Seagate BARRACUDA 50 User manual

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Barracuda 50
Disc Drive
ST150176LW/LC
Installation Guide

Contents
Preface..................................................................................... 1
Electrostatic discharge protection ............................................ 2
Important safety information and precautions .......................... 3
Wichtige Sicherheitshinweise................................................... 5
Regulatory agency compliance................................................ 8
General description ................................................................ 10
Kühlung des Systems............................................................. 13
How to install the drive ........................................................... 17
Seagate Technology support services.................................... 41
©1998, 1999 Seagate Technology, Inc. All rights reserved
Publication Number: 83329472, Rev. A
March 1999
Seagate, Seagate Technology, and the Seagate logo are regis-
tered trademarks of Seagate Technology, Inc. Barracuda,
SeaFAX, SeaFONE, SeaBOARD, and SeaTDD 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 with-
out written permission from Seagate Technology, Inc.

Barracuda 50 Installation Guide, Rev. A 1
Preface
This manual contains handling information, support services,
performance specifications, and installation information for
Seagate® Barracuda 50 SCSI disc drives.
Although you can jump ahead to the installation instructions to
get up and running quickly, you may want to read the “General
description” section beginning on page 10 to learn more about
this drive’s multimode capabilities, data bus details, specifica-
tions, and cooling requirements.
Additional information is available in the
Barracuda 50 Product
Manual
(part number 83329471). Contact your Seagate sales
representative if you need to order this publication.

2 Barracuda 50 Installation Guide, Rev. A
Handling precautions
• Disc drives are fragile. Do not drop or jar the drive. Use a
padded surface during installation to avoid damaging the
drive.
• Keep the drive in its antistatic bag until you are ready to
install it.
• Protect the drive from static discharge by making sure you
are well grounded before touching the drive. We recommend
wearing a grounded wrist strap (Seagate part number
12263496) throughout the installation process. Do not touch
the connectors or any part of the printed circuit board.
• Always handle the drive by its edges or frame.
• Do not apply pressure or attach labels to the circuit board or
the top of the drive.
Electrostatic discharge protection
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
Caution. Removal of circuit boards by personnel not
performing depot repair will damage components and
may void the warranty.

Barracuda 50 Installation Guide, Rev. A 3
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 car-
rier or tray prior to inserting it into the system.
Important safety information and precautions
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 fol-
Caution. Use forced-air ventilation when bench-test-
ing the drive to ensure proper cooling of drive compo-
nents.

4 Barracuda 50 Installation Guide, Rev. A
lowed to minimize or eliminate the risk of personal injury. The
warnings point out conditions or practices that may endanger
you or others. The cautions point out conditions or practices
that may damage the unit, possibly making it unsafe for use.
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.
• 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.

Barracuda 50 Installation Guide, Rev. A 5
As a component, this drive is designed to be installed and oper-
ated in accordance with UL1950, EN60950, CAN/CSA C22.2
950-M95, 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.
This unit is a component part and as such is not meant to com-
ply 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 Fremd-
belüftung vorzusehen, um eine ausreichende Kühlung der Lauf-
werkkomponenten sicherzustellen.
Verwenden Sie geeignete Sicherheits- um den sicheren, zuverläs-
sigen Betrieb dieser Einheit zu gewährleisten.
Die Verfahren in diesem Handbuch und die Aufkleber auf dem Gerät
enthalten Warn- und Vorsichtshinweise. Diese Hinweise sind sorg-
fältig durchzulesen und zu beachten, um das Risiko von Verletzun-
gen auf ein Mindestmaß zu beschränken oder ganz zu vermeiden.
Die Warnhinweise machen auf Situationen oder Praktiken aufmerk-

6 Barracuda 50 Installation Guide, Rev. A
sam, 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 entsprech-
end zu beraten. Aus diesem Grund haben wir auf eine derartige
umfassende Beurteilung verzichtet. Falls Sie ein hier nicht beschrie-
benes Verfahren oder Werkzeug verwenden, stellen Sie zuerst
sicher, daß das gewählte Verfahren weder Ihre persönliche Sicher-
heit noch die Leistung der Einheit gefährdet.
Beachten Sie in jedem Fall die folgenden Warn-und Vorsichtshin-
weise:
• Beachten Sie alle Warn- und Vorsichtshinweise in diesem Hand-
buch.
• 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 Fehler-
diagnose 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
ist, 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 besonders auf den oberen Stapelbereich, da
dort die Temperatur gewöhnlich am höchsten ist.
• Befolgen Sie die oben unter “Electrostatic Discharge Protection”
angegebenen Sicherheitsmaßnahmen.
• Nehmen Sie keine Platinen aus dem 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 zuständigen kann zu einer Bes-

Barracuda 50 Installation Guide, Rev. A 7
chädigung 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 auseinander-
genommen werden! Öffnen der versiegelten HDA durch andere Per-
sonen als die für die werkseitige Reparatur zuständigen hat eine
Beschädigung der Komponenten und Erlöschen des Garantieans-
pruchs zur Folge.
Als Teilkomponente ist dieses Laufwerk für die Installation und den
Betrieb in Übereinstimmung mit UL 1950, EN60950, CAN\CSA
C22.2 950-M95 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 Festplatten-
werke zählen Systemeinbau durch den Kunden und die Konstruktion
von Untersystemen. Sicherheitsbehörden gewähren eine bedingte
Zulassung für Komponenten wie das Barracuda-Festplattenlaufwerk
vorbehaltlich der endgültigen Zulasssung im Endprodukt. Designer
von Untersystemen sind dafür verantwortlich, die Voraussetzungen
für die Einhaltung sicherheits- oder aufsichtsbehördlicher Vor-
schriften 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 Lauf-
werks.
Dieses Gerät ist eine Baugruppe und unterliegt als solche nicht den
Anforderungen der FCC oder ähnlicher nationaler Behörden für
eigenständige Geräte. Technische Testergebnisse zu elektromag-
netische Strahlung sind für Designer von Untersystemen auf
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.

8 Barracuda 50 Installation Guide, Rev. A
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
DC power requirements on page 16.
Electromagnetic compliance
Seagate uses an independent laboratory to confirm compliance
to the directives/standard(s) for CE Marking and C-Tick Marking.
The drive was tested in a representative system for typical 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.

Barracuda 50 Installation Guide, Rev. A 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 Barracuda 50 Installation Guide, Rev. A
General description
Barracuda 50 SCSI disc drives are high-speed, random-access
digital-data storage devices capable of operating in single-ended
(SE) or low voltage differential (LVD) modes.
This multimode capability allows you to use this drive in systems
that use the traditional SE technology or in LVD-capable sys-
tems.
Figure 1. Barracuda 50 family drive (LW model shown)
This drive should be mounted in an enclosure designed for the
drive. This is often within the host system case or an external
enclosure designed to house one or more disc drives or other
devices. In either case, the disc drive must receive adequate
cooling (refer to “Providing adequate cooling”) and it must be
sufficiently grounded and shielded from emissions. The
Barra-
cuda 50 Product Manual
(part number 83329471) contains
guidelines for a properly designed enclosure.

Barracuda 50 Installation Guide, Rev. A 11
Single-ended and low voltage differential modes
This drive incorporates two different transceivers to allow you to
use it in systems which use single-ended (SE) drivers and
receivers, or in low voltage differential (LVD) capable systems
which use LVD drivers and receivers.
You can configure the drive to switch between SE and LVD
modes automatically or force it to operate in SE mode only. To
configure this option, use the jumper illustration on page 24 (LW
models) or page 34 (LC models).
Note. To operate at the Ultra2 SCSI rates in LVD mode, all
devices on the same bus must be running in LVD mode. If
you add any single-ended device to a bus that is operat-
ing in LVD mode, all devices drop back to operating in
single-ended mode. This eliminates the possibility of
reaching Ultra2 SCSI transfer rates.
The primary benefits of LVD technology
• Faster transfer rates.
• Reduces power consumption.
• Increases allowable cable lengths.
• Improves device connectivity.
Caution. Do not mix LVD drives on the same bus with
devices having high voltage differential (HVD) interface
circuits. The circuits are not compatible and drive dam-
age may occur.

12 Barracuda 50 Installation Guide, Rev. A
Data bus widths
These drives have a wide (16-bit) SCSI data bus. You can use
these drives on a non-wide (8-bit) data bus if you provide proper
termination to the upper eight data lines. This is often referred to
as providing “high-9 termination” (the other bit is for parity).
The following table lists the maximum cable lengths and number
of devices using single-ended and LVD I/O circuits.
Providing adequate cooling
The enclosure design must ensure adequate cooling for the
drive. The maximum ambient temperature allowed is 50°C.
The drive’s product manual (83329471) describes how to evalu-
ate the air-flow design. The evaluation consists of ensuring that
the case temperature of certain critical components remains
within acceptable limits during drive operation.
Figure 2 shows two design approaches with one or more fans
used to generate air flow. The air-flow patterns can be created
Table 1. SE and LVD bus configurations
SCSI
driver
type I/O transfer rate (Mbytes/s)
Maximum
number of
deviceson
bus
Maximum cable
length allowed
SE 20 16 6 meters (19.7 ft.)
SE 40 4 3 meters (9.8 ft.)
SE 40 8 1.5 meters (4.9 ft.)
LVD 80 16 12 meters (39.4 ft.)

Barracuda 50 Installation Guide, Rev. A 13
by the fans either pushing or drawing air. The overall flow pattern
can be directed from front to back, back to front, or side to side.
Kühlung des Systems
Die Gehäusekonstruktion muß eine ausreichende Kühlung des Lauf-
werkes gewährleisten. Die Umgebungstemperatur darf maximal
50°C betragen.
Die Produkthandbuch Barracuda 50 (Dokument 83329471)
enthalten Anweisungen zur Beurteilung der Luftstromkonstruktion.
Die Beurteilung muß sicherstellen, daß sich die Gehäusetemperatur
bestimmter kritischer Komponenten bei Laufwerkbetrieb innerhalb
zugelassener Grenzen hält.
Abbildung 2 zeigt zwei Konstruktionsmöglichkeiten, bei denen ein
oder mehrere Lüfter den Luftstrom erzeugen. Der Luftstromverlauf
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.

14 Barracuda 50 Installation Guide, Rev. A
.
Figure 2. Suggested air flow
Abbildung 2. Empfohlener Luftstromverlauf
Above unit
Under unit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Above unit
Under unit
Note. Air flows in the direction shown or
in reverse direction (side to side)

Barracuda 50 Installation Guide, Rev. A 15
Characteristics ST150176LW/LC
Interface Ultra2 SCSI1
Capacity
Formatted (Gbytes)250.0
Recording
Cylinders (user)
Read/write data heads
Avg bytes/track
12,024
22
189.28
Access time3
Average read (msec)
Average write (msec) 7.6 8.4
Disc rotation
RPM
Average latency (msec) 7,184
4.17
Synchronous data transfer rate
Maximum instantaneous (Mbytes/
sec) 40 (SE mode)
80 (LVD mode)
Asynchronous data transfer rate
Maximum instantaneous
(2 bytes wide) (Mbytes/sec) 10.0
Multi-segmented cache (kbytes) 1,024 standard
4,096 optional
1. Also operates per SCSI-1/SCSI-2/SCSI-3 protocols.
2. The specified formatted capacities are calculated with the standard
OEM sector size (512 bytes per logical block) and sparing.
3. Includes on-board controller overhead.

16 Barracuda 50 Installation Guide, Rev. A
Single-ended (SE)
mode
Low voltage
differential
(LVD) mode
DC power requirements (±5%)1
1. For more detailed power information, refer to the Barracuda 50 Product
Manual, publication number 83329471.
+5V+12V +5V+12V
ST150176LW/LC
Maximum start current
Maximum operating current
Average idle current
0.76
0.77
0.68
2.6
1.17
0.68
0.77
0.81
0.69
2.6
1.17
0.68

Barracuda 50 Installation Guide, Rev. A 17
How to install the drive
This installation guide provides step-by-step instructions to make
your drive installation as easy as possible. Follow the installation
steps listed for your drive model as listed below:
ST150176LW (use the installation steps beginning below).
ST150176LC (use the installation steps beginning on page 30).
ST150176LW installation
1. Set the SCSI ID on the drive.
Determine which SCSI IDs are already being used in the
system and then assign this disc drive a SCSI ID that isn’t
already being used. Use the J6 connector located on the
front of the drive to set the SCSI ID (see Figure 3).
• This drive is SCAM (SCSI Configured Auto Mati-
cally) compliant. If you are installing this drive in a
SCAM compliant system, you can skip this step
because the system automatically assigns the drive SCSI
ID.
• The host system’s SCSI controller usually uses SCSI ID 7
so this SCSI ID is not usually available for disc drives or
other devices.
• Most ST150176LW drives are factory set with the SCSI ID
set at 0. If this is the only SCSI drive in your system and
there areno otherSCSI devices onthe daisychain, you can
leave this drive’s SCSI ID set to 0 and proceed to the next
step.A device is any hardware other than an inline termina-
tor that is connected to the SCSI cable.

18 Barracuda 50 Installation Guide, Rev. A
Figure 3. Setting the SCSI ID on ST150176LW drives
SCSI ID = 0 (default)
Jumper Plug
(enlarged to
show detail)
J6
Drive
Front
Pin 1
Reserved
A2A1A0
[4]
[1]
A
L
E
D
R
E
S
3
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
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15