BARRACUDA2, 2HP
Disc Drive
ST12450W/WD
Installation Guide
ST12450W/WD Installation Guide, Rev. B
1
Preface
This manual contains information for users of the
Seagate® ST12450W/WD Barracuda™ SCSI disc
drives. Itprovidessupportservices,performancespeci-
fications, and initial setup information. Additional infor-
mation is available in the Barracuda 2, 2HP Product
Manual (partnumber83328900).ContactyourSeagate
salesrepresentativeifyouneedtoorderthispublication.
Electrostatic discharge protection
Caution. Removal of circuit boards by personnel not
performing depot repair will damage com-
ponents and may void the warranty.
All drive electronic assemblies are sensitive to static
electricity, due to the electrostatically sensitive devices
used within the drive circuitry. Although some devices
suchasmetal-oxidesemiconductorsareextremelysen-
sitive, allsemiconductors, aswellassomeresistorsand
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.Toavoiddamagingdriveelectronicassemblies,
observe the following precautions when installing or
servicing the drive:
2
ST12450W/WD Installation Guide, Rev. B
• 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).Connectionmaybemadetoanygrounded
metal assembly. As a general rule, remember that you
andthedriveelectronicsmustallbegroundedtoavoid
potentially damaging static discharges.
• TurnoffthepowerbeforeremovingorinstallingtheDC
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. Useforced-airventilationwhenbench-testing
the drive to ensure proper cooling of drive
components.
Usepropersafetyandrepairtechniquesforsafe,reliable
operation of this unit. Service should be done only by
qualifiedpersons.Werecommendtheproceduresinthis
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
ST12450W/WD Installation Guide, Rev. B
3
read and followed to minimize or eliminate the risk of
personal injury. The warnings point out conditions or
practicesthatmayendangeryouorothers.Thecautions
point out conditions or practices that may damage the
unit, possibly making it unsafe for use.
These warnings and cautions are not exhaustive. We
cannotpossiblyknow,evaluate,andadviseyouofallthe
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.
Alwaysobservethefollowingwarningsandprecautions:
• Performallmaintenancebyfollowingtheproceduresin
this manual.
• Follow all cautions and warnings in the procedures.
• Use sound safety practices when operating or repair-
ing 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
ST12450W/WD Installation Guide, Rev. B
• 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 per-
sonnel not performing depot repair will damage com-
ponents and may void the warranty.
• Donotremovetheheadanddiscassembly(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 stan-
ST12450W/WD Installation Guide, Rev. B
5
dards. Typical applications of these disc drives include
customer packaging and subsystem design. Safety
agencies conditionally certify component assemblies,
such asthe 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
compliancein 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
resultsareavailablethroughtheSeagateSafetyDepart-
ment 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
6
ST12450W/WD Installation Guide, Rev. B
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.
DieWarnhinweisemachenaufSituationenoderPraktiken
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
WartungsmethodenoderdieeventuellenRisikenjeder
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
ST12450W/WD Installation Guide, Rev. B
7
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
Reparaturarbeitenbeginnen.
• 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
betestigtwerden,achtenSiebesondersaufdenoberen
Stapelbereich, da dort die Temperatur gewöhnlich am
höchsten ist.
8
ST12450W/WD Installation Guide, Rev. B
• Befolgen Sie die oben unter “Electrostatic Discharge
Protection” angegebenen Sicherheitsmaßnahmen.
• NehmenSiekeinePlatinenausdemLaufwerkgehäuse.
Wenn eine Platine defekt ist, muß das gesamte
Laufwerk zur Reparatur eingeschickt werden. Die
HerausnahmevonPlatinendurchanderePersonenals
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
ST12450W/WD Installation Guide, Rev. B
9
geltendenStandardszugewährleisten.Zudentypischen
Anwendungen dieser Festplattenwerke zählen
Systemeinbau durch den Kunden und die Konstruktion
vonUntersystemen.Sicherheitsbehördengewähreneine
bedingte Zulassung für Komponenten wie das Barra-
cuda-Festplattenlaufwerkvorbehaltlichderendgültigen
ZulasssungimEndprodukt.DesignervonUntersystemen
sind dafür verantwortlich, die Voraussetzungen für die
Einhaltung sicherheits- oder aufsichtsbehördlicher
VorschrifteninihrenEndproduktenund-fallsgesetzlich
vorgeschrieben - für die Zulassung zu schaffen.
Eine Grundvoraussetzung zur Einhaltung der
Sicherheitsanforderungen ist die Bereitstellung
eines Überlastschutzes für die SELV-
Versorgungsspannungen des Laufwerks.
Dieses Gerät ist eine Baugruppe und unterliegt als
solchenichtdenAnforderungenderFCCoderähnlicher
nationaler Behörden für eigenständige Geräte.
Technische Testergebnisse zu elektromagnetische
Strahlung sind für Designer von Untersystemen auf
Anfrage von der Seagate-Sicherheitsabteilung
erhältlich.
10
ST12450W/WD Installation Guide, Rev. B
Technical support services
Seagate Technology provides technical support litera-
ture and diagnostic utilities to authorized distributors.
Please contact your dealer for technical support and
installation troubleshooting. Producttechnicalsupport
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
Youcanuseatouch-tonetelephonetoaccessSeagate’s
automated FAX delivery system and select technical
support information by return FAX. This service is avail-
able 24 hours a day, 7 days a week.
CompuServe Forum
Online support for Seagate products is available on
CompuServe.Type"GoSeagate"toaccesstheSeagate
forum. This service is available 24 hours a day, 7 days
a week.
SeaFONE: (408) 438-8222
Technical support specialists are available to answer
questions from 8:00 A.M. to 5:00 P.M. PST, Monday
through Friday. Recordings are accessible 24 hours a
day, 7 days a week.
ST12450W/WD Installation Guide, Rev. B
11
SeaTDD: (408) 438-5382
TDD is a telecommunication device for the deaf where
two people can communicate using a keyboard that is
connectedtothephoneline. ATDDdeviceisrequiredto
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 commu-
nications software must be set for eight data bits, no
parity, and one stop bit (8N1), 9600 baud max.
With this service you can access:
• Specifications and jumper configurations
• Reprints of Seagate documentation
• Utilities that you can download to your own computer
Location
Modem number
USA, Mexico, Latin America
England
Germany
Singapore
Australia
(408) 438-8771
44-62-847-8011
49-89-140-9331
65-292-6973
61-2-756-2359
(416) 856-5581
33-1-40 67 10 34
82-2-556-7294
Canada
France
Korea
12
ST12450W/WD Installation Guide, Rev. B
General description
Barracuda 2, 2HP SCSI disc drives are high-speed,
random-access data storage devices. Two-head par-
allel technology effectively doubles the internal data
transfer rate when compared to non-parallel head
technologies.
ST12450W/WD drives are illustrated in Figure 1. Speci-
fications and DC power requirements for the drives 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,thediscdrivemustreceiveadequatecooling(refer
to “Providing adequate cooling”) and it must be suffi-
ciently grounded and shielded from emissions. The
Barracuda 2, 2HP Product Manual (part number
83328900) contains guidelinesforaproperlydesigned
enclosure.
ST12450W/WD Installation Guide, Rev. B
13
SCSI I/O
Connector
J01
J5
J4
DC Power
Connector
Figure 1. Barracuda 2, 2HP disc drive
14
ST12450W/WD Installation Guide, Rev. B
Characteristics
ST12450W/WD
Interface
Fast & Wide SCSI-21
Cache type
Multi-segmented
1,024 Kbytes
Capacity
Unformatted
Formatted2
2,437 Mbytes
1,849 Mbytes
Recording
Cylinders (user accessible)
Heads (physical)
Heads (logical)
Modulation
2,710
18
9
RLL 1,7 code
SCSI rate
Max burst transfer
20 Mbytes/sec
Seek time3
Average read
Average write
8.0 msec
9.0 msec
Disc rotation
RPM
7,200
Average latency
4.17 msec
1Can also be operated according to SCSI-1 protocol.
2Standard 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
3Not including on-board controller overhead.
ST12450W/WD Installation Guide, Rev. B
15
DC power requirements
Single-ended Differential
+5V +12V
+5V +12V
Voltage regulation5
± 5% ± 5%2 ± 5% ± 5%2
Amps
Maximum operating current1 1.32 0.91
1.65 0.91
Maximum starting current
Peak DC3, 6
Peak AC3
1.3
–
2.18
3.1
1.43 2.18
–
3.1
Delayed motor start (max)4
1.25 1.5
1.31 1.5
Peak operating current
Typ DC1,10
1.3
1.32 0.91
0.84
1.6
1.65 0.91
0.84
Max DC1
Max (peak)
1.4
1.85
2.4
1.85
Track following (DC)
at OD1
1.3
1.3
0.78
0.82
1.4
1.4
1.85
0.78
at ID1
Read track
OD DC1, 13
AC
1.4
1.5
0.81
1.16
1.9
2.5
0.81
1.16
Seeking
Typical DC1, 12
Maximum DC1
Maximum (peak) AC
1.3
1.3
1.3
1.06
1.14
1.85
1.4
1.44 1.14
2.2 1.85
1.06
1 Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.
16
ST12450W/WD Installation Guide, Rev. B
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 Barracuda 2, 2HP
Product Manual (publication number 83328900).
4 This condition occurs when the Motor Start option is en-
abled and the drive has not yet received a Start Motor
command.
5 See “Conducted noise immunity” in the Barracuda 2, 2HP
Product Manual. The specified voltage tolerance is inclu-
sive 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 3% 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 require-
ments.Wheremultipleunitsarepoweredonsimultaneously,
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 for
ST12450WD models and every 0.075 seconds for
ST12450W models.
ST12450W/WD Installation Guide, Rev. B
17
11 No terminator power. See Section 11.7.3.4 in the Barra-
cuda 2, 2HP Product Manual.
12 Seeking is defined as a third-stroke seek at OD. The
command is issued every 20 msec.
13 Read track is defined as repeat reads of track 15 with a
60% duty cycle.
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
• Synchronizingspindlesinmultiple-driveconfigurations
(optional)
• Providing adequate cooling
• Mounting the drive and connecting cables
• Formatting the drive
Severalillustrationsareprovidedtomaketheinstallation
process easy.
Writedowntheoriginaljumpersettingsbeforeyoumake
any changes. This makes it easy to revert to the original
configuration if necessary.
18
ST12450W/WD Installation Guide, Rev. B
Setting the SCSI ID jumpers
EachdeviceontheSCSIchainmusthaveauniqueSCSI
ID. The host system’s SCSI controller usually uses the
highest-numbered ID available (ID15 in wide systems);
therefore the lower-numbered SCSI IDs are normally
used for the other SCSI devices such as thisBarracuda
disc drive.
Note. MostSCSIcontrollers(hostadapters)allowyouto
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 re-
quirements for proper SCSI device installation.
Use connector J5 to set the SCSI ID (Figure 2). Most
Barracuda 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 illustration.
If, after completing the installation process, the drive’s
LEDdoesnotshowon/offactivitywhenthehostistrying
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.
Also check your system or controller user’s manual to
ensurethatyouhavenotviolateditsSCSIIDnumbering
recommendations.
ST12450W/WD Installation Guide, Rev. B
19
SCSI I/O
Connector
DC Power
Connector
Pin 1
Pin 1
J5
4P
3P 2P
1P
ID3 ID1
ID2 ID0
J5
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
Figure 2. Setting the SCSI ID
20
ST12450W/WD Installation Guide, Rev. B
Terminating the drive
If you are installing aBarracuda2, 2HPdriveinasystem
thathasotherSCSIdevicesinstalled, terminateonlythe
end devices on the SCSI chain. A SCSI “device” is any
disc drive, scanner, tape-backup unit, or other piece of
hardwareconnectedtoyoursystemusingtheSCSIbus.
The top example in Figure 3 shows an internal hard disc
atoneendoftheSCSIbuswiththeSCSIcontrolleratthe
other end (both are terminated). The bottom example
shows two additional SCSI devices connected exter-
nally—thismeanstheSCSIcontrollerisnolongeronthe
end of the SCSI chain and should not be terminated.
Internal SCSI cable
Internal
Internal
Controller
SCSI device SCSI device
Terminate
Internal SCSI cable
External
SCSI
cable
Internal
Internal
SCSI device SCSI device
External
External
Controller
SCSI device SCSI device
Terminate
Figure 3. SCSI bus termination
ST12450W/WD Installation Guide, Rev. B
21
ST12450W (single-ended) drives are terminated with
permanentlymountedactiveICterminators.Ifyouinstall
an ST12450W drive and it is not on the end of the
SCSI bus, remove the jumper from pins 11 and 12 of
connector J4 (see Figure 4).This disables the termina-
tors on thedrive.IfyouinstallanST12450Wdriveonthe
end of the SCSI bus, ensure that a jumper is installed on
pins 11 and 12 of connector J4.
Note. Use active t erminators when terminating the bus.
ST12450WD (differential) drives do not have internal
terminators or any other way of adding internal termina-
tion to the drive. You must provide external termination
to these drives when termination is required.
Pin 1
J01
J4
Power
Connector
J4
Pin 1
Drive Termination Options
Disable drive terminators.
Enable drive terminators.*
* Valid for single-ended drives only.
Figure 4. Terminating ST12450W drives
22
ST12450W/WD Installation Guide, Rev. B
Terminator power
ST12450W drives may be configured in four different
ways (see Figure 5); however,you usually will not need
to change this option and should normally leave the
drive configured as it was shipped from the factory.
ST12450WDdrives shouldbe configuredwith ajumper
connecting J01pins1and 3(and nojumper on J01pins
2 and 4) as illustrated in Figure 5.
J01
J4
Power
Connector
Pin 1
Pin 3
J01
Pin 1
Pin 2
*
*
Term. power from drive.
Term. power from SCSI bus.
Term. power to SCSI bus.
*
Term. power to SCSI bus and drive.
* Valid for single-ended drives only.
Figure 5. Setting terminator power jumpers
ST12450W/WD Installation Guide, Rev. B
23
Changing other applicable jumper options
Barracuda2,2HPdrivesaredesignedforuseinavariety
of systems. Unique installations may require you to
changeoneormoreoftheotherjumperstomeetspecific
system requirements; however, in most cases, you will
notneedtochangeanyofthesejumpersfornormaldrive
operation. Figures 6a and 6b provide the information
necessary to configure all jumpers not discussed else-
where in this manual.
Pin 1
J5
J5
Remote LED Connector*
Pin 9 (top pin) is negative (cathode),
Pin 10 (bottom pin) is positive (anode).
*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.
Figure 6a. Additional jumper options
24
ST12450W/WD Installation Guide, Rev. B
J4
Pin 1
J01
RES EDT PAR DMS
RES RES MTR WP
J4
Reserved (RES)
Reserved for future use.
Parity Check option (PAR)
Enable parity check of SCSI bus data.
Disable parity check of SCSI bus data (default).
Motor Start option (MTR)
Enable motor start. This makes the drive wait for
the Start Unit command from the host before starting
the spindle motor.
Disable motor start. This causes the drive to start
according to the Delay Motor Start option setting
as described below (default).
Delay Motor Start option (DMS)
(valid only if the Motor Start option is disabled)
Motor start delay equal to the SCSI ID multiplied
by 10 seconds , plus 3 additional seconds max.
For example, if the SCSI ID = 2, the drive will delay
for 23 seconds before starting.
Disable the delay motor start option (default).
Write Protect option (WP)
Write Protect = On (disables writing).
Write Protect = Off (enables writing – default).
Figure 6b. Additional jumper options
ST12450W/WD Installation Guide, Rev. B
25
Synchronizing spindles
in multiple drive configurations
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.
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 7.
SCSI I/O
Connector
DC Power
Connector
Pin 1
J5
SSC
Spindle Sync Cable Connector (SSC)
These pins are used to connect a
spindle sync cable.
J5
Spindle sync reference index signal
(REFSIG+).
Ground (GND).
Figure 7. Spindle sync jumpers and connectors
26
ST12450W/WD Installation Guide, Rev. B
Figure 8 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.
Sync Interface
Master Sync
Source
J5
11
Spindle
Control
Host
(or other drive)
12
+5V
R
T
Drive 1
J5
11
System
Interface
Spindle
Control
12
+5V
R
T
Drive 2
J5
11
Spindle
Control
12
+5V
R
T
Drive n
Figure 8. Spindle sync diagram
ST12450W/WD Installation Guide, Rev. B
27
Providing adequate cooling
The enclosure design must ensure adequate cooling
for the drive. The maximum ambient temperature is
50oC.
Thedrive’s product manual(83328900) describes how
to evaluatethe air-flow design.The evaluation consists
ofensuringthatthecasetemperaturesofcertaincritical
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 thehead and disc assembly(HDA).
Also,choosetheshortest possible pathbetweentheair
inlet and exit. This minimizes the distance traveled by
air that is heated by the drive and by other nearby heat
sources.
Figure 9 shows two design approaches with one or
more fans used to generate air flow. The air-flow pat-
terns 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.
28
ST12450W/WD Installation Guide, Rev. B
Kühlung des Systems
Die Gehäusekonstruktion muß eine ausreichende
Kühlung des Laufwerkes gewährleisten. Die
Umgebungstemperatur darf maximal 50oC betragen.
Die Produkthandbuch Barracuda 2, 2HP (Dokument
83328900) enthalten Anweisungen zur Beurteilung der
Luftstromkonstruktion.DieBeurteilungmußsicherstellen,
daß sich die Gehäusetemperatur bestimmter kritischer
Komponenten bei Laufwerkbetrieb innerhalb
zugelassener Grenzen hält.
Wirempfehlen, dasLaufwerksozuorientierenoderden
Luftstrom so zu lenken, daß der geringste
Luftstromwiderstand erzeugt wird und gleichzeitig ein
Luftstrom über den Platinen und um die Kopf- und
Festplatteneinheit(HDA)gegebenist.WählenSieeinen
möglichstkurzenWegzwischenLufteinlaßund-auslaß.
Dadurch wird die Strecke, die die vom Laufwerk und
anderennahegelegenenHitzequellenaufgewärmteLuft
zurücklegt, auf ein Minimum beschränkt.
Abbildung 9 zeigt zwei Konstruktionsmöglichkeiten, bei
denen ein oder mehrere Lüfter den Luftstrom erzeugen.
DerLuftstromverlaufwirddurchdieLüftergesteuert, die
entweder Luft einblasen oder abziehen. Generell kann
der Luftstrom entweder von vorne nach hinten oder von
hinten nach vorne verlaufen.
ST12450W/WD Installation Guide, Rev. B
29
Above unit
Über der Einheit
Note. Air flows in the direction shown (back to front)
or in reverse direction (front to back)
Under unit
Unter der Einheit
Hinweis. Luftstrom in der angezeigten Richtung
(von vorne nach hinten) oder in umgekehrter
Richtung (von hinten nach vorne)
Above unit
Über der Einheit
Note. Air flows in the direction shown or
in reverse direction (side to side)
Under unit
Unter der Einheit
Hinweis. Luftstrom in der angezeigten Richtung oder in
umgekehrter Richtung (von Seite zu Seite)
Figure 9. Suggested air flow
Abbildung 9. Empfohlener Luftstromverlauf
30
ST12450W/WD Installation Guide, Rev. B
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 (horizon-
tally, 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 ex-
tend 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.
ST12450W/WD Installation Guide, Rev. B
31
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 (horizon-
tal, 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.
GemessenvonderAußenflächedesGehäusesdürfen
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.
32
ST12450W/WD Installation Guide, Rev. B
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 (see
Figures 2, 4, 5, and 6).
3. StellenSiesicher,daßdieKennungsbrückeninstalliert
sind. Siehe Abbildung 2, 4, 5, und 6.
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.
ThedrivereceivesDCpowerthrougha4-pinconnec-
tor mounted next to the SCSI connector. The output
of a power supply must meet SELV (safety extra low
voltage)asdefinedinIEC950.Figure10providesthe
pin information for the DC power connector. To con-
nect 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-SteckverbinderdesLaufwerkesan(wiebereits
inAbbildung1gezeigt). DasKabeldarfnichtgedehnt
ST12450W/WD Installation Guide, Rev. B
33
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.Abbildung10zeigtdieSteckerbelegung
für den Gleichstromanschluß. Zum Anschluß des
Gleichstromkabels an das Laufwerk das Kabelende
indenGleichstromanschlußdesLaufwerkesstecken.
Pin
1
Power
Pin Gleichstrom
+12V
1
2
3
4
+12 V
2
+12V return
+ 5V return
+ 5V
+12 V Rückleitung
+ 5 V Rückleitung
+ 5 V
3
4
4
3
2
1
Figure 10. DC power connector
Abbildung 10. Gleichstromanschluß
34
ST12450W/WD Installation Guide, Rev. B
Note. Signal ground on the power control board (PCB)
and the head and disc assembly (HDA) are con-
nected together in this drive and you cannot sepa-
rate them. The equipment in which you have
mountedthedriveisconnecteddirectlytotheHDA
andPCBwithoutelectricallyisolatingshockmounts.
Maximizing the conductive contact area between
HDA ground and system ground may reduce radi-
ated 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.Thismayincreaseradiatedemissionsand
is the system designer’s responsibility.
Hinweis:
DieSignalerdeaufderStromregelungskarte(PCB)
undderKopf-undFestplatteneinheit(HDA)sindin
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
ST12450W/WD Installation Guide, Rev. B
35
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.
36
ST12450W/WD Installation Guide, Rev. B
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 2, 2HP disc
driveisdesignedtooperatewithavarietyofoperating
systems; therefore, please refer to your system or
SCSI controller manuals for information about for-
matting and setting up the drive.
Seagate Technology, Inc.
920 Disc Drive, Scotts Valley, CA 95066-4544, USA
Publication Number: 83328890, Rev. B, Printed in USA
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