Seagate BARRACUDA2, 2HP ST12450W/WD User manual

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BARRACUDA 2, 2HP
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Disc Drive
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ST12450W/WD
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Installation Guide
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Contents
Preface .................................................................. 1
Electrostatic discharge protection........................... 1
Important safety information and precautions ......... 2
WichtigeSicherheitshinweise ............................... 5
Technical support services ..................................... 10
General description ................................................ 12
Initial setup information........................................... 17
Kühlung des Systems .......................................... 28
© 1995 Seagate Technology, Inc. All rights reserved
Publication Number: 83328890, Rev. B
March 1995
Seagate®,SeagateTechnology®,andtheSeagatelogo
are registered trademarks of Seagate Technology, Inc.
Barracuda™, SeaFAX™, SeaFONE™, SeaTDD™,
and SeaBOARD™ are trademarks of Seagate Tech-
nology,Inc.Otherproductnamesareregisteredtrade-
marks or trademarks of their owners.
No part of this publication may be reproduced in any
formwithoutwrittenpermissionfromSeagateTech-
nology, Inc.

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 thedirect 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
metalassembly.Asageneralrule,rememberthatyou
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
possibleriskofeachtechnique.Consequently,wehave
not completed any such broad evaluation. If you use a
non-approved procedure or tool, first ensure that the
methodyouchoosewillnotriskeitheryoursafetyorunit
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.
• Wearsafetyshoeswhenremovingorreplacingheavy
parts.

4 ST12450W/WD Installation Guide, Rev. B
• Ensure that the internal temperature of the rack or
cabinetdoesnotexceedthelimitsdefinedforthedrive
when the drive is mounted in an equipment rack or
cabinet.Whenunitsarestackedvertically,payspecial
attention to the top where temperatures are usually
highest.
• Follow the precautions listed above in “Electrostatic
discharge protection.”
• Donot removeany circuitboards fromthe drivechas-
sis.Returntheentiredrivefordepotrepairifanycircuit
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 astheBarracuda 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
complianceintheirend-useproductsandforcertifying
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
astand-aloneunit. Engineering radiatedemissionstest
resultsareavailablethroughtheSeagateSafetyDepart-
ment to assist the subsystem designer.
WichtigeSicherheitshinweise
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
WartungundReparaturderEinheit.EinigeVerfahren
erfordern Spezialwerkzeuge; diese müssen zur
sachgemäßenAusführungderWartungsarbeitenund
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 daßderen GebrauchmitRisiko behaftetist.
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
zuerstsicher,daßdasgewählteVerfahrenwederIhre

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
Einheitangemessene 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,dadortdieTemperaturgewöhnlicham
höchsten ist.

8 ST12450W/WD Installation Guide, Rev. B
• Befolgen Sie die oben unter “Electrostatic Discharge
Protection”angegebenenSicherheitsmaßnahmen.
• NehmenSiekeinePlatinenausdemLaufwerkgehäuse.
Wenn eine Platine defekt ist, muß das gesamte
Laufwerk zur Reparatur eingeschickt werden. Die
HerausnahmevonPlatinendurchanderePersonenals
diefürdiewerkseitigeReparaturzuständigen kann zu
einerBeschädigungderKomponentenundErlöschen
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.
AlsTeilkomponente istdieses Laufwerkfürdie 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.
DiesesGerätisteineBaugruppe und unterliegtals
solchenichtdenAnforderungenderFCCoderähnlicher
nationaler Behörden für eigenständige Geräte.
TechnischeTestergebnissezuelektromagnetische
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
installationtroubleshooting.Producttechnicalsupport
is available for all Seagate products by calling the
SeaFAX™,SeaFONE™,SeaTDD™,orSeaBOARD™
services. These are toll calls if you dial from outside of
the number’s local dialing area.
SeaFAX:
USA [phone]; England 44-62-847-7080
Youcanuseatouch-tonetelephonetoaccessSeagate’s
automated FAX delivery system and select technical
supportinformationbyreturnFAX.Thisserviceisavail-
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: [phone]
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: [phone]
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 8:00A.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 [phone]
England 44-62-847-8011
Germany 49-89-140-9331
Singapore 65-292-6973
Australia 61-2-756-2359
Canada [phone]
France 33-1-40 67 10 34
Korea 82-2-556-7294

12 ST12450W/WD Installation Guide, Rev. B
General description
Barracuda 2, 2HP SCSI disc drives are high-speed,
random-accessdata storagedevices. Two-headpar-
allel technology effectively doubles the internal data
transfer rate when compared to non-parallel head
technologies.
ST12450W/WDdrivesareillustratedinFigure1.Speci-
fications and DC power requirements for the drives are
listed in tables following the figure.
Thedriveisacomponentforinstallationinanenclosure
designed for the drive. This is often a rack within the
systemoranexternalenclosuredesigned to houseone
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)containsguidelinesforaproperlydesigned
enclosure.

SCSI I/O
Connector
DC Power
Connector
J4 J01
J5
Figure 1. Barracuda 2, 2HP disc drive
ST12450W/WD Installation Guide, Rev. B 13

14 ST12450W/WD Installation Guide, Rev. B
Characteristics ST12450W/WD
Interface Fast & Wide SCSI-21
Cache type
Multi-segmented 1,024 Kbytes
Capacity
Unformatted 2,437 Mbytes
Formatted21,849 Mbytes
Recording
Cylinders (user accessible) 2,710
Heads (physical) 18
Heads (logical) 9
Modulation RLL 1,7 code
SCSI rate
Max burst transfer 20 Mbytes/sec
Seek time3
Average read 8.0 msec
Average write 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 current11.32 0.91 1.65 0.91
Maximum starting current
Peak DC3, 61.3 2.18 1.43 2.18
Peak AC3– 3.1 – 3.1
Delayed motor start (max)41.25 1.5 1.31 1.5
Peak operating current
Typ DC1,10 1.3 0.84 1.6 0.84
Max DC11.32 0.91 1.65 0.91
Max (peak) 1.4 1.85 2.4 1.85
Track following (DC)
at OD11.3 0.78 1.4 1.85
at ID11.3 0.82 1.4 0.78
Read track
OD DC1, 13 1.4 0.81 1.9 0.81
AC 1.5 1.16 2.5 1.16
Seeking
Typical DC1, 12 1.3 1.06 1.4 1.06
Maximum DC11.3 1.14 1.44 1.14
Maximum (peak) AC 1.3 1.85 2.2 1.85
1Measured with an average reading DC ammeter. Instanta-
neous +12V current peaks will exceed these values.

16 ST12450W/WD Installation Guide, Rev. B
2A –10% tolerance is permissible during initial start of the
spindlebut mustreturn to±5%beforereaching 7,200RPM.
The±5%mustbemaintainedafterthedrivesignifiesthatits
power-up sequence has been completed and that the drive
is able to accept selection by the host initiator.
3See the +12V current profile in the
Barracuda 2, 2HP
Product Manual (publication number 83328900).
4This condition occurs when the Motor Start option is en-
abled and the drive has not yet received a Start Motor
command.
5See “Conducted noise immunity” in the
Barracuda 2, 2HP
Product Manual. The specified voltage tolerance is inclu-
sive of ripple, noise, and transient response.
6At 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.
7Minimumcurrent loading for eachsupply voltage isnotless
than 3% of the maximum operating current shown.
8Use separate ground returns for +5 and +12V supplies.
9Where power is provided to multiple drives from a common
supply, carefully consider individual-drive power require-
ments.Wheremultipleunitsarepoweredonsimultaneously,
besurethepeakstartingcurrentisavailabletoeachdevice.
10 Operating condition is a third-stroke seek at OD and Read
OneTrack.Thecommand is issued every 0.07 seconds for
ST12450WD models and every 0.075 seconds for
ST12450W models.

ST12450W/WD Installation Guide, Rev. B 17
11No terminator power. See Section 11.7.3.4 in the
Barra-
cuda 2, 2HP Product Manual.
12Seeking is defined as a third-stroke seek at OD. The
command is issued every 20 msec.
13Read track is defined as repeat reads of track 15 with a
60% duty cycle.
Initial setup information
Thefollowingtopicsarepresentedtoguideyouthrough
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
anychanges.Thismakesiteasy to revertto 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
usedfor the otherSCSIdevices suchasthisBarracuda
disc drive.
Note. MostSCSIcontrollers(hostadapters)allowyouto
skip a SCSI ID. For example, you can have ID0,
ID1, and ID3 (skipping ID2). Other controllers do
notallowthissobesuretorefertoyoursystemor
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
tocommunicatewiththe drive,aduplicateSCSIIDmay
bethe problem.Ifthis isthe case, changethe ID sothat
each device on the SCSI chain has its own unique ID.
Also check your system or controller user’s manual to
ensurethatyouhavenotviolateditsSCSIIDnumbering
recommendations.