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BARRACUDA 2LP
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Disc Drive
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ST31250N/ND
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ST31250W/WD/WC/DC
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ST32550N/ND
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ST32550W/WD/WC/DC
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Installation Guide
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Contents
Preface .................................................................. 1
Electrostatic discharge protection ........................... 1
Important safety information and precautions ......... 2
Wichtige Sicherheitshinweise............................... 5
Technical support services ..................................... 10
General description ................................................ 13
Initial setup information........................................... 19
Kühlung des Systems .......................................... 24
© 1995 Seagate Technology, Inc. All rights reserved
Publication Number: 83328920, Rev. E
October1995
Seagate®, Seagate Technology®, and the Seagate logo
are registered trademarks of Seagate Technology, Inc.
Barracuda™, SeaF AX™, SeaFONE™, Sea TDD™, and
SeaBOARD™ are trademarks of Seagate Technology,
Inc. Other product names are r egistered trademarks or
trademarks of their owners.
No part of this publication may be reproduced in any
form wi thout w ritten p ermission f rom Se agat e T echnology, Inc.
Barracuda 2LP Installation Guide, Rev. E 1
Preface
This manual contains information for users of the
Seagate® ST31 250 and ST32550 Barracuda™ 2LP SCSI
disc drives. It provi des support services, performa nce
specifications, and initial set up info rmation. Ad ditional
information is available in the
Manual
sales representative if you need to order this publi cation.
Electrostatic discharge protection
Caution. Removal of circuit boards by personnel not
All drive electronic assemblies are sensitive to static
electricity, due to the electrostatically sensitive devices
used within the drive circuitry. Although some devices
such as metal-oxide semiconductors are extremely
sensitive, all semiconductors, as we ll as some resist ors
and capacitors, may be damaged or degraded by ex posure 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:
(part number 83328930). Contact your Seagate
performing depot repair will damage components and may void the warranty.
Barracuda 2LP Product
2 Barracuda 2LP Installation Guide, Rev. E
• Ground yourself to the drive whenever the drive elec-
tronics 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 static electricity from 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 and repair techniques for safe, reliable
operation of this unit. Service should be done only by
qualified persons. We recommend the procedures in this
manual as effective ways of servicing the unit. Some
procedures require the use of special tools. For proper
maintenance and safety, you must use these tools as
recommended.
Barracuda 2LP Installation Guide, Rev. E 3
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 others. The cautions
point out conditions or practices that may damage the
unit, possibly making it unsafe for use.
These warnings and cautions are not exhaustive. We
cannot possibly know, evaluate, and advise you of all the
ways in which maintenance might be performed or the
possible risk of each technique. Consequently, we have
not completed any such broad evaluation. If you use a
non-approved procedure or tool, first ensure that the
method you choose will not risk either your safety or unit
performance.
Always observe the following warnings and precautions:
• Perform all maintenance by following the procedures in
this manual.
• Follow all cautions and warnings in the procedures.
• Use sound safety practices when operating or repairing
the unit.
• Use caution when troubleshooting a unit that has
voltages present. Turn off power to the unit before
servicing it.
• Wear safety shoes when removing or replacing heavy
parts.
4 Barracuda 2LP Installation Guide, Rev. E
• 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 usually
highest.
• Follow the precautions listed above in “Electrostatic
discharge protection.”
• Do not remove any circuit boards from the drive chas-
sis. Return the entire drive for depot repair if any circuit
board is defective. Removal of circuit boards by person-
nel not performing depot repair will damage compo-
nents and may void the warranty.
• Do not remove the head and disc assembly (HDA) from
the drive chassis. Return the entire drive for depot repair
if the HDA is defective.
• Do not attempt to disassemble the HDA. It is not field
repairable. If the sealed HDA is opened by personnel
not performing depot repair, this will damage compo-
nents and void the warranty.
As a component, this drive is designed to be installed and
operated in accordance with UL1950, IEC950, EN60950,
CSA C22.2 950, and VDE0805.
Seagate takes all reasonable steps to ensure that its
products are certifiable to currently accepted standards.
Barracuda 2LP Installation Guide, Rev. E 5
Typical applications of these disc drives include cus-
tomer packaging and subsystem 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
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- und
Reparaturverfahren, um den sicheren, zuverlässigen
Betrieb dieser Einheit zu gewährleisten. Reparaturen
dürfen nur von qualifiziertem Fachpersonal vorgenommen
6 Barracuda 2LP Installation Guide, Rev. E
werden. Wir empfehlen die Verfahren in diesem Handbuch
als effektive Methoden zur Wartung und Reparatur der
Einheit. Einige Verfahren erfordern Spezialwerkzeuge;
diese müssen zur sachgemäßen Ausführung der
Wartungsarbeiten und aus Sicherheitsgründen den
Empfehlungen entsprechend verwendet werden.
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 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
Barracuda 2LP Installation Guide, Rev. E 7
persönliche Sicherheit noch die Leistung der Einheit
gefährdet.
Beachten Sie in jedem Fal l d ie f olge nden War n-un d
Vorsichtshinweise:
• Führen Sie alle Wartungsarbeiten entsprechend den
Anweisungen in diesem Handbuch aus.
• Beachten Sie alle Warn- und Vorsichtshinweise in
diesem Handbuch.
• Treffen Sie beim Betrieb oder bei der Reparatur der
Einheit angemessene Sicherheitsvorkehrungen.
• Wenn eine Einheit unter Spannung steht, gehen Sie bei
der Fehlerdiagnose besonders vorsichtig vor. Schalten
Sie die Einheit aus, bevor Sie mit den Reparaturarbeiten
beginnen.
• Tragen Sie Sicherheitsschuhe, wenn Sie schwere Teile
aus- bzw. einbauen.
• 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.
8 Barracuda 2LP Installation Guide, Rev. E
• Befolgen Sie die oben unter “Electrostatic Discharge
Protection” angegebenen Sicherheitsmaßnahmen.
• Nehmen Sie keine Platinen aus dem Laufwerkgehäuse.
Wenn eine Platine defekt ist, muß das gesamte Laufwerk
zur Reparatur eingeschickt werden. Die Herausnahme
von Platinen durch anderePersonen als die für die
werkseitige Reparatur zuständigen kann zu einer
Beschädigung der Komponenten und Erlöschen des
Garantieanspruchs führen.
• Die vormontierte Kopf- und Festplatteneinheit (HDA)
nicht aus dem Laufwerkgehäuse nehmen! Falls die
HDA beschädigt ist, schicken Sie das gesamte
Laufwerk zur Reparatur ein.
• Die HDA ist nicht vor Ort reparierbar und darf nicht
auseinandergenommen werden! Öffnen der
versiegelten HDA durch andere Personen als die für die
werkseitige Reparatur zuständigen hat eine
Beschädigung der Komponenten und Erlöschen des
Garantieanspruchs zur Folge.
Als Teilkomponente ist dieses Laufwerk für die Installa-
tion und den Betrieb in Übereinstimmung mit UL 1950,
IEC950, EN60950, CSA C22.2 950 und VDE0805
vorgesehen.
Seagate ist ständig bemüht, die Zulassungsfähigkeit von
Seagate-Produkten im Rahmen der gegenwärtig
Barracuda 2LP Installation Guide, Rev. E 9
geltenden Standards zu gewährleisten. Zu den typischen
Anwendungen dieser Festplattenwerke 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
Vorschriften in ihren Endprodukten und - falls gesetzlich
vorgeschrieben - für die Zulassung zu schaffen.
Eine Grundvoraussetzung zur Einhaltung der
Sicherheitsanforderungen ist die Bereitstellung
eines Überlastschutzes für die SELVVersorgungsspannungen 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 elektromagnetische
Strahlung sind für Designer von Untersystemen auf
Anfrage von der Seagate-Sicherheitsabteilung erhältlich.
10 Barracuda 2LP Installation Guide, Rev. E
Technical support services
Seagate Technology provides technical support literature and diagnostic utilities to authorized distributors.
Please contact your dealer for technical support and
installation troubleshooting. Product technical support is
available for all Seagate products by calling the SeaFAX™,
SeaFONE™, SeaTDD™, or SeaBOARD™ services.
These are toll calls if you dial from outside of the number’s
local dialing area.
SeaFAX:
USA (408) 438-2620; England 44-62-847-7080
Use a touch-tone telephone to access Seagate’s automated FAX system and select technical support information by return FAX. This service is available 24 hours a
day, 7 days a week.
CompuServe Forum
Online support for Seagate products is available on
CompuServe. This includes an extensive question and
answer message base, downloadable utilities, and documentation files in Adobe™ Acrobat™ format which you
can download and view from your own computer. Type
“Go Seagate” from within CompuServe to access this
service.
Barracuda 2LP Installation Guide, Rev. E 11
SeaFONE: (408) 438-8222
Technical support specialists are available from 8:00 A.M.
to 5:00 P.M. PST, Monday through Friday. Recorded
technical information on selected Seagate products is
provided while you are on hold. Recordings are accessible 24 hours a day, 7 days a week.
SeaTDD: (408) 438-5382
TDD is a telecommunication device for the deaf where
two people can communicate using a keyboard connected to the phone line. A TDD device is required to
access this service, which is available from 8:00 A.M. to
5:00 P.M. PST, Monday through Friday.
SeaBOARD:
The Seagate Technical Support Bulletin Board System
(BBS) is available 24 hours a day, 7 days a week. A
modem is required to access this service. The communications software must be set for eight data bits, no parity,
and one stop bit (8N1). These operate at 300 to 9600
baud. With this service you can access:
• Specifications and jumper configurations
• Reprints of Seagate documentation
• Utilities that you can download to your own computer
12 Barracuda 2LP Installation Guide, Rev. E
Location Modem number
USA, Mexico, Latin America (408) 438-8771
England 44-62-847-8011
Germany 49-89-140-9331
Singapore 65-292-6973
Australia 61-2-756-2359
Canada (416) 856-5581
France 33-1-40-67-1034
Korea 82-2-556-7294
Barracuda 2LP Installation Guide, Rev. E 13
General description
Barracuda 2LP 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 emissions. The
racuda 2LP Product Manual
(part number 83328930)
contains guidelines for a properly designed enclosure.
SCSI I/O
Connector
Bar-
DC Power Connector
Figure 1. Barracuda 2LP disc drive (N/ND model shown)
14 Barracuda 2LP Installation Guide, Rev. E
Characteristics ST31250 ST32550
Interface Fast SCSI-2
1
Fast SCSI-2
Capacity
Unformatted 1,205.3 Mbytes 2,541.3 Mbytes
Formatted
2
1,020.9 Mbytes 2,147.4 Mbytes
Recording
Cylinders (user) 3,711 3,510
Read/write data heads 5 11
Servo heads 1 1
Avg bytes/track 64,160 64,160
Seek time
3
Average read 8.0 msec 8.0 msec
Average write 9.0 msec 9.0 msec
Disc rotation
RPM 7,200 7,200
Average latency 4.17 msec 4.17 msec
Internal transfer rate 47.5 to 72.0 49.4 to 72.0
(Mbits/sec)
Max sync. SCSI transfer rate
N/ND 10 Mbytes/sec 10 Mbytes/sec
W/WD/WC/DC 20 Mbytes/sec 20 Mbytes/sec
Multi-segmented cache 512 Kbytes 512 Kbytes
1
Barracuda 2LP Installation Guide, Rev. E 15
1
Can also be operated according to SCSI-1 protocol.
2
Standard factory units are formatted as follows:
512 data bytes per sector
9 spare sectors per cylinder
3
Not including on-board controller overhead.
1 cylinder at the innter track reserved for spares
16 Barracuda 2LP Installation Guide, Rev. E
DC power requirements
Single-ended Differential
11
Voltage regulation
++
+5V
5
++
±±
± 5%
±±
++
+12V
++
±±
± 5%
±±
2
Amps
Maximum operating current10.93 0.6 1.17 0.6
Maximum starting current
Peak DC
Peak AC
Delayed motor start (max)
Peak operating current
Typ DC
Max DC
3, 6
3
1, 10
1
0.93 1.35 1.00 1.35
− 1.93 − 1.93
1,4
0.88 0.12 0.92 0.12
0.91 0.57 1.13 0.57
0.93 0.60 1.17 0.60
Max (peak) 1.00 1.56 1.95 1.56
Track following (DC)
Read track
at OD
1
at ID
OD DC
1
1, 14
0.91 0.5 0.99 0.50
0.88 0.51 0.96 0.51
0.96 0.53 1.35 0.53
AC 1.03 0.73 1.95 0.73
Seeking
Typical DC
Maximum DC
1, 13
1
0.89 0.78 0.99 0.78
0.92 0.82 1.10 0.82
Maximum (peak) AC 0.95 1.60 1.67 1.60
++
+5V
++
±±
± 5%
±±
11
++
+12V
++
±±
± 5%
±±
2
Barracuda 2LP Installation Guide, Rev. E 17
1
Measured with an average reading DC ammeter. Instantaneous +12V current peaks will exceed these values.
2
A −10% tolerance 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
Manual
4
This condition occurs when the Motor Start option is enabled
(publication number 83328930).
and the drive has not yet received a Start Motor command.
5
See “Conducted noise immunity” in the
Product Manual.
The specified voltage tolerance is inclusive
of ripple, noise, and transient response.
6
At power-up, the motor current regulator limits the +12V
current to an average value of less than 1.4A, although
instantaneous peaks may exceed this value. These peaks
should measure 5 msec duration or less.
7
Minimum current loading for each supply voltage is not less
than 4% of the maximum operating current shown.
8
Use separate ground returns for +5 and +12V supplies.
9
Where power is provided to multiple drives from a common
supply, carefully consider individual-drive power requirements. Where multiple units are powered on simultaneously,
be sure the peak starting current is available to each device.
10
Operating condition is a third-stroke seek at OD and read
one Track. The command is issued every 0.075 seconds
(every 0.063 seconds on wide and SCA drives).
Barracuda 2LP Product
Barracuda 2LP
18 Barracuda 2LP Installation Guide, Rev. E
11
No terminator power. See Section 11.7.3.4 in the
cuda 2LP Product Manual.
12
All power-saving features are enabled (ASA II code only).
13
Seeking is defined as a third-stroke seek at OD. The command is issued every 20 msec.
14
Read track is defined as repeat reads of track 15 with a
78% duty cycle on N models, 32% duty cycle on W
models, 48% duty cycle on WC models, 60% duty cycle
on ND models, 44% duty cycle on WD models, and 44%
duty cycle on DC models.
Barra-
Barracuda 2LP Installation Guide, Rev. E 19
Initial setup information
The general information beginning on this page applies to
all of the Barracuda 2LP drive models. After reading the
general information topics, refer to the appropriate drivespecific section listed below for additional information
about configuring and installing your particular model.
Drive models Page
ST31250N ST31250ND 33
ST32550N ST32550ND
ST31250W ST31250WD 38
ST32550W ST32550WD
ST31250WC ST31250DC 44
ST32550WC ST32550DC WC drives
General information
The following general information topics are discussed:
• SCSI ID jumpers
• Drive termination
• Synchronizing spindles
• Other applicable jumper options
• Providing adequate cooling
• Mounting the drive and connecting cables*
• Formatting the drive
20 Barracuda 2LP Installation Guide, Rev. E
*This 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.
SCSI ID jumpers
Each device on the SCSI chain must have a unique SCSI
ID. The host system’s SCSI controller usually uses the
highest-numbered ID available; therefore the lower-numbered SCSI IDs are normally used for the 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.
Most Barracuda disc drives are factory set with the SCSI
ID set at 0. To change the SCSI ID, refer to the appropriate drive section for your model.
If, after completing the installation process, the drive’s
LED does not show on/off activity when the host is trying
to communicate with the drive, a duplicate SCSI ID may
be the problem. If this is the case, change the ID so that
each device on the SCSI chain has its own unique ID.
Barracuda 2LP Installation Guide, Rev. E 21
Also check your system or controller user’s manual to
ensure that you have not violated its SCSI ID numbering
recommendations.
Drive termination
If you are installing a Barracuda 2LP drive in a system that
has other SCSI devices installed, terminate only the end
devices on the SCSI chain. A SCSI “device” is any disc
drive, scanner, tape-backup unit, or other piece of hardware connected to your system using the SCSI bus.
The top example in Figure 2 shows an internal hard disc
at one end of the SCSI bus with the SCSI controller at the
other end (both are terminated). The bottom example
shows two additional SCSI devices connected externally—this means the SCSI controller is no longer on the
end of the SCSI chain and should not be terminated.
Internal SCSI cable
Internal
SCSI device
Internal
SCSI device
Internal SCSI cable
Internal
SCSI device
Internal
SCSI device
Terminate
Controller
Terminate
Figure 2. SCSI bus termination
Controller
External
SCSI
cable
External
SCSI device
External
SCSI device
22 Barracuda 2LP Installation Guide, Rev. E
For information about how to terminate your drive, refer
to the appropriate drive-specific section.
Terminator power
You usually will not need to change this option and can
normally leave the drive configured as it was shipped
from the factory. For information about how to change the
terminator power option on your drive, refer to the appropriate drive-specific section.
Synchronizing spindles
If you are installing two or more Barracuda drives, you
may (optionally) synchronize their spindles to reduce the
latency associated with switching from one drive to
another. Spindle sync cables are used to connect the
drives.
After connecting each drive with spindle sync cables,
designate a master spindle sync reference source. This
master source is normally a disc drive located on the
same SCSI bus as the other drives you want to synchronize with. To designate a drive as the master, use SCSI
interface commands. Refer to the product manual for
information about using these commands.
For information about how to synchronize the spindles for
your drive, refer to the appropriate drive-specific section.
Barracuda 2LP Installation Guide, Rev. E 23
Providing adequate cooling
The enclosure design must ensure adequate cooling for
the drive. The maximum ambient temperature is 50oC.
The drive’s pr oduct manual (83328930) describes how
to e va luate the air-f low design . The ev al uation consist s
of ensuring that the case temperatures of certain critical
components remain within acceptable limits during drive
operation.
We recommend orienting the drive or directing the air
flow in a way that creates the least amount of air-flow
resistance while providing air flow above the circuit
boards and around the head and disc assembly (HDA).
Also, choose the shortest possible path between the air
inlet and exit. This minimizes the distance traveled by air
that i s heated by t he drive an d by other near by heat
sources.
Figure 3 shows two design approaches with one or more
fans used to generate air flow. The air-flow patterns can
be created by the fans either pushing or drawing air . The
overall flow pattern can be directed from front to back,
back to front, or side to side.
24 Barracuda 2LP Installation Guide, Rev. E
Kühlung des Systems
Die Gehäusekonstruktion muß eine ausreichende
Kühlung des Laufwerkes gewährleisten. Die
Umgebungstemperatur darf maximal 50oC betragen.
Die Produkthandbuch Barracuda 2LP (Dokument
83328930) enthalten Anweisungen zur Beurteilung der
Luftstromkonstruktion. Die Beurteilung muß sicherstellen,
daß sich die Gehäusetemperatur bestimmter kritischer
Komponenten bei Laufwerkbetrieb innerhalb
zugelassener Grenzen hält.
Wir empfehlen, das Laufwerk so zu orientieren oder den
Luftstrom so zu lenken, daß der geringste
Luftstromwiderstand erzeugt wird und gleichzeitig ein
Luftstrom über den Platinen und um die Kopf- und
Festplatteneinheit (HDA) gegeben ist. Wählen Sie einen
möglichst kurzen Weg zwischen Lufteinlaß und -auslaß.
Dadurch wird die Strecke, die die vom Laufwerk und
anderen nahegelegenen Hitzequellen aufgewärmte Luft
zurücklegt, auf ein Minimum beschränkt.
Abbildung 3 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.
Barracuda 2LP Installation Guide, Rev. E 25
Above unit
Über der Einheit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Hinweis. Luftstrom in der angezeigten Richtung
(von vorne nach hinten) oder in umgekehrter
Richtung (von hinten nach vorne)
Note. Air flows in the direction shown or
in reverse direction (side to side)
Hinweis. Luftstrom in der angezeigten Richtung oder in
umgekehrter Richtung (von Seite zu Seite)
Figure 3. Suggested air flow
Abbildung 3. Empfohlener Luftstromverlauf
Under unit
Unter der Einheit
Above unit
Über der Einheit
Under unit
Unter der Einheit
26 Barracuda 2LP Installation Guide, Rev. E
Mounting the drive and connecting cables
Do not touch the connector pins or any components on
the control board without observing static-discharge precautions. Always handle the drive by the frame only.
The drive may be mounted in any orientation (horizontally, vertically, and any combination thereof); however,
you must ensure that the drive receives adequate air flow
for cooling.
1. Mount the drive to the host system’s chassis using four
6-32 UNC screws. Two mounting holes are in each
side of the drive and there are four mounting holes in
the bottom of the drive.
The maximum length that the screws should extend
into the chassis mounting holes is 0.15 inch (3.81
mm), mea sured from the outer surface of the chassis.
Tighten the screws down evenly. Do not over-tighten
or force the screw if it does not seem to screw in easily,
because this means the threads are not properly
aligned. In this case, back the screw out and try again.
Barracuda 2LP Installation Guide, Rev. E 27
Installation des Laufwerkes
und Anschluß der Kabel
Beachten Sie beim Handhaben und Anfassen der
Anschlußstifte und Komponenten die
Vorsichtsmaßnahmen zur Verhinderung statischer
Aufladung. Fassen Sie das Laufwerk nur am Rahmen an.
Das Laufwerk kann in beliebiger Orientierung (horizontal,
vertikal oder schräg) installiert werden; jedoch muß dafür
gesorgt werden, daß ein ausreichender Luftstrom zur
Kühlung des Laufwerkes vorhanden ist.
1. Befestigen Sie das Laufwerk mit vier 6-32-UNC-
Schrauben am Gehäuse des Host-Systems. Die beiden
Seiten des Laufwerkes sind mit jeweils zwei
Befestigungslöchern versehen, die Unterseite des
Laufwerkes weist vier weitere Befestigungslöcher auf.
Gemessen von der Außenfläche des Gehäuses dürfen
die Schrauben maximal 3,81 mm in die
Befestigungslöcher des Gehüuses hineinragen. Die
Schrauben müssen gleichmäßig, jedoch nicht zu fest,
angezogen werden. Wenn sich eine Schraube nicht
ohne Widerstand einschrauben läßt, sind die Gewinde
nicht korrekt aneinander ausgerichtet. In diesem Fall
die Schraube nicht in das Gewindeloch forcieren,
sondern die Schraube herausnehmen und erneut in
das Gewindeloch einführen.
28 Barracuda 2LP Installation Guide, Rev. E
2. Verify that all connections between the drive and the
host system are correctly installed.
2. Prüfen Sie, ob alle Verbindungen zwischen dem
Laufwerk und dem Host-System korrekt hergestellt
sind.
3. Verify that you have correctly installed jumpers.
3. Stellen Sie sicher, daß die Kennungsbrücken installiert
sind.
4. Connect the 50-pin SCSI cable into the drive’s SCSI
connector (shown earlier in Figure 1). Take care not to
stretch or crimp this cable, and do not block the
system’s cooling air flow with the cable.
The drive receives DC power through a 4-pin connector mounted next to the SCSI connector. The output of
a power supply must meet SELV (safety extra low
voltage) as defined in IEC 950. Figure 4 provides the
pin information for the DC power connector. To connect the DC power cable to the drive, insert the cable
end into the drive’s DC power connector.
4. Schließen Sie das 50-polige SCSI-Kabel an den SCSI-
Steckverbinder des Laufwerkes an (wie bereits in
Abbildung 1 gezeigt). Das Kabel darf nicht gedehnt
oder gedrückt werden und es darf den Luftstrom zur
Kühlung des Systems nicht behindern.
Barracuda 2LP Installation Guide, Rev. E 29
Das Laufwerk wird über einen 4-poligen, neben dem
SCSI-Anschluß befestigten Steckverbinder mit
Gleichstrom versorgt. Der Ausgang eines Netzteils
muß SELV (safety extra low voltage) nach IEC 950
entsprechen. Abbildung 4 zeigt die Steckerbelegung
für den Gleichstromanschluß. Zum Anschluß des
Gleichstromkabels an das Laufwerk das Kabelende in
den Gleichstromanschluß des Laufwerkes stecken.
Pin
Pin
Power
1
+12V
2
+12V return
3
+ 5V return
4
+ 5V
4321
Figure 4. DC power connector
Abbildung 4. Gleichstromanschluß
Gleichstrom
1
+12 V
2
+12 V Rückleitung
3
+ 5 V Rückleitung
4
+ 5 V
30 Barracuda 2LP Installation Guide, Rev. E
Note. Signal ground on the power control board (PCB)
and the head and disc assembly (HDA) are connected together in this drive and you cannot separate them. The equipment in which you have
mounted the drive is connected directly to the HDA
and PCB without electrically isolating shock mounts.
Maximizing the conductive contact area between
HDA ground and system ground may reduce radiated emissions. If you do not want the system
chassis to be connected to the HDA/PCB ground,
you must provide a nonconductive (electrically
isolating) method of mounting the drive in the host
system. This may increase radiated emissions and
is the system designer’s responsibility.
Hinweis:
Die Signalerde auf der Stromregelungskarte (PCB)
und der Kopf- und Festplatteneinheit (HDA) sind in
diesem Laufwerk miteinander verbunden und
können nicht getrennt werden. Das Gerät, in das
Sie das Laufwerk eingebaut haben, ist ohne
elektrisch isolierende Stoßdämpfer direkt an die
HDA und PCB angeschlossen. Die
elektromagnetische Strahlung kann reduziert
werden, indem Sie eine möglichst große leitende
Kontakfläche zwischen der HDA-Erdung und der
Systemerdung vorsehen. Wenn Sie das
Barracuda 2LP Installation Guide, Rev. E 31
Systemgehäuse nicht an die HDA/PCB-Erdung
anschließen wollen, müssen Sie das Laufwerk auf
nichtleitende Weise (galvanisch isoliert) im HostSystem einbauen. Die daraus u.U. resultierende
verstärkte elektromagnetische Strahlung fällt in
den Zuständigkeitsbereich des Systemdesigners.
5. Replace the host system’s cover.
5. Setzen Sie das Gehäuseoberteil des Host-Systems
wieder auf.
Formatting the drive
Warning. Formatting a drive erases all user data. Be
sure that you understand this principle before
formatting any hard disc drive.
It is not necessary to format a drive which has
previously been used to store data, unless
your intention is to erase all user data.
1. Turn on DC power.
2. Boot the system from a system floppy disc or from a
previously installed hard disc drive if there is one.
3. Format the disc drive. Th e Barracuda 2LP disc drive
is de sig ne d to ope rate wi th a var iet y of op era ti ng
systems; therefore, please refer to your system or
SCSI controller manual for information about formatting and setting up the drive.
32 Barracuda 2LP Installation Guide, Rev. E
Enabling write cache
Write caching is a feature that allows the drive to transfer
write data to its own cache, tell the controller that the task
is complete, and then actually complete the write at a later
time. This improves write performance by freeing the
CPU to go on to its next command.
Warning. Information can be lost is you enable write
cache and there is a system failure (for example, power failure) before the data has
actually been physically written to the disc.
OEM drives are shipped with write cache disabled by
default. If you want to enable the write cache, refer to your
system’s drive controller and software utility documentation. Seagate provides an ASPI utility that you can use in
a PC compatible system to enable the write cache. It is
available on Seagate’s CompuServe forum and on the
Seagate BBS (refer to “Technical support services” on
page 9).
Barracuda 2LP Installation Guide, Rev. E 33
N/ND drives
Setting the SCSI ID jumpers
Use the J4 connector to set the SCSI ID (see Figure 5).
To change the SCSI ID, install jumpers on the appropriate
pins as shown in the illustration.
J4
(front view of J4)
Pin 1
J4
Pin 2
Pin 1
SCSI ID = 0 (default)
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
Figure 5. Setting the SCSI ID
34 Barracuda 2LP Installation Guide, Rev. E
N/ND drives
Terminating the drive
ST31250N and ST32550N drives are terminated with
permanently mounted IC active terminators. If you install
one of these drives and it is not on the end of the SCSI
bus, disable the terminators by removing the jumper from
pins 5 and 6 of connector J1 (see Figure 6). If you install
the drive on the end of the SCSI bus, enable termination
by installing a jumper on pins 5 and 6 of connector J1.
Note. Use active terminators when terminating the bus.
ST31250ND and ST32550ND drives do not have internal
terminators or any other way of adding internal termination to the drive. You must provide external active termination (ANSI SCSI-2 Alternative 2) to these drives when
termination is required.
J1
Pin 6
Enable SCSI
terminator (default)
Disable SCSI
terminator
Figure 6. Terminating the drive
Pin 1
Pin 1
Pin 6
J2
Pin 1
J1
Pin 2
Barracuda 2LP Installation Guide, Rev. E 35
Terminator power
N/ND drives
There are four possible terminator power configurations
for ST31250N and ST32550N drives (see Figure 7). You
will not normally need to change this option and can leave
the drive configured as it was shipped from the factory.
ST31250ND and ST32550ND drives should be configured with a jumper connecting J1 pins 1 and 3 (and no
jumper on J1 pins 2 and 4) as illustrated in Figure 7.
ST31250N and ST32550N
ST31250N and ST32550N
ST31250ND and ST32550ND
J1 Connector
Pin 6
Term. power from drive (default)
Term. power to SCSI bus
Term. power from SCSI bus
Term. power to SCSI bus
and drive
Term. power to SCSI bus (default)
Pin 1
ST31250ND and
ST32550ND
J1 Connector
Pin 1
Pin 2
J1
Pin 6
J1
Figure 7. Setting terminator power jumpers
Pin 1
Pin 2
Pin 1
Pin 2
36 Barracuda 2LP Installation Guide, Rev. E
N/ND drives
Synchronizing spindles
Use pins 5 and 6 on the J4 connector to attach the spindle
sync cable. See Figure 8.
Pin 1
J2
J4
(front view of J4)
Pin 1
J4
Pin 2
Pin 1
Spindle sync
cable connector
Figure 8. Spindle sync connectors
Spindle Sync Reference
Spindle Sync Ground
Barracuda 2LP Installation Guide, Rev. E 37
Other applicable jumper options
N/ND drives
Several other jumper options are available as illustrated.
J2
Pin 2
Pin 1
Reserved
Pin 1
(front view of J4)
Pin 1
J4
Pin 2
Pin 1
Reserved
Remote LED
connector*
Note to subsystem designers: In
*
Europe, a red LED indicates an error
or warning condition. For this reason,
you may want to use a color other
than red with this connection.
J2
GND (cathode)
POS (anode)
Parity Check option
Enable parity check of
SCSI bus (default).
Disable parity check.
Write Protect option
Write protect = Off
(enables writing –
default)
Write protect = On
J4
(disables writing)
Motor Start option
Enable motor start. The
drive waits for the Start
Unit command from the
host before starting the
spindle motor.
Disable motor start
(default). The drive
starts according to the
Delay Motor Start option.
Delay Motor Start
option (valid only if the
Motor Start jumper is
not connected)
Disable the Delay Motor
Start option (default).
Motor start delay equal
to the SCSI ID multiplied
by 10 seconds. For
example, if the SCSI
ID = 2, the drive starts
in 20 seconds.
Figure 9. Additional jumper options
38 Barracuda 2LP Installation Guide, Rev. E
W/WD drives
Setting the SCSI ID jumpers
Use the J5 connector to set the SCSI ID (Figure 10). To
change the SCSI ID, install jumpers on the appropriate
pins as shown in the illustration.
SCSI I/O
Connector
SCSI ID = 0 (default)
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
J5
Pin 1
Pin 1
J5
ID3
ID1
ID2
ID0
DC Power
Connector
4P 3P 2P 1P
Figure 10. Setting the SCSI ID
Barracuda 2LP Installation Guide, Rev. E 39
Terminating the drive
W/WD drives
ST31250W and ST32550W drives are terminated with
permanently mounted IC active terminators. If you install
one of these drives and it is not on the end of the SCSI
bus, disable the terminators by removing the jumper from
pins 5 and 6 of connector J1. If you install the drive on the
end of the SCSI bus, enable termination by installing a
jumper on pins 5 and 6 of connector J1 (see Figure 11).
Note. Use active terminators when terminating the bus.
ST31250WD and ST32550WD drives do not have inter-
nal terminators or any other way of adding internal
termination to the drive. You must provide external active
termination (ANSI SCSI-2 Alternative 2) to these drives
when termination is required.
J1
Enable SCSI
terminator (default)
Disable SCSI
terminator
Pin 1
Pin 1
J2
Pin 1
J1
Pin 2
Figure 11. Terminating the drive (ST32550W shown)
40 Barracuda 2LP Installation Guide, Rev. E
W/WD drives
Terminator power
There are four possible terminator power configurations
for ST31250W and ST32550W drives (see Figure 12).
You will not normally need to change this option and can
leave the drive configured as it was shipped from the
factory.
ST31250WD and ST32550WD drives should be configured with a jumper connecting J1 pins 1 and 3 (and no
jumper on J1 pins 2 and 4) as illustrated in Figure 12.
ST31250W and ST32550W
J1 Connector
Pin 6
ST31250W and ST32550W
Term. power from drive (default)
Term. power to SCSI bus
Term. power from SCSI bus
Term. power to SCSI bus
and drive
ST31250WD and ST32550WD
Term. power to SCSI bus (default)
Pin 1
Pin 2
Pin 1
ST31250WD and
ST32550WD
J1 Connector
Pin 3
Pin 4
J1
Pin 2
Pin 1
Pin 1
Pin 2Pin 6
J1
Pin 4
Pin 3
Figure 12. Setting terminator power jumpers
Barracuda 2LP Installation Guide, Rev. E 41
Synchronizing spindles
W/WD drives
Use pins 11 and 12 on the J5 connector to attach the
spindle sync cable. See Figure 13.
SCSI I/O
Connector
J5
Spindle sync
cable connector
Pin 1
SS
Pin 1
J5
DC Power
Connector
4P 3P 2P 1P
Spindle Sync Reference
Spindle Sync Ground
Figure 13. Spindle sync connectors
42 Barracuda 2LP Installation Guide, Rev. E
W/WD drives
Other applicable jumper options
Other option jumpers are available as illustrated below.
Pin 1
J2
J2
Pin 2
Pin 1
Reserved
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
Write Protect option
Write protect = Off (enables writing – default)
Write protect = On (disables writing)
Motor Start option
Enable motor start. The drive waits for the Start
Unit command from the host before starting the
spindle motor.
Disable motor start (default). The drive starts
according to the Delay Motor Start option.
Delay Motor Start option (valid only if
the Motor Start jumper is not connected)
Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied
by 10 seconds. For example, if the SCSI ID = 2,
the drive starts in 20 seconds.
Figure 14a. Additional jumper options
Barracuda 2LP Installation Guide, Rev. E 43
W/WD drives
Pin 1
J2
SCSI I/O
Connector
Remote unit active
LED connector
Pin 1
Pin 1
J5
GND (cathode)
POS (anode)
SCSI ID = 0
Fault LED pin (+)
SCSI ID = 1
Vendor Unique
SCSI ID = 2
SSREF (+)
SCSI ID = 3
Unit Active LED pin (+)
Enable termination
Ground
+5 volts
Not connected
Reserved
Pin 2
Pin 1
J4
(front view of J4)
Pin 1
J4
Figure 14b. Additional jumper options
44 Barracuda 2LP Installation Guide, Rev. E
WC/DC drives
Setting the SCSI ID jumpers
The SCSI ID for WC drives is normally set over the SCSI
bus by the host system using connector contacts 39
(ID0), 40 (ID2), 79 (ID1), and 80 (ID3). Systems designers may, optionally, install a remote operator panel connection to set the SCSI ID. Figure 15b illustrates the SCSI
ID pins used for this purpose.
Terminating the drive
ST31250WC and ST32550WC drives do not have internal terminators or any other way of adding internal
termination to the drive. You must provide single-ended
external active termination (ANSI SCSI-2 Alternative 2)
to these drives when termination is required.
Synchronizing spindles
Spindle synchronization for WC drives is normally handled
on the SCSI bus by the host system using connector
contact 37 for the spindle sync reference signal. System
designers may, optionally, install a spindle sync cable
using pin 6 on the J4 connector to provide +SSREF (see
Figure 15b).
Barracuda 2LP Installation Guide, Rev. E 45
WC/DC drives
Applicable jumper options
Option jumpers are available as illustrated below.
Pin 1
J2
J2
Pin 2
Pin 1
Reserved
Parity Check option
Enable parity check of SCSI bus (default).
Disable parity check.
Write Protect option
Write protect = Off (enables writing – default)
Write protect = On (disables writing)
Motor Start option
Enable motor start. The drive waits for the Start
Unit command from the host before starting the
spindle motor.
Disable motor start (default). The drive starts
according to the Delay Motor Start option.
Delay Motor Start option (valid only if
the Motor Start jumper is not connected)
Disable the Delay Motor Start option (default).
Motor start delay equal to the SCSI ID multiplied
by 10 seconds. For example, if the SCSI ID = 2,
the drive starts in 20 seconds.
Figure 15a. Jumper options
46 Barracuda 2LP Installation Guide, Rev. E
WC/DC drives
Pin 1
J2
J4
(front view of J4)
Pin 1
J4
Pin 2
Pin 1
SCSI ID = 0
Fault LED pin (–)
SCSI ID = 1
Vendor Unique
SCSI ID = 2
SSREF (+)
SCSI ID = 3
Unit Active LED pin (–)
Not used
Ground
+5 volts
Not connected
Reserved
Figure 15b. Additional jumper options
Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 83328920, Rev. E, Printed in USA
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