Seagate BARRACUDA 50, ST150176LW, ST150176LC Installation Manual

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Barracuda 50

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Disc Drive

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ST150176LW/LC

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Installation Guide

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Contents

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

Electrostatic discharge protection ............................................ 2

Important safety informati on and precautions.. ....... .. ........... .... 3

Wich tige S ic h er h e itshin w ei se............. ... .......... .. ..... .. ... ..... .. ...... 5

Regula tory 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 regis­tered trademarks of Seagate Technology, Inc. Barracuda,
SeaFAX, SeaFONE, SeaBOARD, and SeaTDD are either trade­marks or registered trademarks of Seagate Technology, Inc. or
one of its subsidiaries. All other trademarks or registered trade­marks are the property of thei r respective owners.

No part of this publication may be reproduced in any for m with-

out writt en permission from Seaga te Technology, Inc.

Barr acuda 50 Instal lation 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-

ti ons, and cooling requiremen ts.

Additional information is available in the

Manual

(part number 83329471). Contact your Seagate sales

Barracuda 50 Product

representative if you need to order this publication.

2 Barracuda 50 Installation Guid e, 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
ins tall 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 t he circuit board or
the top of t he drive.

Electrostatic discharge protection

Caution.

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

Removal of cir cuit boards by personnel not

All drive electronic assemblies are sensitive to static electricity
due to the electrostatically sensitive devices used within the
drive circui try. Althou gh som e devices such as metal-ox ide semi­conductors are extremely sensitive, all semiconductors, as well

Barr acuda 50 Instal lation Guide, Rev. A 3
as some resistors and capacitors, ma y be damaged or degra ded

by exposure to static electricity.
Elect rost atic damage t o electr onic de vices may be caus ed 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 inst alli ng the drive on a carrier or t ra y, di scharge the car-

rie r o r tray pr io r to ins e rting it into th e syst e m .

Importan t safety information and precau tions

Caution.

ing the drive to ensure proper cooling of drive compo­nents.

Use forced-air ventilation when bench- test-

Use proper safety techniques for safe, reliable operation of this
unit.

• The procedures in this manual and l abels on the unit contain

warnings and cautions that must be carefully read and fol-

4 Barracuda 50 Installation Guid e, 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 ma y damage the unit , possibly m aking it unsafe for use.

Always observe the following warnings and precautions:

• Follow al l cautions and war nings 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 befo re re mo ving 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 tem­peratures are usual ly 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
repai r will damage compo nents and may void the w arranty.

• 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-

abl e. If t he sealed HDA is opened by personn el not performing
depot repair, this will damage components and void the
warranty.

Barr acuda 50 Instal lation 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 applica­tions of these disc drives include customer packaging and sub­system design. Safety agencies conditionally cer tify 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
acceptabilit y in obtai ning safety- regulato ry agency compliance in
their end-use products and for certifying where required by law.
A necessary part of meeting safety requi rem ents is the provision
for ov ercurre nt protection on drive SELV supp ly voltages.

This unit is a component part and as such is not meant to com­ply with FCC or similar national requirements as a stand-alone
unit. Engineering radiated emissions test results are available
through the Seagate Safety Depar tment to assist the subsystem
designer.

Wichtige Sicherheitshinweise
Vorsicht.

belüftung vorzusehen, um eine ausreichende Kühlung der Lauf­wer kkom po ne n te n sich er zust el len.

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

Beim Testen des Laufwerks auf dem Prüftisch ist Fremd-

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 ver meiden.
Die Warnhinweise machen auf Situationen oder Praktiken aufmerk-

6 Barracuda 50 Installation Guid e, Rev. A

sam, die Sie oder ander e gefährden könn ten. Die Vorsi chtshinweise
mac hen a uf Situ at ione n ode r Prak tiken aufm erks am, die E inh eit
bes chädi gen kö nnen, so da ß dere n Gebr auch mit Risik o behaf tet ist .

Di e Warn- und Vorsichtsh inweise sind nicht allumfassend! Es ist uns
einfach nicht möglich, alle Wartungsmethoden oder die eventuellen
Risiken jeder Methode zu kennen, zu beurteilen und Sie entsprech­end z u bera ten . Aus die sem Gru nd haben wir auf ei ne de rar tige
umfassende Beurteilung verzichtet. Falls Sie ein hier nicht beschr ie­benes Verfahren oder Werkzeug verwenden, stellen Sie zuerst
sicher, daß das gewählte Verfahren weder Ihre persönliche Sicher­heit noch die Leistung der Einheit gef ährdet .

Beachte n Sie in jedem Fall die folgende n Wa rn-un d Vorsich tshin­we i se:

• Beachten Sie alle Warn- und Vorsichtshinweise in diesem Hand­buch.

• Treffen Sie beim Betrieb, bei der Installation oder bei der Entfernung
der Einheit angemessene Si cherheitsvorke hrungen.

• Wenn eine Einheit unter Spannung steht, gehen Sie bei der Fehler­diagnose besonders vorsichtig vor. Schalten Sie die Einheit aus,
bevor Sie mit den Instal lations-un d Entfernungsarbeite n 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 S icherheitsmaßnahmen.

• 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-

Barr acuda 50 Instal lation Guide, Rev. A 7

chädigung der Komponenten und Erlöschen des Garantieanspruchs
führen.

• Die vor montierte Kopf- und Festplatteneinheit (HDA) nicht aus dem
Laufwerkgehäuse nehmen! Falls die HDA beschädigt ist, schicken
Sie das gesamte Laufwerk zur Repara tur ein.

• Die HDA ist nicht vor Ort reparierbar und darf nicht auseinander­genommen werden! Öffnen der versiegelten HDA durch ander e Per­sonen als die für die werkseitige Reparatur zuständigen hat eine
Beschädigung der Komponenten und Erlöschen des Garantieans­pr uc h s zu r Folg e.

Als Teilkomponente ist dieses Laufwerk für die Installation und den
Betrieb in Übereinstimmung mit UL 1950, EN60950, CAN\CSA
C2 2.2 950-M 95 und VDE0 805 vorgesehen.

Seagate ist ständig bemüht, die Zulassungsfähigkeit von Seagate­Produkten im Rahmen der gegenwär tig geltenden Standards zu
gewährleisten. Zu den typischen Anwendungen dieser Festplatten­werke zählen Systemeinbau durch den Kunden und die Konstruktion
von Untersystemen. Sicherheitsbehörden gew ähren eine bedingte
Zulassung f ür Ko m po ne nt e n w ie da s Barr ac u da - Fest pla t t en la uf werk
vorbehaltlich der endgültigen Zulasssung im Endprodukt. Designer
von Untersystemen sind dafür verantwortlich, die Voraussetzungen
für die Einhaltung s icherheits- oder aufsichtsbehördlicher Vor­schrift en in ihren Endprodukten und - falls gesetzlich vorgeschrie ben

- für die Zulassung zu schaffen. Eine Grundvoraussetzung zur Ein-

haltung de r Sicherhei tsanforderu ngen ist die Be reitstellung e ines
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 Testergebniss e zu elektromag­netis che Str ahlung s ind für Design er von Un tersystemen auf
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.

8 Barracuda 50 Installation Guid e, Rev. A

Regulatory agency compliance

Elect romagneti c susceptibil ity

As a component assembly, the drive is not required to meet any
susceptibili ty perform ance requi rem ents. It is the r esponsibilit y of
those integrating the drive within their systems to perfor m those
tests required and design their system to ensure that equipment
operating in the same system as the drive or external to t he sys­tem does not adversely affect the performance of the drive. See
DC power requirements on page 16.

Elect romagnetic compliance

Seagate uses an independent laboratory to confirm compliance
to the dir ectives/standard(s) for CE Marking and C- Tick Marking .
The drive was tested in a representative system for typic al appl i­cations. The selected system represents the most popular char­acteristics for test platforms. The sy stem configurations include:

• 486, Pentium, and PowerPC microprocessors

• 3 . 5 -inc h floppy di sc dr ive

• Keyboard

• Monitor/display

• Printer

• External mo dem

• 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 C­Tic k M arki ng for their product.

Barr acuda 50 Instal lation Guide, Rev. A 9

Elect romagn etic compliance for the European Union

If this model has the CE Marking it complies with the European
Union requirements of the Electromagnetic Compatibility Direc­ti ve 89/336/EEC of 03 M ay 1989 as am ended by Directiv e 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 Austra­lia/New Zealand Standard AS/NZS3548 1995 and meets the
Electromagnetic Compatibility (EMC) Framework requirements
of Australia’s Spectrum Management Agency (SMA).

10 Barr acuda 50 Instal lation Guide, Rev. A

General description

Barracuda 50 SCSI disc drives are high-speed, random-access
digital-data storage devices capab le of operating in single-en ded
(SE) or low voltage di fferential (LVD) modes.

This multimode capability allows you to use this drive in systems
that use the traditional SE technology or in LVD-capable sys­tems.

Figur e 1. Barrac uda 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

cuda 50 Product Manual

guidelines for a properly designed enclosure.

Barra-

(part number 83329471) contains

Barr acuda 50 Instal lation Guide, Rev. A 11

Single-ended and low voltage differential mod es

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.

The primary benefits of LVD technology

• Faster transfer rates.

• Reduces power consumption.

• Increases allowable cable lengt hs.

• Improves device connectivity.

You can configure the drive to switch between SE and LVD
modes automatically or force it to operate in SE mode only. To
configur e 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
de vices on th e same bus must be running i n LVD mode. If
you add any single-ended device to a bus that is operat­ing in LVD mode, all devices drop back to operating in
single-ended mode. This eliminates the possibility of
reaching Ultra2 SCSI transfer rates.

Cauti on.

devic es having high volt age diffe rential (HV D) int erface

Do not mix LVD drives on the same bus with

circuits. The circuits are not compatible and drive dam-

age may occu r.

12 Barr acuda 50 Instal lation 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 pr ovide proper
termination to the upper eight data li nes. This is often referred to
as providing “hi gh-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 cir cuits.

Table 1. SE and LVD b us configurations

Maximum

SCSI

number of

driver
type

I/O tran sfer rate

devices on

(Mbytes/s)

bus

Ma xi mum ca ble
length allowed

SE 20 16 6 meters (19.7 f t.)
SE 40 4 3 me te rs (9.8 ft.)
SE 40 8 1.5 meters (4.9 ft.)
LVD 80 16 12 meters (39.4 ft.)

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 evalu­ate the air-flow desi gn. 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

Barr acuda 50 Instal lation Guide, Rev. A 13
by t he fans either pushing or drawing air. The overall flow pattern

can be directed from fr ont to back, back to front, or side to side.

Kühlung des Systems

Die Gehäusekonstruktion muß eine ausreichende Kühlung des Lauf­werkes gew ährleisten. Die Umgebungstemperatur darf maximal
50°C betragen.

Die Produkthandbuch Barracuda 50 (Dokument 83329471)
enthalten Anweisungen zur Beurteilung der Luftstromkonstruktion.
Di e Beurteilung muß sicherstellen, daß sich die Gehäusetemp eratur
bestimmter kritischer Komponenten bei Laufwerkbetrieb innerhalb
zugelassener Grenzen hält .

Abbildung 2 zeigt zwei Kon struktionsmöglichkeiten, bei denen ein
oder mehrere Lüfter den Luftstrom erzeugen. Der Luftstromverlauf
wird durch die Lüfter gesteuer t, die entweder Luft einblasen ode r
abzieh en. Ge nerell ka nn d er Luftstr om e ntweder von vo rne na ch
hinten oder von hinten nach vorne verlaufen.

14 Barr acuda 50 Instal lation Guide, Rev. A

.

Above 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)

Figure 2. Suggested air flow

Abbildu ng 2. Empfohle ne r Luftst romve rla uf

Under unit

Barr acuda 50 Instal lation Guide, Rev. A 15

Characteristics ST150176LW/LC

Interface Ultra2 SCSI
Capacity

Formatted (Gbytes)

2

50.0

Recording

Cy l ind ers (us er )
Read/write data heads
Avg byt es /tr a ck

Access time

3

Average read (msec)
Average write (msec)

12,024
22

189.28

7.6

8.4

Disc rotation

RPM
Average lat ency (msec)

7,184

4.17

Synchronous data transfer rate

1

Ma ximu m in stan tan e o us (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 st andard

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 Barr acuda 50 Instal lation Guide, Rev. A

Low voltage

DC power requirements (±5%)

ST150176LW/LC

Single-ended (SE)
mode

1

+5 V+12 V +5 V+12 V

differential
(LVD) mode

Maximum start current
Ma ximu m op er a ting cu rr en t
Average idle current

1. For more detailed power information, refer to the Barracuda 50 Product
Manual, publication number 83329471.

0.76

0.77

0.68

2.6

1.17

0.68

0.77

0.81

0.69

2.6

1.17

0.68

Barr acuda 50 Instal lation Guide, Rev. A 17

How to install the drive

This installation gu ide prov ides step -by-st ep instructi ons to m ake
your drive inst allation as easy as possible. Follow the inst allation
steps li sted for your driv e m odel as listed bel ow:

ST150176LW (use the i nstallation steps beginning below).
ST150176LC (use the installation steps beginning on page 30).

ST150176LW instal lation

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 Mati­cally) compliant. If you are installing this drive in a

SCAM compliant system, you can skip this step
beca use t he sy st em auto mati cally assign s the d rive SC SI
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 factor y set with the SCSI ID
set at 0. If this is the only SCSI drive in your system and
the re a re no other S CSI d e vi ce s on th e da is yc hai n, y ou can
leave this drive’s SCSI ID set to 0 and proceed to the next
ste p . A de v ic e is an y ha r dwa r e oth er th an an i nl ine t erm in a­tor that is connected to the SCSI cable.

18 Barr acuda 50 Instal lation Guide, Rev. A

Drive
Front

Jumper Plug

(enlarged to
show detail)

Pin 1

[1]

J6

R

Reserved

L

E

E
D

A2A1A

A

3

S

0

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

[4]

SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14

Figur e 3. Setting the SCSI ID on ST150176LW drives

SCSI ID = 15

Barr acuda 50 Instal lation Guide, Rev. A 19

2. Confi gure terminati on.

If you are ins tal ling the drive in a system t hat has other SCSI
devices installed, terminate only the end devices on the
SCSI bus.

Figur e 4 shows the three most common terminat ion configu­rations. ST150176LW drives do not have internal termina­tors or any other way of adding internal termination on the
drive. You must provide external termination to these drives
when termination is required. This is normally done by add­ing an in-line terminator on the cable. See Figure 9 on page
27 for an illustration showing a system configuration that
uses an in li ne terminator.

• Use active (ANSI SCSI-2 Alternative 2) single­ended terminat ors when t erminating a bus oper­ating in single-ended mode.

• Use SPI-2-compliant active low voltage differential termina­tors when terminating a SCSI Ultra2 bus operating in LVD
mode.

• 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.

20 Barr acuda 50 Instal lation Guide, Rev. A

Internal SCSI cable

Internal

SCSI device

Internal

SCSI drive

Internal SCSI cable

Internal

SCSI device

Internal SCSI cable

Internal

SCSI device

Terminate

Internal

SCSI device

Terminate

Controller

Terminate

Controller

Controller

External

SCSI
cable

External

SCSI device

External

SCSI device

Figure 4. SCSI bus termination

Barr acuda 50 Instal lation Guide, Rev. A 21

3. Confi gure terminati on power.

Terminators have to get power from some source. The
default conf iguration results in the drive not suppling ter mi­nation power to the bus. You should normally leave this
drive set at this default unless your host system requires
that the drive supply termi nation power to the bus.

To configure this drive to supply termination power to the
bus, place a jumper on J2 pins 1 and 2 as shown in the fig­ure below.

Pin 1

J2

SEDSMEWPP

D

R
E
S

Pin 2
R
EST

P

Term. Power to SCSI Bus
Host adapter or other device provides

term power to external terminator

J2 Jumper

(enlarged to

show detail)

J6

Drive
Front

J2

Figure 5. Setting terminator power jumpers

22 Barr acuda 50 Instal lation Guide, Rev. A

4. Connect t he drive activity r emo te LED (optional)

This drive provides connections for a remote drive activity
LED. This step is optional because the drive will work fine
without an LED connected, but many people find this to be
helpful to determine when the drive is actively reading or
writing dat a.

Most host systems provide this LED which is a small “bulb”
(actually a light-emitting diode) located on the host’s front
panel . Simply locate this LED and connect the attached pair
of wires to the pins on the driv e as shown in Figur e 6 below.

Drive
Front

Jumper Plug

(enlarged to
show detail)

Reserved
Activity LED

Reserved
The shaded pins are shipped
with a cover installed. Do not
install jumpers on these pins.
Retain the cover unless you
install a 20-pin plug.

J6

Pin 1

CATH

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

Figure 6. Drive Active LED indicator connections

Barr acuda 50 Instal lation Guide, Rev. A 23

5. Check the other available jumper settings (optional)

This drive provides several features for unique configura­tions. You will not normally need to change from the default
sett ings fo r normal operation. See Figure 7 on page 24.

Single-ended mode option

You can force the drive to operate only in SE mode by
installing a jumper on J2 pins 15 and 16. The default is to
allow the drive to automatically detect and use SE or LVD
mode. See page 11 for a descri ption of these two modes.

Del ay Motor St a rt a n d M o to r Start o p tions

You can control when the drive’s motor starts spinning the
media using these two jumper positions (J2 pins 11 and 12
and J2 pi ns 13 and 14). You can configure the dri ve to delay
spin ning up until a certain numbe r of seconds elapse or unt il
the drive receives a Start Unit command from the host sys­tem. The default settings are with both off so that the drive
begin s spinning up as soon as it receiv es power.

Write Protect option

You can install a jumper connect ing J2 pins 9 and 10 to pre­vent anyone from writing data to this disc drive (users can
still read data from the drive). This jumper is normally left off
to allow users to write data to the driv e.

Parity Chec k option

You can disable parity checking by installing a jumpers on
J2 pins 7 and 8. Most systems prefer that parity checking
remain enabled. Refer to your host adapter or system docu­mentation to determine whether your host adapter supports
parity checkin g.

24 Barr acuda 50 Instal lation Guide, Rev. A

J2

Reserved
Single-Ended Mode option

Use single-ended or low voltage differential mode.
Force the drive to operate only in single-ended mode.

Delay Motor Start option
(valid only if the Enable Motor Start jumper is not connected)

Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied by 12 seconds.

For example, if the SCSI ID = 2, the drive starts in 24 seconds.
Motor Start option

Disable motor start (default). The drive starts according to the
Delay Motor Start option.

Enable motor start. The drive waits for the Start Unit command
from the host before starting the spindle motor.

SEDSMEWPP

Pin 1

R
E

D

S

Pin 2
R
EST

P

Write Protect option
Write protect = Off (enables writing – default).
Write protect = On (disables writing).

Parity Check option
Enable parity check of SCSI bus (default).

Disable parity check.

J2 Jumper

(enlarged to

show detail)

J2

J6

Drive
Front

Figur e 7. Addit ional jumper options

Barr acuda 50 Instal lation Guide, Rev. A 25

6. Mount the drive in the host system and connect
cabling.

a. Mount the drive to the host system’s chassis using four

6-32 UNC sc rews. Two mounting holes are in ea ch si de
of the drive and there are four mounting holes in the
bottom of the drive. Do not over-tighten or force the
scre w if it does not seem to screw in easily. The dimen­sions of the drive are pr ovided in Figure 10.

b. Connect the SCSI cable into the dri ve’s SCSI connector

as illustrated in Figure 8 on page 26. Take care not to
stretch or crimp this cable, and do not block the sys­tem’ s air flow with th e cable . Figure 9 on page 27 shows
an example of how to connect multiple drives on the
same bu s.

c. Connect the DC power cable to the drive as illustrated

in Figure 8.

d. Replace the host system’s cover.

• Do n ot t o uc h t he co nn ec tor pi ns or any co m po­nents on the circuit board.

• Observe static-discharge precautions.

• Always handle the drive by the frame only.

• The drive may be mounted in any orientation; howev er, you
must ensure that the drive receives adequate air flow for
cooling.

7. Format the drive.

Follow the i nstructions on page 37 to format the driv e.

26 Barr acuda 50 Instal lation Guide, Rev. A

Power

Cable

Figur e 8. Connecting cables to the drive

Barr acuda 50 Instal lation Guide, Rev. A 27

“LW” Model

Drive

Terminator

[6]

SCSI devices [4]

[7]

2 through X

Pin 1

(check your

SCSI ID 1

[2]

SCSI ID 0

[2]

adapter for Pin 1 location)

SCSI ID 7 [5]

[1]

Host Adapter

PCB

[3]

[1] “X” means up to 15 devices on the SCSI bus.
[2] Exter nal terminator. Used only on end “LW” drive. Use only SPI-2-

compliant active LVD terminators on SCSI Ultra2 buses.

Figure 9. Multiple-drive connection to host adapter

28 Barr acuda 50 Instal lation Guide, Rev. A

K

-Z-T//

S

[1]

HL

J

B

R

A

-Z-

M

-X-

U

P

[1]

G

F

DE

-Z-

Notes:

Mounting holes are 6-32 UNC 2B, three

[1]

on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 6.0 in-lb (3.32 nm)
with minimum full thread engagement of

0.12 in. (3.05 mm).

Dimension Table

G

M

Inches

A

1.654

B

5.787

C

4.000

D

3.750
E
F

1.750

1.625
H

1.122

J

4.000
K
L

1.638

P

1.625
R
S
T
U

.125

.250
.181

.265
.315
.015
.015

max
max

± .010
± .010
± .010
± .010
± .020
± .020
± .010
± .010
± .010
± .020

± .020
± .010
± .040

max
max

Millimeters

42.01

147.00

101.60

92.25

3.18

44.45

41.28

28.50

101.60

6.35

41.60

4.60

41.28

6.73

7.00

0.38

0.38

± .25

± .25

max
max

± .25

± .25
± .50
± .50
± .25
± .25
± .25
± .50

± .50
± .25
± .10

max
max

Figure 10. Mounting configuration dimensi ons (LW model)

C

-X-

Barr acuda 50 Instal lation Guide, Rev. A 29

Additional connector on ST150176LW dr ives

ST150176LW drives have a connector located between the
SCSI I/O connect or and the DC power connector to allow you to
set the SCSI ID and connect LEDs from the back of the drive.
You are not require d to use this connector, but it’s available if you
want to use it. Ref er to Figure 11 for pin assignments.

68 Pin

SCSI I/O Connector

J1

Pin 1

J5/J1A [2][4]

Pin 1

1P2P3P4P

Pin 12

J1A Pin 1

SCSI Address A0
SCSI Address A1
SCSI Address A2

SCSI Address A3
No connection
+5V
Fault LED*
Vendor Unique*
Reserved
Activity LED*
Ground

These pins are driven low for

*

250 ms after PWR ON or
RESET to allow jumper
selectable SCSI ID as shown
to the right.

J1-DC Power

SCSI ID = 0
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

Figur e 11. Al ternate SCSI ID select and LED connection

30 Barr acuda 50 Instal lation Guide, Rev. A

ST150176LC installa tion

1. Set the SCSI ID on the drive.

Determine which SCSI IDs are already being used in the
system and then assign the 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 12).

• This drive is SCAM (SCSI Configured Auto Mat­ical ly ) com plia nt . If y ou ar e inst al li ng thi s dr iv e in
a SCAM compliant system, you can skip this

step because the system automatically assigns the drive
SCSI ID.

• The host system ’s SCSI c ontroll er us ually u ses SC SI ID 7
so this SCSI ID is not usually available for disc drives or
other de vices.

• Most ST150176LC drives are factory set with the SCSI ID
set at 0. If this is the only SCSI drive in your system and
there are no other SCSI devices on the daisychain, you can
leave this drive’s SCSI ID set to 0 and proceed to the next
step. A de vice is any hardware other tha n an inlin e termin a­tor that is connected to the SCSI cable.

Barr acuda 50 Instal lation Guide, Rev. A 31

Drive
Front

Jumper Plug

(enlarged to
show detail)

Pin 1

[1]

J6

SCSI ID = 0
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

Figure 12. Setting t he SCSI ID on ST150176LC drives

SCSI ID = 15

32 Barr acuda 50 Instal lation Guide, Rev. A

2. Confi gure terminati on.

ST150176LC drives are designed for installation in host sys­tems that have a backplane with single connector attach­ment (SCA) connections. Termination is normally provided
on this backplane. Check your host system documentation
for deta ils.

• You can use t his drive in host systems t hat do
not have a backplane with SCA connectors by
using a SCA to wide SCSI-2 adapter. These

adapters separate the interface lines from the power lines. If
you use such an adapter, proceed with step 2 of the installa­tion instruction s provided for ST150176LW drives.

Note. Host systems designed to use ST150176LC drives nor-

mally provide ter mination power from the host adapter or
other source. ST150176LC drives cannot be configured
to pro vide terminatio n power to the bus.

Barr acuda 50 Instal lation Guide, Rev. A 33

3. Check the other available jumper settings (optional)

This drive provides several features for unique configura­tions. You will not normally need to change from the default
sett ings fo r normal operation. See Figure 13 on page 34.

Single-ended mode option

You can force the drive to operate only in SE mode by
installing a jumper on J2 pins 15 and 16. The default is to
allow the drive to automatically detect and use SE or LVD
mode. See page 11 for a descri ption of these two modes.

Del ay Motor St a rt a n d M o to r Start o p tions

You can control when the drive’s motor starts spinning the
media using these two jumper positions (J2 pins 11 and 12
and J2 pi ns 13 and 14). You can configure the dri ve to delay
spin ning up until a certain numbe r of seconds elapse or unt il
the drive receives a Start Unit command from the host sys­tem. The default settings are with both off so that the drive
begin s spining up as soon as it rec eives power.

Write Protect option

You can install a jumper connect ing J2 pins 9 and 10 to pre­vent anyone from writing data to this disc drive (users can
still read data from the drive). This jumper is normally left off
to allow users to write data to the driv e.

Parity Chec k option

You can disable parity checking by installing a jumpers on
J2 pins 7 and 8. Most systems prefer that parity checking
remain enabled. Refer to your host adapter or system docu­mentation to determine whether your host adapter supports
parity checkin g.

34 Barr acuda 50 Instal lation Guide, Rev. A

J2

Reserved
Single-Ended Mode option

Use single-ended or low voltage differential mode.
Force the drive to operate only in single-ended mode.

Delay Motor Start option
(valid only if the Enable Motor Start jumper is not connected)

Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied by 12 seconds.

For example, if the SCSI ID = 2, the drive starts in 24 seconds.
Motor Start option

Disable motor start (default). The drive starts according to the
Delay Motor Start option.

Enable motor start. The drive waits for the Start Unit command
from the host before starting the spindle motor.

SEDSMEWPP

Pin 1

R
E

D

S

Pin 2
R
EST

P

Write Protect option
Write protect = Off (enables writing – default).
Write protect = On (disables writing).

Parity Check option
Enable parity check of SCSI bus (default).

Disable parity check.

J2 Jumper

(enlarged to

show detail)

J2

J6

Drive
Front

Figur e 13. Additional jumper options

Barr acuda 50 Instal lation Guide, Rev. A 35

4. Mount the dri ve in the host syste m.

To mount an “LC” drive, plug the drive into the system’s sin­gle connector attachment (SCA) position on the system’s
backplane. The SCA connector on the drive contains inter­face and power functions, so it does not require a separate
power connector. The dimensions of the drive are provided
in Figure 15.

Some host systems require that you first mount the drive to
a sliding tray or cour ier before inserting it into the system.

This drive model plugs directly into a backplane connector
and ther efore does not use cables.

80-pin

SCSI I/O

Connector

Pin 1

J2

J6

Figure 14. 80-pin I /O connection to drive (LC model)

36 Barr acuda 50 Instal lation Guide, Rev. A

K

-Z-T//

S

[1]

HL

J

B

R

-Z- -X-N

A

-Z-

M

-X-

U

P

[1]

G

F

-Z-

Notes:

Mounting holes are 6-32 UNC 2B, three

[1]

on each side and four on the bottom.
Max screw penetration into side of drive
is 0.15 in. (3.81 mm). Max screw
tightening torque is 6.0 in-lb (3.32 nm)
with minimum full thread engagement
of 0.12 in. (3.05 mm).

Dimension Table

M

A
B
C
D
E

G
H

K

N
P
R
S

U

Inches

1.654

5.787

4.000

3.750

F

1.750

1.625

1.122

J

4.000

L

1.638

1.625

2.618

T

.125

.250
.181

.040

.276
.015
.015

max
max

± .010
± .010
± .010
± .010
± .020
± .020
± .010
± .010
± .010
± .020

max

± .020
± .010
± .040

max
max

Millimeters

42.01

147.00

101.60

92.25

3.18

44.45

41.28

28.50

101.60

6.35

41.61

4.60

1.20

41.28

66.50

7.00

0.38

0.38

max
max

± .25

± .25

± .25

± .25
± .50
± .50
± .25
± .25
± .25
± .50

max

± .50
± .25
± 1.02

max
max

Figure 15. Mounting configuration dimensi ons (LC model)

DE

C

-X-

Barr acuda 50 Instal lation Guide, Rev. A 37

5. Format the drive.

Cauti on.

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.
Seagate is not responsible for lost user data.

Formatting a drive erases all user

Important informati on about formatting the drive

• The drive has been low level formatted at the factory.
You do not need to perform another low level for mat on
this drive unless you decide to perform cer tain diagnos­ti cs thr ough the host adapter .

• If you do decide to perform a low level format, do not
abort the format as this is likely to make the drive inoper­able. A low level format will typically take less than 30
minutes.

• Protect against power failure or other power interrup­ti ons duri ng the format.

Barracuda 50 disc drives are designed to operate with a
variety of operating systems. Some brief instructions are
provided below for DOS, Windows 3.1, Windows 95, Win­dows 98, and Macintosh systems. For more detailed instruc­tions, or if your operating system is not covered by these
instructions, please refer to your operating system or drive
uti li ty documentat ion.

38 Barr acuda 50 Instal lation Guide, Rev. A

Note. Hardware platform, operating system, and host

adapter variations ca n limit acc ess to the ful l capac­ity of this and other high capacity drives. Refer to
your system, host adapter, or drive utility d o c um e n­tation for detailed i nstructions.

DOS, Windows 3. 1, Windows 95, and Windo ws 98

Syst e m pr epara t ion

a. Turn your computer on. As your computer starts up,

watch the screen for a message describing how to run
the system setup program (sometimes called BIOS or
CMOS setup). This is usually done by pressing a spe­cial key, such as

DELETE, ESC

, or F1 during startup.
See your compute r manual for det ails. Press the appro ­priate key to run the system se tup progr am .

b. Set the drive type in your BIOS or CMOS setup to

“Zero,” None,” or “No hard drive installed” and then
save and exit f rom your setup program.

Drive partitioning

Partitioning a hard drive divides it into sections (partitions)
that act as separate logical drives (labeled C, D, E, et.). To
partition your new drive:

a. Insert a boot able DOS diskette into your di skette drive-

and rest art yo ur com puter.

b. Insert a DOS program diskette that contains the

fdisk.exe and format.com programs into your diskette
drive. At the

c. If you have two hard drives installed, the fdisk menu

displays five options. Option five allows you to select

prompt, type fdisk and press

A:

ENTER

.

Barr acuda 50 Instal lation Guide, Rev. A 39

the drive you want to partition. Mak e sure that your new
drive is selected. If you accidently repartition your old
hard drive, you will arase all data on the drive.

d. Press

drive” and then press the

e. Press

and then press the

to select “Create DOS partition or logical DOS

1

ENTER

again to select “Create primary DOS partition”

1

ENTER

key. Create your first drive

key.

partition.
If you are creating a partition that will be used to boot
your computer (dri ve C:), mak e sure that the partition is
marked

active

.

f. Create an extended partition and additional logical

drives, if necessary, until all the space on your n ew hard
drive has been partioned.

g. When the partitioning is complete, fdisk reboots your

computer.

Drive formatting

a. At the A: prompt, type

your new partition. If this i s your boot drive, type

x: /s

. Make sure you use the correct drive letter. If you

fo rmat x

where x is the letter of

format

format a drive that already contains data, you will erase
all dat a on the drive.

b. Repeat this process for all the new partitions you have

created.

After you format your new drive, it is ready to use. You’re
done!

40 Barr acuda 50 Instal lation Guide, Rev. A

Macintosh

Use a th ird-p a rty d rive u t ility to initialize t h e d r ive a n d follo w
the instructions provided with the utility. Note: versions of
Apple Drive Setup prior to version 1.3.1 do not recognize
non-Apple drives.

Barr acuda 50 Instal lation Guide, Rev. A 41

Seagate Technology support services

Online Serv ices

Internet

For online information about Seagate products, visit
www.seagate.com or e-mail your disc or tape questions to:

Presales Support:

Disc: http://www.seagate.com/support/email/

email_presales.shtml

Tape: http:// www.seag ate.com/ support/email/

email_tape_presales.s html
[e-mail]

Technical Support

Disc: http://www.seagate.com/support/email/

email_disc_support.shtml

Tape: http:// www.seag ate.com/ support/email/

email_tape_support.sht m l

SeaBOARD®

information about Seagate disc and tape drive products and is
available 24 hours daily. Set your communications software to
eight data bits, no par ity and one stop bit (8-N-1). This ser vice is

:

is a computer bulletin board system that contains

or

DiscPres ales@Seagate .com

or

or

DiscSupport@Seagat e.com

or

[e-mail]

avail a bl e wor l d w ide .

Automa ted Services

SeaFONE

800-732-4283) to access our automated self-help services.
Using a touch-tone phone, you can find answers to service

1-800-SEAGATE)

® (

is Seagate's toll-free number (1-

42 Barr acuda 50 Instal lation Guide, Rev. A
phone numbers, commonly asked questions, troubleshooting

tips and specifications for disc drives and tape drives 24 hours
daily. International callers can reach this service by dialing +1­405-936-1234.

SeaFAX

®

is Seagate's automated FAX delivery system. Using a
touch-tone phone, you can obtain technical suppor t information
by return FAX 24 hours daily. This service i s available worldwi de.

Presales Suppor t

Our Presales Support staff can help you determine which
Seagate products are best suited for your specific applicat ion or
computer system.

Seagate Express

You can purchase select tape products and tape accessories
through Seagate Express 24 hours daily by calling 1-800-531­0968 or by fa xing your order to: [phone].

Technical Support

If you need help 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 help, you ca n talk to a Seagate technical suppo rt
specialist. Before calling, note your system configuration and
drive m odel number (ST

SeaTDD™([phone])

for the deaf (TDD). You can send questions or comments 24
hours daily and exchange messages with a technical support

xxxxx).

is a telecommunications device

Barr acuda 50 Instal lation Guide, Rev. A 43
specialist from 8:00 A.M. to 12:15 P.M. and 1:30 P.M. to 6:00

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

Custo mer S er vice (CSO )

Warra nty Repair

Seagate offers worldwide customer support for Seagate drives.
Seagate direct OEM , Di stri bution and System Integrator cust om ­ers should contact their Seagate service center representative
for warranty information. Other customers should contact their
plac e of purchase.

Authorized Service Centers

If your live outside the U.S., you can contac t an Authorized Ser­vice Cent e r for servi ce or repair.

USA/Canada/Latin America Support Services

Presales Supp or t

Disc:

Tape:

Technica l Su ppor t (Se aFONE )

1-800-SEAGATE or [phone] (for specific product
phone number)

1-877-271-3285 or FAX: [phone]
[phone]

1-800-626-6637 or FAX: [phone]
[phone]

FAX:

SeaFAX 1-800- SEAGATE
SeaTDD [phone]
SeaBOARD

Disc: +

1-405-936-1685;

Disc: +

Tape:

1-405- 936-1600;

[phone]

Tape:

[phone]

44 Barr acuda 50 Instal lation Guide, Rev. A

Warra nty Repair

USA/Canada 1-800-468-3472 FAX: [phone]
Lati n Americ a [phone] FAX: [phone]

Authorized Service Centers

Brazil

MA Informatica

[phone] FAX: [phone]

Canada

Memofix
Adtech

[phone] FAX: [phone]
[phone] or FAX: [phone]
1-800- 624-9857

European Support Services

For European customer support, dial the toll-free number for
your specific country for presales support, technical support,
SeaFAX and warranty repair.

If your country is not listed here, dial our European call center at
[phone] from 8:30
time) Monday through Friday. The European call center is

A.M

. to 5:00 P.M. (European central

loca ted in Amsterdam, The Netherlands.

Call Center

Austria 0 800-20 12 90
Belgium 0 800-74 876
Denmark 80 88 12 66
France 0 800-90 90 52
Germany 0 800-182 6831
Ire land 1 800-55 21 22
Ita ly 1 677 90 695
Netherlands 0 800-732 4283

Barr acuda 50 Instal lation Guide, Rev. A 45
Norway 800-113 91

Poland 00 800-311 12 38
Spain 900-98 31 24
Sweden 0 207 90 073
Swit zerland 0 800-83 84 11
Turkey 00 800-31 92 91 40
Unit ed Kingdom 0 800-783 5177

SeaBOARD

Germany [phone]

Fax Services—All European Countries

Presal es/Technical Support/W arranty Repair [phone]

Africa/Middle East Suppor t Services

For presales, technical support, warranty repair and FAX ser­vice s in Africa and the Middl e East, dial our Euro pean call center
at [phone] from 8:30 a.m. to 5:00 p.m. (European cen­tral time) Monday through Friday, or send a FAX to +31-20-653-

3513. The European call center is located in Amsterdam, The
Netherlands.

Asia/Pa cific East Support Services

Technica l Su ppor t

Austra li a [phone] FAX: [phone]
Hong Kong [phone] FAX: [phone]
Japan — FAX: [phone]
Singap ore [phone] FAX: [phone]
Taiwan [phone] FAX: [phone]

46 Barr acuda 50 Instal lation Guide, Rev. A

SeaFAX

Austra li a [phone]

Warra nty Repair

Japan [phone] FAX: [phone]
Asia/Pacific and [phone] FAX: [phone]

Australia

Seagate Technol ogy , Inc.
920 Disc Dri ve, Scot ts Valle y, CA 95066-4544, USA

Publ ication Number: 83329472, Rev. A, Printed in USA