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BARRACUDA 1 and 2
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Disc Drive
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
ST11950N/ND/W/WD
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
ST12550N/ND/W/WD
○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
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 ................................................ 12
Initial setup information........................................... 19
Kühlung des Systems .......................................... 36
Installation des Laufwerkes
und Anschluß der Kabel....................................... 39
© 1994 Seagate Technology, Inc. All rights reserved
Publication Number: 83327770, Rev. D
June 1994
Seagate®, Seagate Technology®, and the Seagate logo
are registered trademarks of Seagate Technology, Inc.
Barracuda™, SeaFAX™, SeaFONE™, SeaTDD™, and
SeaBOARD™ are trademarks of Seagate Technology,
Inc. Other product names are registered trademarks or
trademarks of their owners.
No part of this publication may be reproduced in any
form without written permission from Seagate Technology, Inc.
Page 3
ST11950 and ST12550 Installation Guide, Rev. D 1
Preface
This manual contains information for users of the
Seagate® ST11950N/ND, ST11950W/WD, ST12550N/ND,
and ST12550W/WD Barracuda™ SCSI disc drives. It
provides support services, performance specifications,
and initial setup information. Additional information is
available in the
number 83327780). Contact your Seagate sales representative if you need to order this publication.
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 well as some resistors and capacitors, may be damaged or degraded by
exposure to static electricity.
Electrostatic damage to electronic devices may be
caused by the direct discharge of a charged conductor
or by exposure to the static fields surrounding charged
objects. To avoid damaging drive electronic assemblies,
observe the following precautions when installing or
servicing the drive:
Barracuda 1 and 2 Product Manual
performing depot repair will damage components and may void the warranty.
(part
Page 4
2 ST11950 and ST12550 Installation Guide, Rev. D
• 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.
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.
The procedures in this manual and labels on the unit
contain warnings and cautions that must be carefully
Page 5
ST11950 and ST12550 Installation Guide, Rev. D 3
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.
Page 6
4 ST11950 and ST12550 Installation Guide, Rev. D
• 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 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 chassis. Return the entire drive for depot repair if any circuit
board is defective. Removal of circuit boards by personnel not performing depot repair will damage components and may void the warranty.
• Do not remove the head and disc assembly (HDA) from
the drive 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 components 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 stan-
Page 7
ST11950 and ST12550 Installation Guide, Rev. D 5
dards. Typical applications of these disc drives include
customer packaging and subsystem design. Safety
agencies conditionally certify component parts, 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 assembly 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
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6 ST11950 and ST12550 Installation Guide, Rev. D
dürfen nur von qualifiziertem Fachpersonal
vorgenommen 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
Page 9
ST11950 and ST12550 Installation Guide, Rev. D 7
zuerst sicher, daß das gewählte Verfahren weder Ihre
persönliche Sicherheit noch die Leistung der Einheit
gefährdet.
Beachten Sie in jedem Fall die folgenden Warn-und
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.
Page 10
8 ST11950 and ST12550 Installation Guide, Rev. D
• 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 Installation 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
Page 11
ST11950 and ST12550 Installation Guide, Rev. D 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.
Page 12
10 ST11950 and ST12550 Installation Guide, Rev. D
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.
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 that is
connected to the phone line. A TDD device is required to
Page 13
ST11950 and ST12550 Installation Guide, Rev. D 11
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 accessible by modem 24 hours a day, 7 days
a week. The communications software must be set for
eight data bits, no parity, and one stop bit (8N1). These
BBS numbers operate at 9600 baud max. With this
service you can access:
• Specifications and jumper configurations for Seagate
products
• Reprints of Seagate documentation
• A directory of information and helpful utilities that you
can download to your own computer
Telephone
Location 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
Page 14
12 ST11950 and ST12550 Installation Guide, Rev. D
General description
Barracuda 1 and 2 SCSI disc drives are high-speed,
random-access digital-data storage devices. The
ST11950N/ND and ST12550N/ND drives are illustrated
in Figure 1, and the ST11950W/WD and ST12550W/WD
drives are illustrated in Figure 2. Specifications and DC
power requirements for the drive are listed in tables
following the figure.
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
Barracuda 1 and 2 Product Manual
83327780) contains guidelines for a properly designed
enclosure.
(part number
Page 15
ST11950 and ST12550 Installation Guide, Rev. D 13
I/O Terminator Packs
(single-ended I/O only)
SCSI I/O
Connector
DC Power Connector
J4
J01
SCSI I/O
Connector
DC Power
Connector
J4
J01
Pin 1
J5
Figure 1. Barracuda 1 and 2 disc drive (N/ND type)
Figure 2. Barracuda 1 and 2 disc drive (W/WD type)
Page 16
14 ST11950 and ST12550 Installation Guide, Rev. D
Characteristics ST11950N/ND ST11950W/WD
Interface Fast SCSI-2
Multi-seg. cache 1,024 Kbytes 1,024 Kbytes (W)
Capacity
Unformatted 2,030 Mbytes 2,030 Mbytes
Formatted
2
1,690 Mbytes 1,690 Mbytes
Recording
Cylinders (user) 2,706 2,706
Heads 15 15
Avg sectors/track 81 (51h) 81 (51h)
Avg bytes/track 49,768 49,768
Modulation RLL 1,7 code RLL 1,7 code
SCSI rate
Max burst transfer 10 Mbytes/sec 20 Mbytes/sec
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
1
Can also be operated according to SCSI-1 protocol.
2
Standard factory units are formatted as follows:
512 data bytes per sector, 6 spare sectors per cylinder
1 cylinder at the inner track reserved for spares
3
Not including on-board controller overhead.
1
Fast & Wide SCSI-2
512 Kbytes (WD)
1
Page 17
ST11950 and ST12550 Installation Guide, Rev. D 15
Characteristics ST12550N/ND ST12550W/WD
Interface Fast SCSI-2
Multi-seg. cache 1,024 Kbytes 1,024 Kbytes (W)
Capacity
Unformatted 2,572 Mbytes 2,572 Mbytes
Formatted
2
2,139 Mbytes 2,139 Mbytes
Recording
Cylinders (user) 2,707 2,707
Heads 19 19
Avg sectors/track 81 (51h) 81 (51h)
Avg bytes/track 49,768 49,768
Modulation RLL 1,7 code RLL 1,7 code
SCSI rate
Max burst transfer 10 Mbytes/sec 20 Mbytes/sec
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
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
1 cylinder at the inner track reserved for spares
3
Not including on-board controller overhead.
1
Fast & Wide SCSI-2
512 Kbytes (WD)
1
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16 ST11950 and ST12550 Installation Guide, Rev. D
DC power requirements
for ST11950N/ND and ST12550N/ND drives
Single-ended Differential
++
+5V
Voltage regulation
5
++
±±
± 5%
±±
Maximum operating current11.1 0.95 1.5 0.95
Average idle current
Maximum starting current
Peak DC
Peak AC
Delayed motor start (max)
Peak operating current
Typ DC
1, 10
Max DC
1, 12
3, 6
3
1
0.76 0.83 0.79 0.83
1.0 2.18 1.1 2.18
− 3.1 − 3.1
1, 4
1.06 0.19 1.1 0.2
1.07 0.91 1.47 0.91
1.1 0.95 1.5 0.95
Max (peak) 1.15 1.87 1.8 1.86
Track following (DC)
Read track
at OD
1
at ID
OD DC
1
1, 14
1.0 0.84 1.1 0.84
1.0 0.9 1.1 0.9
1.1 0.85 1.6 0.85
AC 1.2 1.2 1.8 1.2
Seeking
Typical DC
Maximum DC
1, 13
1
1.0 1.2 1.1 1.2
1.1 1.2 1.2 1.2
Maximum (peak) AC 1.2 1.8 1.7 1.8
++
+12V
++
±±
± 5%
±±
Amps
++
+5V
++
2
±±
± 5%
±±
++
+12V
++
±±
± 5%
±±
2
Page 19
ST11950 and ST12550 Installation Guide, Rev. D 17
DC power requirements
for ST11950W/WD and ST12550W/WD drives
Single-ended Differential
++
+5V
Voltage regulation
5
++
±±
± 5%
±±
Maximum operating current11.04 0.95 1.3 0.95
1
3, 6
3
1, 12
0.76 0.83 0.83 0.83
1.0 2.18 1.1 2.18
− 3.1 − 3.1
1, 4
1.0 0.19 1.1 0.19
1.03 0.91 1.21 0.91
1.04 0.95 1.3 0.95
Average idle current
Maximum starting current
Peak DC
Peak AC
Delayed motor start (max)
Peak operating current
Typ DC
1, 10
Max DC
Max (peak) 1.2 1.87 2.0 1.87
Track following (DC)
Read track
at OD
1
at ID
OD DC
1
1, 15
1.0 0.84 1.1 0.84
1.0 0.9 1.1 0.9
1.1 0.85 1.4 0.85
AC 1.3 1.2 2.0 1.2
Seeking
Typical DC
Maximum DC
1, 13
1
1.0 1.2 1.1 1.2
1.1 1.2 1.2 1.2
Maximum (peak) AC 1.2 1.8 2.0 1.8
1
Measured with an average reading DC ammeter. Instantaneous +12V current peaks will exceed these values.
continued
++
+12V
++
±±
± 5%
±±
Amps
++
+5V
++
2
±±
± 5%
±±
++
+12V
++
±±
± 5%
±±
2
Page 20
18 ST11950 and ST12550 Installation Guide, Rev. D
continued from previous page
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
4
This condition occurs when the Motor Start option is enabled and the drive has not yet received a start motor
command.
5
See “Conducted noise immunity” in the
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 2.0A, 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 7% 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 0.07 seconds.
continued
Product Manual
Product Manual.
.
Page 21
ST11950 and ST12550 Installation Guide, Rev. D 19
continued from previous page
11
No terminator power. See Section 11.7.3.4 in the
uct Manual.
12
All power-saving features are enabled.
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
91% duty cycle.
15
Read track is defined as repeat reads of track 15 with a
75% duty cycle.
Prod-
Initial setup information
The following topics are presented to guide you through
the installation process. These topics are presented in
the order you should follow to properly install the drive.
• Setting the SCSI ID jumpers
• Terminating the drive
• Changing other applicable jumper options
• Synchronizing spindles
• Providing adequate cooling
• Mounting the drive and connecting cables
• Formatting the drive
Each option jumper illustration identifies the Original
Equipment Manufacturer (OEM) default factory setting.
These settings are the most common ones used but are
not necessarily the ones set for your particular system.
Page 22
20 ST11950 and ST12550 Installation Guide, Rev. D
Setting the 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 (ID7 in non-wide systems); 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.
Use connector J4 to set the SCSI ID on ST11950N/ND
and ST12550N/ND drives (Figure 3). Use connector J5
to set the SCSI ID on ST11950W/WD and ST12550W/WD
drives (Figure 4). Most Barracuda 1 and 2 disc drives are
factory set with the SCSI ID set at 0. To change the SCSI
ID, install jumpers on the appropriate pins as shown in
the illustrations.
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.
Page 23
ST11950 and ST12550 Installation Guide, Rev. D 21
SCSI ID = 0
SCSI ID = 7
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
J4
ID2
ID1
ID0
Select SCSI ID by placing
jumpers as shown below.
SCSI
Connector
DC Power
Connector
J01
J4
Pin 1
Also check your system or controller user’s manual to
ensure that you have not violated its SCSI ID numbering
recommendations.
Figure 3. Setting the SCSI ID on N- and ND-type drives
Page 24
22 ST11950 and ST12550 Installation Guide, Rev. D
DC Power
Connector
SCSI I/O
Connector
SCSI ID = 8
SCSI ID = 9
SCSI ID = 10
SCSI ID = 11
SCSI ID = 12
SCSI ID = 13
SCSI ID = 14
SCSI ID = 15
SCSI ID = 0
SCSI ID = 1
SCSI ID = 2
SCSI ID = 3
SCSI ID = 4
SCSI ID = 5
SCSI ID = 6
SCSI ID = 7
J5
4P 3P 2P 1P
Pin 1
Pin 1
ID3
ID2
ID1
ID0
J5
Figure 4. Setting the SCSI ID on W- and WD-type drives
Page 25
ST11950 and ST12550 Installation Guide, Rev. D 23
Internal
SCSI device
Internal
SCSI device
Controller
External
SCSI device
External
SCSI device
External
SCSI
cable
Internal SCSI cable
Terminate
Internal
SCSI device
Internal
SCSI device
Controller
Internal SCSI cable
Terminate
Terminating the drive
If you are installing the 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 5 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.
Figure 5. SCSI bus termination
Page 26
24 ST11950 and ST12550 Installation Guide, Rev. D
I/O Terminator Packs
(single-ended I/O only)
Pin 1 End
(of terminator)
Refer to the appropriate section below for instructions in
terminating a drive.
Caution. Installing or removing terminator packs im-
properly can result in damage to the terminators or surrounding components.
ST11950N and ST12550N drives
To terminate ST11950N and ST12550N drives, install
terminator packs as shown in Figure 6.
Figure 6. Installing terminator packs (ST11950N shown)
Page 27
ST11950 and ST12550 Installation Guide, Rev. D 25
Note.All single-ended terminators must be ANSI
SCSI-2 alternative 2 active terminators.
To install terminators, carefully insert the terminator’s
pins firmly into the socket’s holes. Note that pin 1 on the
pack is identified by a dot, a number one, or a notch.
To remove termination, remove the terminator packs by
carefully pulling them out of their sockets.
ST11950W and ST12550W drives
ST11950W and ST12550W drives are equipped with
permanently mounted IC terminators. This means you
can either enable or disable termination using jumpers
as described below.
To terminate ST11950W and ST12550W drives (enable
termination), install a jumper on J4 pins 11 and 12 as
shown in Figure 7.
To remove termination (disable termination), remove
the jumper from J4 pins and 11 and 12.
Page 28
26 ST11950 and ST12550 Installation Guide, Rev. D
Enable drive terminators.
J4
EDT
RES
PAR
Enable Drive Terminators (EDT)
Disable drive terminators.
J01
Pin 1
J4
MTR
DMS
WPRES
Figure 7. Enabling termination
on ST11950W and ST12550W drives
ST11950ND/WD and ST12550ND/WD drives
ST11950ND/WD and ST12550ND/WD drives have no
provisions for internal termination. To terminate these
drives, you must provide external termination.
Page 29
ST11950 and ST12550 Installation Guide, Rev. D 27
* Terminator power from the drive. The
drive provides its own terminator power.
* Terminator power from TERMPWR on the
SCSI bus.
Terminator power to the SCSI bus. The drive
supplies power to TERMPWR on the SCSI bus.
* Terminator power to the SCSI bus and drive.
J01
Terminator power options.
These jumpers determine how
termination is supplied.
J4
Pin 1
J01
J4
Pin 1
J01 location on “N”
and “ND” drives
J01 location on “W”
and “WD” drives
Pin 3
Pin
4
Pin
2
* Valid for single-ended (“N” and “W”) drives only.
Terminator power
Single-ended (N and W) drives have four valid configurations for terminator power (see Figure 8). Differential
(ND and WD drives) must be configured with a jumper
on J01 pins 1 and 3 only.
Figure 8. Setting terminator power jumpers
Page 30
28 ST11950 and ST12550 Installation Guide, Rev. D
Write Protect = On (disables writing).
Write Protect = Off
(enables writing – default).
J4
RES
WP
LED
Write Protect option (WP)
Reserved for factory use.
Reserved (RES)
SCSI
Connector
DC Power
Connector
J01
J4
Pin 1
Pin 5 (top pin in this illustration) is negative,
Pin 6 (bottom pin) is positive.*
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.
RES
Changing other applicable jumper options
Barracuda 1 and 2 drives are designed to be used in a
variety of systems. Unique installations may require you
to change one or more of the other jumpers to meet
specific system requirements; however, in most cases,
you will not need to change any of these jumpers for
normal drive operation. Figures 9a and 9b provide the
information necessary to configure all N and ND drive
jumpers not discussed elsewhere in this manual.
Figure 9a. Additional jumper options
for ST11950N/ND and ST12550N/ND drives
Page 31
Enable parity check of SCSI bus data
(default).
J4
PAR
MTR
DMS
Parity Check option (PAR)
Disable parity check.
Enable motor start. This makes the
drive wait for the Start Unit command
from the host before starting the
spindle motor.
Motor Start option (MTR)
Disable motor start (default). This
causes the drive to start according to
the Delay Motor Start option setting as
described below.
Motor start delay equal to the SCSI ID
multiplied by 10 seconds. For example,
if the SCSI ID = 2, the drive will delay for
20 seconds before starting.
Delay Motor Start option (DMS)
(valid only if the Motor Start
jumper is not connected)
Disable the Delay Motor Start option
(default).
SCSI
Connector
DC Power
Connector
J01
J4
Pin 1
ST11950 and ST12550 Installation Guide, Rev. D 29
Figure 9b. Additional jumper options
for ST11950N/ND and ST12550N/ND drives
Page 32
30 ST11950 and ST12550 Installation Guide, Rev. D
DC Power
Connector
SCSI I/O
Connector
Pin 9 (top pin in this illustration) is
negative (cathode), Pin 10 (bottom pin)
is positive (anode).
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.
J5 Pin 1
LED
J5
Figures 10a and 10b provide the information necessary
to configure all W and WD drive jumpers not discussed
elsewhere in this manual.
Figure 10a. Additional jumper options
for ST11950W/WD and ST12550W/WD drives
Page 33
ST11950 and ST12550 Installation Guide, Rev. D 31
J4
RES
RES
PAR
Reserved for factory use.
Reserved (RES)
Enable motor start. This makes the drive wait
for the Start Unit command from the host before
starting the spindle motor.
Motor Start option (MTR)
Disable motor start (default). This causes the
drive to start according to the Delay Motor
Start option setting as described below.
J01
Pin 1
J4
MTR
DMS
WP
Enable parity check of SCSI bus data (default).
Parity Check option (PAR)
Disable parity check of SCSI bus data.
Motor start delay equal to the SCSI ID multiplied
by 10 seconds. For example, if the SCSI ID = 2,
the drive will delay for 20 seconds before starting.
Delay Motor Start option (DMS)
(valid only if the Motor Start option
jumper is not connected)
Disable the Delay Motor Start option (default).
Write Protect = On (disables writing).
Write Protect option (WP)
Write Protect = Off (enables writing – default).
Figure 10b.Additional jumper options
for ST11950W/WD and ST12550W/WD drives
Page 34
Spindle sync reference index signal
(REFSIG+).
J4
SSC
Spindle Sync Cable Connector
(SSC). These pins are used to
connect a spindle sync cable.
Ground (GND).
SCSI
Connector
DC Power
Connector
J01
J4
Pin 1
Pin 2
32 ST11950 and ST12550 Installation Guide, Rev. D
Synchronizing spindles
If you are installing two or more Barracuda drives, you
may (optionally) want to synchronize their spindles to
reduce the latency associated with switching from one
drive to another. Spindle sync cables are used to connect the drives.
For N- and ND-type drives, use pins 1 and 2 on the J4
connector to attach the spindle sync cable. Pin 1
provides the reference index signal (REFSIG+) and
pin 2 provides ground (GND). See Figure 11.
Figure 11. Spindle sync jumpers and connectors
for ST11950N/ND and ST12550N/ND drives
Page 35
ST11950 and ST12550 Installation Guide, Rev. D 33
DC Power
Connector
SCSI I/O
Connector
Spindle sync reference index signal
(REFSIG+).
Spindle Sync Cable Connector (SSC)
These pins are used to connect a
spindle sync cable.
Ground (GND).
J5 Pin 1
SSC
J5
For W- and WD-type drives, use pins 11 and 12 on the
J5 connector to attach the spindle sync cable. Pin 11
provides the reference index signal (REFSIG+) and pin
12 provides ground (GND). See Figure 12.
Figure 12. Spindle sync jumpers and connectors
for ST11950W/WD and ST12550W/WD drives
Page 36
34 ST11950 and ST12550 Installation Guide, Rev. D
Master Sync
Source
Host
(or other drive)
Spindle
Control
Drive 1
+5V
R
T
J4
1
2
Spindle
Control
Drive 2
+5V
R
T
J4
1
2
Spindle
Control
Drive n
+5V
R
T
J4
1
2
Sync Interface
System
Interface
Master Sync
Source
Host
(or other drive)
Spindle
Control
Drive 1
+5V
R
T
J5
11
12
Spindle
Control
Drive 2
+5V
R
T
J5
11
12
Spindle
Control
Drive n
+5V
R
T
J5
11
12
Sync Interface
System
Interface
ST11950N/ND and
ST12550N/ND Drives
ST11950W/WD and
ST12550W/WD Drives
Figure 13 illustrates a typical synchronized spindle
configuration.
After connecting each drive with spindle sync cables,
you must 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.
Figure 13. Spindle sync diagram
Page 37
ST11950 and ST12550 Installation Guide, Rev. D 35
Providing adequate cooling
The enclosure design must ensure adequate cooling
for the drive. The m aximum a mbient temperature is
50oC.
The drive’s product manual (83327780) describes how
to evaluate the air-flow design. The evaluation consists
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 is heated by the drive and by other nearby heat
sources.
Figure 14 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.
Page 38
36 ST11950 and ST12550 Installation Guide, Rev. D
Kühlung des Systems
Die Gehäusekonstruktion muß eine ausreichende
Kühlung des Laufwerkes gewährleisten. Die
Umgebungstemperatur darf maximal 50oC betragen.
Die Produkthandbuch Barracuda 1 und 2 (Dokument
83327780) 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 14 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.
Page 39
ST11950 and ST12550 Installation Guide, Rev. D 37
Above unit
Über der Einheit
Under unit
Unter der Einheit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Note. Air flows in the direction shown or
in reverse direction (side to side)
Above unit
Über der Einheit
Under unit
Unter der Einheit
Hinweis. Luftstrom in der angezeigten Richtung
(von vorne nach hinten) oder in umgekehrter
Richtung (von hinten nach vorne)
Hinweis. Luftstrom in der angezeigten Richtung oder in
umgekehrter Richtung (von Seite zu Seite)
Figure 14. Suggested air flow
Abbildung 14. Empfohlener Luftstromverlauf
Page 40
38 ST11950 and ST12550 Installation Guide, Rev. D
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. See Figure 15.
The maximum length that the screws should extend into the chassis mounting holes is 0.15 inch
(3.81 mm), measured 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.
Page 41
ST11950 and ST12550 Installation Guide, Rev. D 39
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-UNCSchrauben 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. Siehe Abbildung 15.
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.
Page 42
40 ST11950 and ST12550 Installation Guide, Rev. D
T
U
R
F
(1)
ED
K
L
A
M
(3)
N
C
P
B
S
H
G
J
Notes:
(1)
(2)
(3)
(4)
Inches Millimeters
5.740
4.000
1.615
.615
4.000
.250
1.750
3.750
2.370
5.420
5.565
5.930
.240
.410
1.725
4.100
.190
0.015
145.80
101.60
41.02
15.68
101.60
6.35
44.45
95.25
60.20
137.69
141.35
150.62
6.10
10.31
43.82
104.14
4.83
0.381
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
S
T
U
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
max
0.010
0.010
0.011
0.020
0.005
0.005
0.010
0.010
0.010
0.020
0.010
0.020
0.015
0.015
0.010
0.010
0.010
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
±
max
.25
.25
.28
.50
.13
.13
.25
.25
.25
.50
.25
.50
.38
.38
.25
.25
.25
Mounting holes two on each
side, 6-32 UNC. Max screw
length into side of drive is
0.15 in. (3.81 mm).
Mounting holes four on
bottom, 6-32 UNC. Max
screw length into bottom of
drive is 0.15 in. (3.81 mm).
Power and interface
connections.
Decorative front panel.
(4)
(2)
Figure 15. Dimensions
Abbildung 15. Laufwerkabmessungen
Page 43
ST11950 and ST12550 Installation Guide, Rev. D 41
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 SCSI ID jumpers (see Figures 3, 4, 6, and 7).
3. Stellen Sie sicher, daß die Kennungsbrücken installiert
sind. Siehe Abbildung 3, 4, 6, und 7.
4. Connect the 50-pin SCSI cable into the drive’s SCSI
connector (shown earlier in Figures 3 and 4). 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 16 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 3 und Abbildung 4 gezeigt). Das Kabel
Page 44
42 ST11950 and ST12550 Installation Guide, Rev. D
4 3 2 1
Pin
1
2
3
4
Gleichstrom
+12 V
+12 V Rückleitung
+ 5 V Rückleitung
+ 5 V
darf nicht gedehnt oder gedrückt werden und es darf
den Luftstrom zur Kühlung des Systems nicht
behindern.
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 16 zeigt die Steckerbelegung
für den Gleichstromanschluß. Zum Anschluß des
Gleichstromkabels an das Laufwerk das Kabelende
in den Gleichstromanschluß des Laufwerkes stecken.
Pin
Power
1
+12V
2
+12V return
3
+ 5V return
4
+ 5V
Figure 16. DC power connector
Abbildung 16. Gleichstromanschluß
Page 45
ST11950 and ST12550 Installation Guide, Rev. D 43
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
Page 46
44 ST11950 and ST12550 Installation Guide, Rev. D
Systemgehäuse nicht an die HDA/PCB-Erdung
anschließen wollen, müssen Sie das Laufwerk
auf nichtleitende Weise (galvanisch isoliert) im
Host-System 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.
Page 47
ST11950 and ST12550 Installation Guide, Rev. D 45
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. The Barracuda 1 and 2 disc
drives are designed to operate with a variety of
operating systems; therefore, please refer to your
system or SCSI controller manuals for information
about formatting and setting up the drives.
Page 48
Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 83327770, Rev. D, Printed in USA
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