gbyte [2] 2.77 Gbyte
Recording
Cylinders (user) 5,178
Read/write data heads
ST32171/ST32271 5
ST34371/ST34571 10
Access time [3]
Average read 9.4 msec
Average write 10.4 msec
Disk rotation
RPM 7,200 r/min
Average latency 4.17 msec
Internal transfer rate (variable with zone)
ST32171/ST34371 80–122 Mbits/sec
ST32271/ST34571 80–126 Mbits/sec
Maximum synchronous SCSI transfer rate
N model 20 Mbytes/sec
W/WD/WC/DC models 40 Mbytes/sec
Multi-segmented cache 442 Kbytes
[1] Can also be operated according to SCSI-1 and SCSI-2 protocols.
Referred to also as “SCSI Fast-20.”

14 Barracuda 4LP Installation Guide, Rev. B
[2] Standard factory units are formatted 512 data bytes per sector with
sparing equivalent to eighty spare sectors per eight cylinder region.
Spares are located at the end of each sparing region.
[3] Includes controller overhead.
Table 2a. DC power requirements (Amps)
Notes for this table follows Table 2b.
ST34371/ST34571
N/W/WC
Single-ended WD/DC Differential
Voltage +5V +12V +5V +12V
Regulation [5] ±5% ±5%[2] ±5% ±5%[2]
Max. operating current
DC3σ [1] 0.81 0.95 1.21 0.95
Avg. idle current DCX [1] 0.46 0.54 0.70 0.54
Max. starting current
(peak DC) DC3σ[3]
(peak AC) AC3σ[3] 0.78 2.44 3.1 1.1 2.44 3.1
Delayed motor start (max)
DC3σ [1][4] 0.48 0.20 0.90 0.20
Peak operating current
Typical DCX [1][6]
Maximum DC3σ [1]
Maximum (peak) 3σ
0.75
0.81
1.5
0.76
0.95
2.5
1.05
1.21
2.0
0.76
0.95
2.5

Barracuda 4LP Installation Guide, Rev. B 15
Table 2b. DC power requirements (Amps)
[1] Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
[2] A –10% droop is permissible during initial start of the spindle
but must return to ±5% before reaching 7,200 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.
[3] See the +12V current profile in the
Barracuda 4LP Product
Manual
(publication number 77767491).
[4] This condition occurs when the Motor Start option is enabled
and the drive has not yet received a Start Motor command.
ST32171/ST32271
N/W/WC
Single-ended WD/DC Differential
Voltage +5V +12V +5V +12V
Regulation [5] ±5% ±5%[2] ±5% ±5%[2]
Max. operating current
DC3σ [1] 0.81 0.85 1.21 0.85
Avg. idle current DCX [1] 0.46 0.52 0.70 0.52
Max. starting current
(peak DC) DC3σ[3]
(peak AC) AC3σ[3] 0.78 2.00 3.1 1.1 2.00 3.1
Delayed motor start (max)
DC3σ [1][4] 0.50 0.20 0.90 0.20
Peak operating current
Typical DCX [1][6]
Maximum DC3σ [1]
Maximum (peak) 3σ
0.72
0.81
1.5
0.73
0.85
2.3
0.91
1.21
2.0
0.73
0.85
2.3

16 Barracuda 4LP Installation Guide, Rev. B
[5] See “Conducted noise immunity” in the Barracuda 4LP Prod-
uct Manual.
The specified voltage tolerance is inclusive of
ripple, noise, and transient response.
[6] Operating condition is defined as random seek read opera-
tions with a block count of 64.
General Notes from Tables 2a and 2b.
1. Minimum current loading for each supply voltage is not less
than 4% of the maximum operating current shown.
2. Use separate ground returns for +5V and +12V supplies.
3. Where power is provided to multiple drives from a common
supply, carefully consider individual drive power require-
ments. Where multiple units are powered on simulta-
neously, be sure the peak starting current is available to
each device.
Table 3. Dimensions of the drive
inches mm
Height 1.00 25.4
Width 4.00 101.6
Depth 5.74 145.8
Weight 1.5 pounds (0.68 kilograms)

Barracuda 4LP Installation Guide, Rev. B 17
Initial setup information
The general information beginning on this page applies to all of
the Barracuda 4LP drive models. After reading the general infor-
mation topics, refer to the appropriate drive-specific section
listed below for additional information about configuring and
installing your particular model.
Drive models Page
ST32171N ST32271N
ST34371N ST34571N 36
ST32171W/WD ST32271W/WD
ST34371W/WD ST34571W/WD 40
ST32171WC/DC ST32271WC/DC
ST34371WC/DC ST34571WC/DC 45
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 cables1
• Formatting the drive
1This mounting procedure does not apply to “WC” or “DC” model
drives. To mount a “WC” or “DC” drive, plug the drive into the
system’s single connector attachment (SCA) position on the
system’s back panel.

18 Barracuda 4LP Installation Guide, Rev. B
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 Barracuda
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 Barracuda disc drives are factory set with the SCSI ID set
at 0. To change the SCSI ID, refer to the appropriate drive sec-
tion 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